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Emission characteristics of dioxins,furans and polycyclic aromatic hydrocarbons during fluidized-bed combustion of sewage sludge

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Journal of Environmental Sciences 2009年第12期21卷 1747-1752页

作者： deng wenyi, yan jianhua, li xiaodong, wang fei, chi yong, lu shengyongstate key laboratory of clean energy utilization, institute for thermal power engineering, zhejiang university, hangzhou 310027, china. State key laboratory of clean energy utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China

Pre-dried sewage sludge with high sulfur content was combusted in an electrically heated lab-scale fluidized-bed incinerator. The emission characteristics of polychlorinated dibenzo-p-dioxins （PCDDs）, polychlorinated dibenzofurans （PCDFs） and polycyclic aromatic hydrocarbons （PAHs） were studied. Coal and calcium oxide （CaO） were added during the sewage sludge combustion tests to optimize combustion conditions and control SO2 emission. The results indicated that the flue gases emitted during mono-combustion of sewage sludge were characterized by relatively high concentrations of SO2, NOx and organic pollutants, due to the high sulfur, nitrogen, and volatile matter content of sewage sludge. The total 16 USEPA priority PAHs and 2,3,7,8-substituted PCDD/Fs produced from sewage sludge combustion were found to be 106.14 μg/m^3 and 8955.93 pg/m^3 in the flue gas, respectively. In the case of cocombustion with coal （msludge/mcoal =1：1）, the 16 PAHs and 2,3,7,8-substituted PCDD/Fs concentrations were markedly lower than those found during mono-combustion of sewage sludge. During co-combustion, a suppressant effect of CaO on PCDD/Fs formation was observed.

关键词： co-combustion PCDD/Fs polycyclic aromatic hydrocarbons (PAHs) sewage sludge

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Moisture distribution in sludges based on different testing methods

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Journal of Environmental Sciences 2011年第5期23卷 875-880页

作者： wenyi deng xiaodong li jianhua yan fei wang yong chi Kefa Cen School of Environmental Science and engineering Donghua University Shanghai 201620 China. E-mail: dengwy@*** State key laboratory of clean energy utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China

Moisture distributions in municipal sewage sludge, printing and dyeing sludge and paper mill sludge were experimentally studied based on four different methods, i.e., drying test, thermogravimetric-differential thermal analysis （TG-DTA） test, thermogravimetric- differential scanning calorimetry （TG-DSC） test and water activity test. The results indicated that the moistures in the mechanically dewatered sludges were interstitial water, surface water and bound water. The interstitial water accounted for more than 50% wet basis （wb） of the total moisture content. The bond strength of sludge moisture increased with decreasing moisture content, especially when the moisture content was lower than 50% wb. Furthermore, the comparison among the four different testing methods was presented. The drying test was advantaged by its ability to quantify free water, interstitial water, surface water and bound water; while TG-DSC test, TG-DTA test and water activity test were capable of determining the bond strength of moisture in sludge. It was found that the results from TG-DSC and TG-DTA test are more persuasive than water activity test.

关键词： moisture distribution sludge bond strength

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Emission and drying kinetics of paper mill sludge during contact drying process

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Journal of zhejiang university-Science A(Applied Physics & engineering) 2009年第11期10卷 1670-1677页

作者： Wen-yi deng Xiao-dong li Jian-hua yan fei wang Sheng-yong lu yong chi Ke-fa CEN State key laboratory of clean energy utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China

The emission and contact drying kinetics of the paper mill sludge (PMS) were studied through experiments carried out in a paddle dryer. To get a better understanding of its drying mechanism, a penetration model developed by Tsotsas and Schlünder (1986) was used to simulate the drying kinetics of the PMS. The result indicated that this kinetics could be divided into three phases: pasty, lumpy and granular phases, and could be successfully simulated by the penetration model as the related sludge parameters were integrated into the model. The emission rate curves of the volatile compounds (VCs) were interrelated to the drying rate curve of the PMS, especially for volatile fatty acids (VFAs) and ammonia in this study.

关键词： Contact drying Emission Paper mill sludge (PMS) Paddle dryer

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