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Comparison between controlled landfill reactor and conditioned landfill bioreactor

Journal of Environmental Sciences 2004年第5期16卷 874-880页

作者： LUOFeng CHENWan-zhi SONGFu-zhong LIXiao-peng ZHANGGuo-qing CollegeofResourceandEnvironmentalScience ChongqingUniversityChongqing400044China chongqingenvironmentalprotectionbureau Chongqing400010China ChongqingConstructionCommittee Chongqing400010China

Bioreactor landfills allow a more active landfill management that recognizes the biological, chemical and physical processes involved in a landfill environment. The laboratory-scale simulators of landfill reactors treating municipal solid wastes were studied, the effect of solid waste size, leachate recirculation, nutrient balance, pH value, moisture content and temperature on the rate of municipal solid waste(MSW) biodegradation were determined, and it indicated the optimum pH value, moisture content and temperature decomposing MSW. The results of waste biodegradation were compared with that of the leachate-recirculated landfill simulator and conservative sanitary landfill simulator. In the control experiment the antitheses of a decreasing trend of the organic load, measured as biological oxygen demand and chemical oxygen demand, was shown. An obvious enhancement of effective disposal from conservative sanitary landfill(CSL) simulator, to the leachate-recirculated landfill(LRL) simulator and to the conditioned bioreactor landfill(CBL) simulator would be noted, through displaying the compared results of solid waste settlement, heavy metal concentration in leachate, methane production rate, biogas composition, BOD and COD as well as their ratio.

关键词： landfill bioreactor methanogenesis methane production municipal solid waste leachate recirculation biodegradation of solid waste specific methanogenic activity(SMA)

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Emission control for precursors causing acid rain(V): Improvement of acid soil with the bio-briquette combustion ash

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Journal of Environmental Sciences 2004年第5期16卷 705-711页

作者： DONGXu-hui SAKAMOTOKazuhiko WANGWei GAOShi-dong ISOBEYugo Sino-JapaneseFriendshipCenterforEnvironmentalProtection Beijing100029China GraduateSchoolofScience＆Engineering SaitamaUniversity255Shimo-ohkuboUrawaSaitama338-8570Japan InstituteforEnvironmentalStudiesofChina chongqingenvironmentalprotectionbureau China

The bio-briquette technique which mixes coal, biomass and sulfur fixation agent and bio-briquettes under 3—5 t/cm 2 line pressure has aroused people's attention in view of controlling the air pollution and the acid rain. In this paper, the physicochemical properties of bio-briquette and its ash were investigated. And the acid soil was improved by the bio-briquette combustion ash, which contained nutritive substances such as P, N, K and had the acid-neutralizing capacity(ANC). The pH, EC, effective nutrient elements(Ca, Mg, K, P and N), heavy metal elements(Al, Cu, Cd, Cr, Zn and Mn) and acid-neutralizing capacity change of ash-added soils within the range of 0—10%, were also studied. Specially, when 5% bio-briquette combustion ash was added to the tested soil, the content of the effective elements such as Ca, Mg and K rose by 100 times, 7 times and twice, respectively. The total nitrogen also increased by about twice. The results showed the oxyanions such as that of Al, Cu, Cd, Cr, Zn and Mn were not potentially dangerous, because they were about the same as the averages of them in Chinese soil. It is shown that the ANC became stronger, though the ANC hardly increases in the ash-added soil. On the basis of the evaluation indices, it is concluded that the best mixture ratio is to add 2.5%—8% of the bio-briquette combustion ash to the tested soil.

关键词： bio-briquette combustion ash soil improvement ANC heavy metal element nutrient element

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