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Changes of Cu, Zn, and Ni chemical speciation in sewage sludge co-composted with sodium sulfide and lime

Journal of Environmental Sciences 2008年第2期20卷 156-160页

作者： WANG Xuejiang CHEN Ling XIA Siqing ZHAO Jianfu State Key Laboratory of Pollution control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China

A batch composting study was performed to evaluate the feasibility of co-composting sewage sludge with sodium sulfide and lime （SSL） mixture （Na2S/CaO= 1：1）, aiming at reducing the availability of heavy metals in the sludge compost. Sewage sludge with sawdust as a bulking agent was amended with SSL at 3% （w/w, dw）, and composted for 15 d in laboratory batch reactors. The four stages of the Tessier sequential extraction method was employed to investigate changes in heavy metal fractions of Cu, Zn, and Ni in sewage sludge composted with SSL. For all the three metals, the mobile fractions, such as, exchangeable and carbonate bound were mainly transformed into low availability fractions （organic matter and sulfide, Fe-Mn oxides bound and residual forms）, and the addition of SSL enhanced this transformation. Therefore, SSL is a suitable material to co-compost with sewage sludge to reduce the availability of heavy metals. According to the cabbage seed germination test, a SSL amendment of ≤3% （w/w, dw） is recommended to co-compost with sewage sludge.

关键词： sewage sludge co-composting heavy metals sequential extraction

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Dissolved organic carbon,a critical factor to increase the bioavailability of phosphorus during biochar-amended aerobic composting

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Journal of Environmental Sciences 2022年第3期34卷 356-364页

作者： Hu Cui Yang Ou Lixia Wang Baixing Yan Yingxin Li Meiwen Bao Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China Jilin Provincial Engineering Center of CWs Design in cold Region&Beautiful country construction Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China University of Chinese Academy of Sciences Beijing 100049China

considerable research efforts have been devoted to increase phosphorus(P)availability during aerobic ***,there is little discussion weather the dissolved organic carbon(DOC)controls the transformation among ***,we investigated the changes in DOC compositions and P-fractions during biochar-amended composting(wet weight basis,5%and 10%).TP content continuously increased since the'concentration effect'during aerobic ***_(3)-Pi,NaOH-Pi and HCl-Pi were main P-fractions,and biochar can improve P-bioavailability by transforming NaOH-Pi and HCl-Pi into NaHco_(3)-*** equation models(SEMs)indicated that biochar enhanced the P-bioavailability through regulating the decomposition of *** results at least hint that the activation mechanism on P under the influence of DOC during biochar-amended composting.

关键词： co-composting Biochar Dissolved organic carbon Phosphorus fractions

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Effects of Different Organic Residues on Rice Yield and Soil Quality

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Journal of Mountain Science 2012年第5期9卷 715-722页

作者： PENG Li LIU Wei SU Chunjiang LI Ping FANG Yan WANG Xiaolan SUN Lian Institute of Mountain Hazards and Environment Chinese Academy of SciencesNo.9.Section 4South Renmin RoadChina Graduate University of Chinese Academy of Sciences Beijing 100049China Institute of Horticulture Sichuan Academy of Agricultural SciencesChengdu 610066China Key Laboratory of Horticultural Crops Biology and Germplasm Enhancement in Southwest Regions Ministry of AgricultureChengdu 61oo66China Southwest Jiaotong University Chengdu 610031China Sichuan Technology and Business collage Dujiangyan 611844China Sichuan Provincial Environmental Information Center Chengdu 610015China

Calcaric regosols are a valuable land resource, distributed widely across western China. Soil quality has deteriorated considerably in recent years owing to the blind pursuit of economic benefits. A 2-year field experiment was carried out to evaluate the effects of using spent mushroom compost, leguminous plant (Vicia sepium L.) compost, and a combination of the two (at a 1:1 and 2:1 ratio), on rice yield and soil quality in a suburb of China. Vicia sepium L. composted with spent mushroom compost at a 1:1 ratio produced the highest grain and stover yield, grain and stover phosphorus concentration, and phosphorus uptake of rice; they were 56.5%, 93.2%, 89.3%, 198.6% and 22.2% greater than control soil, respectively. The 2:1 ratio (Vicia sepium L.: spent mushroom compost) produced the highest grain N concentration, stover N concentration, and N uptake; they were 31.6%, 31.4%, and 40.7% higher than control, respectively. Soil physical, chemical, and environmental properties were improved with the application of Vicia sepium L. composted with spent mushroom compost at a 2:1 ratio. In particular, soil water-stable aggregates, organic carbon, particulate organic carbon, total nitrogen, available potassium, and cation exchange capacity increased, whereas bulk density, pH, and phytoavailable heavy metals decreased. This organic treatment is beneficial to improve soil quality indicators, and contribute to soil restoration.

关键词： co-composting Leguminous plants Soilquality indicators Soil restoration Spent mushroomcompost

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Water extractable plant nutrients in soils amended with cow manure co-composted with maple tree residues

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International Journal of Agricultural and Biological Engineering 2018年第5期11卷 167-173页

作者： Zobia Anwar Muhammad Irshad An Ping Farhan Hafeez Shao Yang Department of Environmental Sciences COMSATS University IslamabadAbbottabad CampusAbbottabad 22060Pakistan Arid Land Research Center Tottori UniversityHamasaka cho Tottori 680-0001Japan

Studies on the availability of plant nutrients in soils treated with manure co-composted feed-stocks are very *** present investigation aimed at studying the nutrient release pattern from three soils amended with maple tree leaves co-composted with cow *** were mixed with the compost at the rate of 20 t/hm^(2) and incubated at room *** to incubation,plants residue samples were analyzed for total elemental concentrations(NO_(3),NH_(4),P,K,Ca,Mg,Na,Zn,Mn,Fe,Cu,Ni and Cd).Water extractability of nutrients from soils was affected by the type of soil and ratio of composted manure *** NH_(4),P,K,Ca and Mg concentrations varied in the descending order of sandy clay,sandy loam and silt loam except NO_(3).The concentrations of P,K,Ca and Mg in the amended soils increased with the ratio of manure co-composted with leaf litter while those of NO_(3),NH_(4) and trace elements *** residual nutrients in soil varied directly with their contents in the compost ***-composting improved the availability of nutrients in soils and this should be an ideal approach to managing the enormous waste generated from the livestock sector for restoring soil fertility.

关键词： macro-elements micro-elements varied textured soils co-composting cow manure maple plant residues

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Role of rural solid waste management in non-point source pollution control of Dianchi Lake catchments, China

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Frontiers of Environmental Science & Engineering 2008年第1期2卷 15-23页

作者： Wenjing LU Hongtao WANG Department of Environmental Science and Engineering Tsinghua UniversityBeijing 100084China

In recent years,with control of the main muni-cipal and industrial point pollution sources and imple-mentation of cleaning for some inner pollution sources in the water body,the discharge of point source pollution decreased gradually,while non-point source pollution has become increasingly distressing in Dianchi Lake *** one of the major targets in non-point source pollution control,an integrated solid waste controlling strategy combined with a technological solution and man-agement system was proposed and implemented based on the waste disposal situation and characteristics of rural solid waste in the demonstration *** the key techno-logy in rural solid waste treatment,both centralized plant-scale composting and a dispersed farmer-operated waste treating system showed promise in rendering timely ben-efits in efficiency,large handling capacity,high quality of the end product,as well as good economic *** encountered during multi-substrates co-com-posting such as pathogens,high moisture content,asyn-chronism in the decomposition of different substrates,and low quality of the end product can all be tackled.92.5% of solid waste was collected in the demonstration area,while the treating and recycling ratio reached 87.9%,which pre-vented 32.2 t nitrogen and 3.9 t phosphorus per year from entering the water body of Dianchi Lake after imple-mentation of the project.

关键词： co-composting Dianchi Lake catchments non-point source pollution rural solid waste

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