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Journal Cover Journal of Material Cycles and Waste Management
  [SJR: 0.449]   [H-I: 22]   [3 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1611-8227 - ISSN (Online) 1438-4957
   Published by Springer-Verlag Homepage  [2335 journals]
  • Synthesis and characterization of zeolites NaA and NaX from coal gangue
    • Authors: Jianlong Chen; Xinwei Lu
      Abstract: Zeolites NaA and NaX were synthesized from initial coal gangue (milled sample) and pretreated coal gangue (calcinated and acid immersed sample) by an alkali fusion method prior to hydrothermal treatment, which started by mixing NaOH with coal gangue at an optimal weight ratio of nearly 1.2:1. Results show that zeolite NaA was successfully synthesized by alkali fusion at 650 and 950 °C from initial coal gangue, while zeolite NaX was synthesized by alkali fusion at 600 °C from pretreated coal gangue. Zeolites NaX with different specific surface area, external surface area, surface area of micropore and crystallinity were synthesized when the molar ratio of SiO2/Al2O3 in raw materials ranges from 3.46 to 10.0.
      PubDate: 2017-03-17
      DOI: 10.1007/s10163-017-0605-5
  • Effect of ultrasonic pretreatment on secondary sludge and anaerobic
           biomass to enhance biogas production
    • Authors: Palanisamy Divyalakshmi; Devaraj Murugan; Meenatchisundaram Sivarajan; Arumugam Sivasamy; Palanivel Saravanan; Chockalingam Lajapathi Rai
      Abstract: Anaerobic digestion studies were carried out with tannery excess secondary sludge obtained from common effluent treatment plant. The excess sludge as a feed was disintegrated by ultrasonic homogenizer, to solubilize the intracellular compounds to overcome the rate-limiting hydrolysis step. The anaerobic biomass was subjected to diligent disintegration with the aim of increasing the maintenance energy requirements thereby enhancing its microbial activity. To achieve maximum gas production, the percentage treatment volume of feed and biomass were chosen as dynamic variables and the optimization of these variables was carried out by RSM technique. A 22 full factorial central composite design was used for experimental design and analysis. It was observed that the percentage treatment volume of biomass was found to be most significant variable that of feed and the interaction effects of these two variables found to be insignificant. Based on experimental results, quadratic model was arrived and the variables were optimized for maximum gas production. In addition, response surface for maximum gas production was obtained as a function of two dynamic variables for identification. In the present study, the influence of pretreatment was observed only in biogas production and COD removal, but the methane content remains unchanged.
      PubDate: 2017-03-17
      DOI: 10.1007/s10163-017-0603-7
  • Classification and management of kitchen waste: disposals and proposals in
           Chaoyang district, Beijing, China
    • Authors: Yaya Wang; Bing Zang; Yu Liu; Guoxue Li
      Abstract: The KW from Chaoyang District was mainly treated by incineration at present. The main purpose of this study was to analysis whether the properties of kitchen waste (KW) in Chaoyang District, Beijing were appropriate for anaerobic digestion (AD). The KW was obtained from four typical closed cleaning stations by sampling once per quarter. The results showed the classification of four different typical closed cleaning station based on living standard was around 90% with good classification levels except Erdaogou and all featured with high vegetables and peels contents. Variable pH with different typical closed cleaning station and sampling season and was suitable for AD other than composting. The high moisture content (MC) was also not suitable for composting. The indices of C/N ratio (basically ranged in 15–20), EC, and NH4 +–N content were measured and showed the KW could be treated by AD. The properties of KW vary with living standard and seasons. The properties of KW sampled in the same season, but closed cleaning station were different with each other and also sampled in the same closed cleaning station but different seasons varied widely. Finally, (Guoxue Li) considering the particular nature of KW, AD was better disposal than composting for treating KW in Chaoyang District.
      PubDate: 2017-03-16
      DOI: 10.1007/s10163-017-0602-8
  • Centrifugal dewatering of blended sludge from drinking water treatment
           plant and wastewater treatment plant
    • Authors: Ailan Yan; Jun Li; Liu Liu; Ting Ma; Jun Liu; Yongjiong Ni
      Abstract: The blended sludge taken from drinking water treatment plant (WTP) and wastewater treatment plant (WWTP) for centrifugal dewatering was proposed. Residual products of polyaluminum chloride and inorganic particles in alum sludge from WTP were considered to improve dewaterability of sewage sludge from WWTP through the charge neutralization, adsorption bridging, squeezing, and skeleton builders. The sludge with blend ratio of 1:1 and no PAM addition, the specific resistance to filtration was 1.27 × 1013 m/kg, the moisture content was 62% after centrifugal dewatering, and more excellent dewatering performance of blended sludge was proved. Scanning electron microscope showed that the surface of blended sludge had more rough and porosity structure than the sewage sludge. EDS analysis showed that residual alum and inorganic particles existed in blended sludge. 3D-Excitation-emission matrix was used to analyze change of protein-like of sewage sludge and blended sludge with dewatering process. The results implied that alum sludge acted as chemical conditioner and physical conditioner in blended sludge. A hypothesis was suggested to describe the centrifugal dewatering process of blended sludge. The final disposal options of the blended sludge would be landfilling and building material utilization.
      PubDate: 2017-03-16
      DOI: 10.1007/s10163-017-0597-1
  • Numerical study of heat transfer characteristics of char from waste tire
    • Authors: Hoon Chae Park; Hang Seok Choi; Yeon-Ho Kwak
      Abstract: To investigate heat transfer of char from waste tire pyrolysis, the cooling of char was simulated by the computational fluid dynamics. To scrutinize the heat transfer characteristics, bed height, temperature of cooling wall, and mixing time were selected as calculation parameters. From the results, increasing the char bed height from 0.005 to 0.02 m, the total heat transfer is decreased as from 45.5 to 26.5 J. As the char bed height is further increased from 0.02 to 0.06 m, the total heat transfer is decreased from 26.5 to 9.1 J. The char bed height affects the total heat transfer significantly. The total heat transfer decreases from 15.9 to 14.0 J as the temperature of cooling wall increases from 273.15 to 323.15 K. The total heat transfer mildly depends on the temperature of cooling wall. The particle mixing time increases from 10 to 120 s and the total heat transfer decreases from 28.6 to 22.6 J. It is noted that the particle contact is enhanced between char particles as well as the particles and cooling wall as the particle mixing time decreases. Consequently, heat transfer is augmented.
      PubDate: 2017-03-15
      DOI: 10.1007/s10163-017-0598-0
  • Recovery of ammonium ion as struvite from flue gas scrubbing wastewater
    • Authors: Shanti Thapa; Tae Young Ha; Heonsuk Lee; Adedeji A. Adelodun; Jo Young Min
      Abstract: Direct disposal of flue gas scrubbing-derived waste water with a high level (9000–10,000 mg/L) of ammonium ion (NH4 +) into aquatic systems has contributed to environmental depreciation. Here, we report a feasibility study on NH4 + recovery and conversion to struvite (NH4MgPO4·6H2O), which is a slow-release fertilizer. Such conversion also aids in compliance with the discharge limits for nitrogen-based compounds. Lab-scale experiments were performed to determine the optimum pH and molar ratio (Mg2+:NH4 +:PO4 3−) for struvite formation. A chemical equilibrium model (Visual Minteq) was also employed to corroborate the experimental results. The optimum pH for struvite precipitation was found to be pH 9 with a molar ratio of Mg2+:NH4 +:PO4³− = 1:1:1. At this pH, more than 93, 92.3 and 100% of the NH4 +, Mg2+ and PO4 3−, respectively, were removed from the scrubbing waste water Visual Minteq simulation also demonstrated optimum struvite formation at pH 9–10. Both X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) analysis revealed that the synthesized struvite was comparable to that of a commercial struvite. Thus, our findings confirmed the possibility of synthesizing struvite from de-NOx scrubbing wastewater utilizing the residual ammonium ions (NH4 +).
      PubDate: 2017-03-11
      DOI: 10.1007/s10163-016-0579-8
  • The choice of system boundaries for effective long-term management of
    • Authors: Demet Seyhan; Paul H. Brunner
      Abstract: Material flow analysis (MFA) is a well-established tool for supporting decisions on nutrient management. This paper shows the importance of the system boundary chosen when an MFA system is established. To reach this goal, data of existing regional and global phosphorous studies was investigated in view of phosphorous-flows (P-flows) and stocks within and outside the systems observed. Then, internal flows and stocks to be managed are juxtaposed with upstream flows and stocks beyond the system boundaries. The results show that narrow system boundaries yield useful findings to improve regional P management on the short term. If, however, regional and global P-availability is to be secured for longer time periods, system boundaries must include the use and losses of P in the so-called ‘Hinterland’, defined as “the total amount of P used and lost abroad for the production of all goods imported into a country”. In some cases, these Hinterland flows appear to be dominant, jeopardizing measures to manage P in a cost effective, resource conserving, and environmentally sound regional way. Hence, the choice of system boundaries is crucial for MFA research. In particular, the huge losses of P in the global agriculture, as well as the magnitude of mining wastes must be considered for effective decisions regarding P management. Taking the Hinterland into account by linking global and regional P flows and stocks is mandatory if priorities for P management are defined.
      PubDate: 2017-03-08
      DOI: 10.1007/s10163-017-0589-1
  • A comparative study on characteristic of locally source-separated and
           mixed MSW in Bangkok with possibility of material recycling
    • Authors: Chinnathan Areeprasert; Jeerattikul Kaharn; Bundit Inseemeesak; Phatavee Phasee; Chanoknunt Khaobang; Apichaya Kuhavichanun; Patcharanan Theerarojprateep; Wichai Siwakosit
      Abstract: To quantitatively emphasize the importance of source separation practice, the difference on the MSW composition of the two areas in Bangkok, namely the community with locally source separated of MSW and the Bangkok’s waste transfer center, was comparatively studied. The possibility of material recycling was discussed based on the observed MSW’s data. Results showed that waste generation per capita at the community was significantly lower (39%) than the official reported value due to source separation practice. The portion of plastic waste at transfer station was 60 and 90% higher than that of the community (where source separation activity has been performed) for weekday and weekend, respectively, while the paper waste of NKC was 147 and 211% higher than that of the community for weekday and weekend, respectively. Potential for plastic and paper recycling was 250 and 150 g per day per capita, respectively, and their potential on economic values were 0.33 and 0.18 baht/person/day, respectively.
      PubDate: 2017-03-03
      DOI: 10.1007/s10163-017-0583-7
  • Analyzing material flow in Alborz industrial estate, Ghazvin, Iran
    • Authors: Hossein Vahidi; Hassan Hoveidi; Javad Kazemzadeh Khoie; Hossein Nematollahi; Ramezan Heydari
      Abstract: Industrial ecology and models such as material flow analysis make operational approaches in order to reuse produced waste as primary resources in other industrial units. In this study, using these concepts and the material flow model, the waste flow network between some of the units in Ghazvin industrial estate have been analyzed. 38 industrial units from the total 220 active units in the estate were visited and quantitative and qualitative information regarding the production process of the plant, waste production, and primary resource consumption was collected. According to the flow model being considered at the estate, a trade plan for 6 types of waste in the estate was presented. In total, 341.6 tons which equals 38% of the produced waste in these industrial units is reusable in this complex. To follow economic analysis in the raw waste, economic value stage was carried out which lead to a 1.43 million US dollar annual income and 256 thousand dollar saving in the loading and transport area. Finally, topics such as database, clustering, and location of industry in this estate were analyzed and discussed based on industrial ecology concepts.
      PubDate: 2017-03-03
      DOI: 10.1007/s10163-017-0601-9
  • Evaluation by year of the valuable/hazardous material content of
           lithium-ion secondary battery cells and other components of notebook
           computer battery packs
    • Authors: Shunsuke Kuzuhara; Yuta Akimoto; Kazu Shibata; Masahiro Oguchi; Atsushi Terazono
      Abstract: Our objective was to provide the information necessary to efficiently recover metals from end-of-life lithium-ion secondary batteries by assessing the metal content by year of production. In addition, we analyzed the concentrations of Sn and the toxic metals Pb, Cr, and Cd in battery pack components, including printed circuit boards and cables. Li and Co were the only active substances in the cathode materials of lithium-ion secondary batteries produced from 1997 to 2005. Ni and Mn also were used in cathode materials of batteries produced from 2007 to 2011. However, Ni became the main constituent in 2012, and Mn was not detected in batteries from that year. For printed circuit boards and cables, Pb concentrations from 1997 to 2004 ranged from 6451 to 12,107 mg/kg, but from 2005 onward maximum concentrations were 513 mg/kg, clearly showing that substitution for Pb had been completed a year before the EU Restriction on Hazardous Substances (RoHS) Directive came into effect.
      PubDate: 2017-03-02
      DOI: 10.1007/s10163-017-0600-x
  • Potential resources of post-consumer wood waste in Poland
    • Authors: Ewa Ratajczak; Aleksandra Szostak; Gabriela Bidzińska; Magdalena Herbeć
      Abstract: This article presents the results of studies, whose aim was to determine the volume of post-consumer wood waste resources in Poland and propose a calculation method. The methodical approach applied is based on the concept of life cycle of final wood products, including a system of indices describing rotation of these products and their average useful life. The study revealed that in 2013 potential amount of post-consumer wood waste in Poland was 6.5 million m3, which was 17% of wood removals and approximately 19% of consumption (the amount of processed wood originating from Polish forests). The post-consumer wood resources were composed of waste from worn-out final wood products predominantly made of: sawnwood (approximately 83%), wood-based materials (9%), and roundwood (8%). This waste can potentially be created in many sectors of the economy, while construction is the primary producer (64% of the hypothetical volume of post-consumer wood waste resources). When considered by product types, the largest base of post-consumer wood waste consisted of worn-out wooden windows and doors (15%).
      PubDate: 2017-03-02
      DOI: 10.1007/s10163-017-0593-5
  • Identification of microbial populations contributing to
           nitrification-associated nitrous oxide emission during cattle manure
           composting process with forced aeration
    • Authors: Daisuke Inoue; Kazuko Sawada; Hirofumi Tsutsui; Taku Fujiwara
      Abstract: This study was conducted to clarify the fates of whole nitrogen cycle-associated microorganisms during laboratory-scale composting of cattle manure with continuous forced aeration, with the primary goal of identifying microbial populations that contributed greatly to high nitrous oxide (N2O) emissions triggered by nitrification. DNA microarray analysis targeting functional genes associated with the entire microbial nitrogen cycle was applied for the first time to investigate the fates of entire nitrogen cycle-associated microbial community during composting, and revealed increased diversity of nitrogen cycle-associated microorganisms, including ammonia-oxidizing populations, during active nitrification and N2O emission periods. Further analyses of the compositions of ammonia-oxidizing populations by DNA microarray, PCR-denaturing gradient gel electrophoresis and clone library methods revealed that Nitrosomonas europaea, Nitrosomonas eutropha, and their relatives were the dominant ammonia-oxidizing populations. Overall, the analyses of entire nitrogen cycle-associated microbial community and specific functional groups by a combination of different molecular biological methods in this study could confirm that N. europaea/eutropha and their relatives contributed greatly to high N2O emissions via active nitrification during cattle manure composting with forced aeration.
      PubDate: 2017-03-01
      DOI: 10.1007/s10163-017-0588-2
  • Heat-treatment recycling of waste toner and its applications in lithium
           ion batteries
    • Authors: Yang Li; Jiqing Mao; Huaqing Xie; Jing Li
      Abstract: With the growing demand of print and copy in modern society, the number of abandoned toner cartridges has increased year by year. Unfortunately, the residual toner in abandoned toner cartridges is not all disposed properly and such unreasonable discard is serious damage to the environment and human health. Therefore, it is urgent and necessary to carefully dispose waste toner or even recycle them. In this work, waste toner is dealt with heat treatment (400, 600, and 800 °C) to obtain carbon-coated ferric oxides, which subsequently are investigated on the structures, morphologies, and electrochemical performances as active materials for lithium ion battery. In constant current charge and discharge measurements, the results show that the discharge-specific capacities of heat-treated ferric oxides reach to 966, 1029, and 1021 mAhg−1, respectively, in the first cycle. After 50th cycles, the discharge-specific capacity of the samples can, respectively, remain 288, 349, and 245 mAhg−1 in voltage range of 0.02–1.5 V, under the current density of 40 mAg−1, which demonstrates stable cycling performance and suggests potentiality of recycled waste toner as anode materials for lithium ion batteries.
      PubDate: 2017-02-28
      DOI: 10.1007/s10163-017-0599-z
  • Thermodynamic analysis of metals recycling out of waste printed circuit
           board through secondary copper smelting
    • Authors: Maryam Ghodrat; Muhammad Akbar Rhamdhani; Abdul Khaliq; Geoffrey Brooks; Bijan Samali
      Abstract: In this paper, a detailed thermodynamic analysis of processing of electronic waste (e-waste), particularly printed circuit boards (PCB), through secondary copper recycling (black copper smelting), was carried out. The mass balance flowsheets of two scenarios, i.e., the case of secondary copper recycling with (SCE1) and without (SCE2) addition of PCBs, have been developed and compared. From the perspective of recovery of copper (Cu), gold (Au), and silver (Ag); the thermodynamic analysis predicted that the process conditions at temperature of 1300 °C and oxygen partial pressure (pO2) of 10–8 atm are suitable for PCB processing through secondary copper smelting route. Under these conditions, no solid phases were predicted to form when the PCB addition is below 50 wt%. High PCB addition was predicted to produce high volume of slag in the process and more pollutants in the gas phase (Br-based gaseous compounds). The chemistry of the slag was also predicted to change that is shifting the liquidus temperature to a higher value due to the presence of aluminium (Al), silica (SiO2), and titanium dioxide (TiO2) in the feed coming from the PCB. The carbon content of the PCB potentially supplies additional heat and reductant (CO) in the process hence can partially replace coke in the feed material. The predicted recoveries of copper (Cu), gold (Au), and silver (Ag) from e-waste were 83.3, 96.5, and 88.5 wt% respectively.
      PubDate: 2017-02-24
      DOI: 10.1007/s10163-017-0590-8
  • Survey on readability of online information for upgrading
           understandability of biomass energy technology
    • Authors: Muhammad Kunta Biddinika; Ahmad Muhammad Diponegoro; Raden Muhammad Ali; Raden Ibnu Rosyadi; Koji Tokimatsu; Fumitake Takahashi
      Abstract: Waste management contributes to renewable energy such as biodiesel production from processes of various types of biomass including vegetable oils, animal fats, and waste of edible oil. Successful waste management effort is influenced by people concern about benefit of waste management including for renewable energy from biomass. It involves their understanding initiated by literacy on biomass energy. To help increase literacy on waste recycle and biomass energy technology, we study readability of online information regarding biomass energy in Indonesian language (Bahasa Indonesia). Indonesia is considered as one of biomass-rich country with a little utilization for energy. The readability is studied by combining two approaches: measurement by readability standard and survey on readability confirming measurement by the standard. This study focuses on the confirmation survey readability standard measured on biomass online information in Indonesian language. In the survey, 19 online text materials were read by respondents and they were asked to give their impression whether the texts are easy or difficult to understand. From this study, what factors influence understandability of text information are shown. The results could be a guidance for preparing text information to raise people concern on waste recycle and renewable energy in general.
      PubDate: 2017-02-23
      DOI: 10.1007/s10163-017-0596-2
  • Simultaneous removal of SO 2 and PAHs by adding calcium-based additives
           during sewage sludge incineration in a fluidized bed incinerator
    • Authors: Lin-Bo Qin; Jun Han; Wang-Sheng Chen; Ge-Ge Wang; Guang-Qian Luo; Hong Yao
      Abstract: In this paper, the simultaneous removal of sulfur dioxide (SO2) and polycyclic aromatic hydrocarbons (PAHs) by adding calcium-based additives [CaO, Ca(OH)2, and CaCO3] during sewage sludge incineration was investigated in a fluidized bed incinerator. The effects of the types, CaO/S (mole ratio) and particle size of calcium-based additives on PAHs or PAHs Toxic Equivalent Quantity concentrations (TEQs) were also considered. The experimental results indicated that CaO had a better performance of reducing SO2 and PAHs emission, and the removal efficiencies of SO2, PAHs and PAHs TEQs at 850 °C were 86.89, 38.88 and 75.19%, respectively. Meanwhile, the increase of CaO/S and decrease of particle size were beneficial for suppressing PAHs formation and capturing SO2. Moreover, the adsorption and catalytic effect of calcium-based additives were regarded as inhibiting PAHs formation.
      PubDate: 2017-02-22
      DOI: 10.1007/s10163-017-0592-6
  • Degradation of pet copolyesters under real and laboratory composting
    • Authors: Magdalena Vaverková; Dana Adamcová; Lenka Kotrchová; Jan Merna; Soňa Hermanová
      Abstract: The present work is aimed on the study of degradation of poly(ethylene terephthalate-co-lactate) copolyesters, prepared by chemical modification of PET waste beverage bottles using l-lactic acid, under laboratory (bioreactor) and natural (Central Composting Plant in Brno, Czech Republic) composting conditions. The structure of solid residues after degradation was analyzed by IR, NMR, thermogravimetric (TGA) methods, and size exclusion chromatography in chloroform and the residues rich on aromatic units were analyzed in CHCl3/HFIP solutions. Sample with 57 mol% of aliphatic units showed the highest degree of degradation with mass loss of about 90% independently of composting conditions. The samples with 57 and 60 mol% of aromatic units reached 68 and 51% degradation in the compost pile and only 39 and 5% in laboratory bioreactor. Gravimetric analysis along with molar mass distribution measurement showed that laboratory-level composting study provides more consistent and defined results. However, it should be accompanied with tests performed under real conditions for the purpose of biodegradability evaluation of polymeric materials with varying composition.
      PubDate: 2017-02-22
      DOI: 10.1007/s10163-017-0595-3
  • Development of combined plant of biogas and bio solid-refuse-fuel from
           swine manure slurry
    • Authors: Yeon Seok Choi; Sang Kyu Choi; Seock Joon Kim; So Young Han; Du Su Jung; Tae Han Yoon; Ramesh Soysa
      Abstract: An environment-friendly treatment of organic waste like swine manure and food waste is considered to be big challenge, because the residue of organic wastes after anaerobic digestion contains still high amount of undigested organics and is not allowed to dump to ocean by international regulation. The residue from anaerobic digestion of organic wastes, on the other side, has high energy potential because of its leftover organics. In this study a new and integrated treatment process plant of 40 ton swine manure with 20 ton food waste a day has been developed to achieve environment-friendly disposal of swine manure and to produce renewable solid fuel, which has combined two processes of biogas plant and bio solid-refuse-fuel plant. The residue of anaerobic digestion from biogas plant was conveyed to the bio solid-refuse-fuel plant and dried in dryer using the biogas produced in biogas plant as a burner fuel and finally pelletized for a renewable solid fuel. About 30% of total biogas was supplied for 8 h operation of dryer and the leftover 70% was used for generating electricity in the 250 kW gas engine power generator. The produced pellet was analyzed to have good fuel property that meets the Korea Bio Solid-Refuse-Fuel Quality Standard.
      PubDate: 2017-02-21
      DOI: 10.1007/s10163-017-0594-4
  • Waste prevention for sustainable resource and waste management
    • Authors: Shin-ichi Sakai; Junya Yano; Yasuhiro Hirai; Misuzu Asari; Ritsuki Yanagawa; Takeshi Matsuda; Hideto Yoshida; Tetsuji Yamada; Natsuko Kajiwara; Go Suzuki; Tatsuya Kunisue; Shin Takahashi; Keijiro Tomoda; Joachim Wuttke; Paul Mählitz; Vera Susanne Rotter; Mario Grosso; Thomas Fruergaard Astrup; Julian Cleary; Gil-Jong Oh; Lili Liu; Jinhui Li; Hwong-wen Ma; Ngo Kim Chi; Stephen Moore
      Abstract: Although the 2Rs (reduce and reuse) are considered high-priority approaches, there has not been enough quantitative research on effective 2R management. The purpose of this paper is to provide information obtained through the International Workshop in Kyoto, Japan, on 11–13 November 2015, which included invited experts and researchers in several countries who were in charge of 3R policies, and an additional review of 245 previous studies. It was found that, regarding policy development, the decoupling between environmental pressures and economy growth was recognized as an essential step towards a sustainable society. 3R and resource management policies, including waste prevention, will play a crucial role. Approaches using material/substance flow analyses have become sophisticated enough to describe the fate of resources and/or hazardous substances based on human activity and the environment, including the final sink. Life-cycle assessment has also been developed to evaluate waste prevention activities. Regarding target products for waste prevention, food loss is one of the waste fractions with the highest priority because its countermeasures have significant upstream and downstream effects. Persistent organic pollutants and hazardous compounds should also be taken into account in the situation where recycling activities are globally widespread for the promotion of a material-cycling society.
      PubDate: 2017-02-21
      DOI: 10.1007/s10163-017-0586-4
  • Psychological driving forces behind households’ behaviors toward
           municipal organic waste separation at source in Vietnam: a structural
           equation modeling approach
    • Authors: Le Thi Thanh Loan; Hisako Nomura; Yoshifumi Takahashi; Mitsuyasu Yabe
      Abstract: Most recent municipal organic waste-separation at source (MOW-SAS) programs that have been introduced in developing countries remain pilot programs, but have not fully developed into sustainable municipal solid-waste management strategies. The city of Hoi An, Vietnam, implemented a mandatory MOW-SAS program in 2012. Using Structural Equation Modeling, this study investigates the psychological driving forces behind households’ behaviors toward the MOW-SAS program. This study finds that moral norm (moral perception of what is good or bad), attitude toward sorted waste, and situational factors (issues concerning physically sorting garbage, such as time, space, and lack of family cooperation) can significantly affect household behaviors toward MOW-SAS. It confirms the need for supplying frequent environmental educational campaigns and highlighting the benefits of MOW-SAS programs. Moreover, the study finds that households’ system trust in local authority concerning the MOW-SAS program is an important driving force behind the behavior. Therefore, recommendation is also made on the need to develop strong leadership in local authorities through improving: (1) reliability (ability to effectively treat sorted waste), (2) legitimacy (punitive measures for non-participants), and (3) effectiveness (dissemination of information about the benefits of MOW-SAS programs) for promoting MOW-SAS.
      PubDate: 2017-02-20
      DOI: 10.1007/s10163-017-0587-3
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