微电解-UASB-接触氧化处理羧甲基纤维素废水

针对羧甲基纤维素(CMC)废水高浓度、高盐分和难生物降解的特点,采用微电解-UASB-生物接触氧化组合工艺处理高浓度CMC废水。废水含盐约4%,COD和BOD5分别约20000mg.L-1和2100mg.L-1。最佳条件下微电解对COD去除率为35%,处理后废水B/C提高到0.34,稀释后经UASB和两级接触氧化法对COD的去除率分别达到了80%、75%和65%,最终出水COD在100mg.L-1以下,达到国家一级排放标准。通过GS-MS和颗粒污泥分析,分别研究了微电解对污染物去除特性和去除机理与UASB的启动特性。微电解-UASB-生物接触氧化组合技术具有运行稳定、高效和抗冲击等优点。

Microelectrolysis-UASB-contact oxidation process for treatment of carboxymethyl cellulose production wastewater

The wastewater with high pollutant concentration of 20000 mg·L^-1（COD）and 2100 mg·L^-1（BOD₅），high salinity of about 4% and nonbiodegradable from carboxymethyl cellulose production was treated by combined process of microelectrolysis，UASB and biological contact oxidation.The results show that at the optimal conditions the removal of COD by microelectrolysis is 35% and B/C ratio increases up to 0.34.For diluted wastewater，by subsequent UASB anaerobic and two stage biological contact oxidation processes，the removal efficiency of COD is more than 80%，75% and 65%，and the COD value of final effluent is below 100 mg·L^-1 and up to the national first-grade emissions standards.The features and mechanism of pollutant removal by microelectrolysis as well as the characteristics of UASB start-up were also studied by means of GC-MS and analyzing granular sludge.The combined process of microelectrolysis，UASB and contact oxidation is of the advantages such as operation stability，high efficiency and shock resistance.