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Ye Z.-L.,Chinese Institute of Urban Environment | Xie X.,General Water of Xiamen Sewage Co. | Dai L.,General Water of Xiamen Sewage Co. | Wang Z.,Shanghai Waigaoqiao Power Generation Co. | And 5 more authors.
Waste Management | Year: 2014

Fresh leachate, generated in municipal solid waste incineration (MSWI) plants, contains various pollutants with extremely high strength organics, which usually requires expensive and complex treatment processes. This study investigated the feasibility of blending treatment of MSWI leachate with municipal wastewater. Fresh MSWI leachate was pretreated by coagulation-flocculation with FeCl3 2g/L and CaO 25g/L, plate-and-frame filter press, followed by ammonia stripping at pH above 12. After that, blending treatment was carried out in a full-scale municipal wastewater treatment plant (WWTP) for approximately 3months. Different operational modes consisting of different pretreated leachate and methanol addition levels were tested, and their performances were evaluated. Results showed that throughout the experimental period, monitored parameters in the WWTP effluent, including COD (<60mg/L), BOD5 (<20mg/L), ammonium (<8mg/L), phosphorus (<1.5mg/L) and heavy metals, generally complied with the Chinese sewage discharged standard. Under the experimental conditions, a certain amount of methanol was needed to fulfill TN removal. An estimation of the operation cost revealed that the expenditure of blending treatment was much lower than the total costs of respective treatment of MSWI leachate and municipal wastewater. The outcomes indicated that blending treatment could not only improve the treatability of the MSWI leachate, but also reduce the treatment cost of the two different wastewaters. © 2014 Elsevier Ltd.

Zhang H.,Xiamen Environmental Energy Investment and Development Co. | Liu H.,Xiamen Environmental Energy Investment and Development Co. | Huang S.,Xiamen Environmental Energy Investment and Development Co. | Wen X.,Xiamen Environmental Energy Investment and Development Co. | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2013

Garbage, leachate, fly ash, slag, and gas from two garbage incinerators in Xiamen were collected and analyzed. The results showed that kitchen wastes, rubber and plastic, and paper are the significant components of garbage which account for 78.08%. In term of the heavy metal contents in the samples, the order is Zn> Cu> Pb> Cr> Ni> Cd> Hg. More specifically, all the contents of heavy metal in the leachate are all quite low except Zn. Higher proportion of migration of Ni and Zn are found in the first plant then in the second plant which are 24.46% and 8.52%, respectively. The heavy metals have the same trend of migration in the second plant but are with higher contents. Fly ash and slag are found with more heavy metals than the gas. The contents of different heavy metals are quite different due to the different properties of them. Ash is classified as hazardous waste because it is with high concentrations of heavy metals which are easily extracted. Furthermore, the extraction concentrations of heavy metals significantly depend on the gas processing techniques.

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