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Bian B.,Jiangsu Academy of Environmental Sciences | Bian B.,Jiangsu Province Key Laboratory of Environmental Engineering | Zhou L.,Jiangsu Academy of Environmental Sciences | Zhou L.,Jiangsu Province Key Laboratory of Environmental Engineering | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

In this study, the law of gases generated from solidification sludge landfill tests and the effect of solidified materials content was investigated using a large landfill column. The results showed that the gas yield and compositions were varied with solidified materials content and also displayed different gas production laws. It could be divided into three stages, which were inhibition stage, increasing stage and declining stage with low solidified materials content (4%~8%). While the high solidified materials content (12%~30%) was completely different appearance. It was just one stage and the rate of gas yield decreased with increasing retention time. Furthermore, the degradation of solidified sludge in landfills was actually a solid-liquid-gas three phase transformation process, which was organic matter in sludge was decreasing and gas yield and water content increasing process in detail. Especially when solidified materials content was 25%, the water and gas yield was very low meaning the degradation of organic matter was almost completely suppressed, and which also indicated that the landfill systems may not require gas collection and emission system when filled with all solidification sludge. Source


Peng M.,Changzhou University | Zhu W.,Jiangsu Welle Environmental Co. | Du E.,Changzhou University | Shi D.,Changzhou Domestic Waste Treatment Center | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

A pilot-scaled process combined with mechanical leaching and anaerobic biology was utilized to treat the organic household waste. The process could give full play to the role of hydrolysis and acidogenesis in mechanical leaching reactor, and the role of methanogenesis in anaerobic bioreactor. The acclimation of anaerobic bioreactor can be completed in 15 days after inoculation. The effluent recycle rinse water significantly influences the performance of mechanical leaching reactor. Under the condition of leaching reflux 3.0 m3/d, chemical oxygen demand (COD) and volatile organic acids (VFA) declined to 41 000 mg/L and 2 000 mg/L in 8 days, separately. The tests were conducted for several times. Organic household waste can averagely produce biogas of 87.2 m3 per ton, which contains 75% of methane. The average biogas production rate was 0.46 m3/kg COD. COD of anaerobic bioreactor effluent was 560 mg/L on the average. The process could effectively treat organic household waste, simultaneously realize the resource utilization of organic household waste. ©, 2015, Science Press. All right reserved. Source


Wang F.,Jiangsu Welle Environmental Co. | Qian C.,Jiangsu Welle Environmental Co. | Li C.,Jiangsu Welle Environmental Co. | Zhang J.,Jiangsu Welle Environmental Co. | Jin H.,Jiangsu Welle Environmental Co.
Chinese Journal of Environmental Engineering | Year: 2016

The BIOBUNK reactor can be used to dispose broken MSW, and we studied on plenty of important parameters such as COD, pH, VFA, and VS/TS in the MSW's leachate and TS, VS/TS and solid phase reduction rate in the solid materials. According to the obtained results, in regards to the leaching effect, using the mixed liquor of the anaerobic effluent and acidulated kitchen waste seriflux as raw liquidis more beneficial than only using the anaerobic effluent.The experimental results has show that the COD, VFA, TS, and VS of the leachate increased by 14%, 13%, 1%, and 3.5%, respectively; however, the pH of leachate reduced by 0.6.Moreover, the solid phase reduction rate and VS reduction rate improved by 1.8% and 6.7%, and the solid residue low heat value (LHV) (wet base), which was about 16 900 kJ/kg, was much higher than the original MSW, which was about 3 490 kJ/kg. Therefore, due to its high heat value, the solid residue disposed by the DAMP reactor can be considered to produce biotechnology derived fuel. © 2016, Science Press. All right reserved. Source


Zhou L.,Jiangsu Welle Environmental Co. | Han Y.,Jiangsu Welle Environmental Co. | Zhang H.,Jiangsu Welle Environmental Co. | Hu Z.,Jiangsu Welle Environmental Co. | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

In order to improve the treatment effect of coking water in biochemical system, activated sludge was cultivated, the effect on coking wastewater was studied. The results showed that domestication time was two months, quantity of inlet was 150 L/d and volumn load was 2 kg COD/(m3·d) with concentration of suspended solids was 2 000 mg/L, SV30 was 20%.The removal rate of chemical oxygen demand was 85%, the removal rates of volatile phenol and cyanide were 100% and 95%, respectively. There was no removal rate on ammonia nitrogen. ©, 2015, Science Press. All right reserved. Source


Qu Y.,Jiangsu Welle Environmental Co. | Zhang J.,Jiangsu Welle Environmental Co. | Zhu W.,Jiangsu Welle Environmental Co. | Pan T.,Jiangsu Welle Environmental Co. | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

The influence of percolation hydrolysis, dewatering and aerobic biodrying on the treatment of municipal solid waste (MSW) using mechanical biological treatment (MBT) plants was discussed. The output quality, total solid in MSW, refined derived fuel (RDF) content and leachate properties were critically examined. The results showed that the quality of MSW could decrease 49.7% when the mass ratio of percolation water to MSW was 2 ∶1 and the residence time was 1.2~1.4 d during the stage of percolation hydrolysis and dewatering in the MBT.Moreover, the COD concentration and pH value of leachate were 32 939 mg/L and 5.1, respectively. The ratio of COD, total nitrogen and total phosphorus was 261 ∶6 ∶3.6, meaning that the leachate could be processed by anaerobic digestion treatment or used as a carbon source for resources utilization. In addition, the body temperature of MSW could rise to 73℃ when the ventilation rate was 0.08 m3/min and the residence time was 2~3 d during the aerobic biodrying state. Furthermore, a high quality RDF was produced, which the low calorific value, recovery rate and chlorine content was 15 000 kJ/kg, 38.2% and less than 0.5%, respectively after 7 d. Besides, the heavy metal content in RDF was very low and will well meet the requirements of fuel. ©, 2015, Science Press. All right reserved. Source

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