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Wu Z.-S.,Chongqing University | Wu Z.-S.,Lingzhi Environmental Protection Co. | Tang S.-T.,Chongqing Sanxia Environmental Groups | Ling J.-J.,Lingzhi Environmental Protection Co. | And 3 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2012

Based on the self-developed integrative reactor for treating municipal solid waste(MSW) and sewage treatment plant sludge (STP sludge), a start-up experimental study on MSW composting and anaerobic thickening and digestion of STP sludge was carried out. The results indicate that at the ambient temperature of 17°C to 28°C, the temperature of refuse processing vessel maintains between 17°C and 30°C; with a pH ranging from 3 to 6, temperature in the sludge digestion vessel is basically stable between 15°C and 30°C; with a pH ranging from 5.5 to 7.4, the SV/ST of influent sludge is between 0.40 and 0.80 while that of discharged sludge descends to 0.30-0.45; the moisture content of discharged sludge is quite changeable, however, it becomes more stable at around 92% compared to the influent moisture content of 98.6% to 99.8% after 30 d. The integrative reactor has realized the co-processing of MSW and STP sludge together. It provides sludge thickening and digestion with high temperature conditions by making use of refuse composting heat. The integrative reactor, however, still remains to be improved.

Hu X.,Chongqing University | Luo K.,Chongqing University | Wang J.,Chongqing University | Wu Z.,Chongqing University | And 2 more authors.
Water Environment Research | Year: 2015

In this study, FLUENT software was used to simulate the flow regime of an integrated sludge thickening and digestion reactor. To optimize the flow regime, the combinational effect of key parameters of the reactor structure was investigated with an L16 (45) orthogonal test. The reactor was then redesigned based on the optimization results, and a series of experiments was conducted to study the treatment effect with sludge dosage rates of 12, 18, 24, and 30%. The operation results showed that the reactor obtained the best treatment efficiency when the sludge dosage rate was 24%. At this dosage, the water content of the sludge decreased from 99.1% to 91.8%, with organic matter content (volatile solids [VS]/total solids) decreasing to 21.2% and average gas production (CH4 62.66%, CO2 11.56%, N2 23.91%, O2 1.59%) reaching 231.3 L/kg VS. Therefore, the results implied that the optimized reactor has good effects on sludge thickening and digestion.

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