硅藻土-颗粒污泥协同处理焦化废水研究  

Coordinated treatment of actual coking wastewater with diatomite and granular sludge

作　　者：董春娟[1] 翟伟[2] 冯美荣[3] 李峰[2] 樊红辉[2] 

机构地区：[1]太原大学环境工程系,山西太原030009 [2]太原理工大学环境科学与工程学院,山西太原030024 [3]太原市科技局科技交流中心,山西太原030009

出　　处：《南京理工大学学报》2013年第5期766-771,共6页Journal of Nanjing University of Science and Technology

基　　金：山西省自然科学基金(2011011008-3);山西省科技攻关项目(20120313008-2);太原市科技明星专项(11014929)

摘　　要：为了研究硅藻土与颗粒污泥协同处理焦化废水的运行特性,采用两个18L的微氧膨胀颗粒污泥床(EGSB)反应器(R1和R2)连续稳定运行7个多月,处理某焦化废水。运行分为两级不添加硅藻土、单级添加硅藻土、两级添加硅藻土3个阶段。研究结果表明:添加硅藻土有助于微氧EGSB反应器内化学需氧量(COD)、酚类、硫氰根离子(SCN-)和氰化物的去除,去除率分别从62.8%,62.6%,6.8%和78.0%提高到了77.7%,96.7%,86.4%和80.6%;氨氮NH3-N去除率由27.4%下降至负值(最低至-35.0%)。两级添加硅藻土微氧EGSB反应器系统能够同时高效去除COD、酚类、SCN-、氰化物和NH3-N。在R1+R2的水力停留时间(HRT)为12 h+12 h时,COD、挥发酚、SCN-、氰化物和NH3-N的总去除率分别为87.0%,99.9%,92.0%,90.6%和86.0%,出水浓度分别为239.4,0.3,12.5,0.06,和4.9 mg/L;添加硅藻土微氧EGSB反应器内形成的生物硅藻土,与颗粒污泥共同保证了反应器内的高污泥浓度、丰富菌种和足够的硝化菌量。SCN-和酚类均会抑制硝化菌,同时保证反应器内的低SCN-浓度和低挥发酚浓度才能获得高NH3-N去除率。To study the operation characteristic of the coordinated treatment of the actual coking wastewater with diatomite and granular sludge,two 18 L micro-aerobic expanded granular sludge beds(EGSB) reactors fed(R1+R2) with the coking wastewater are operated continuously for a period of over 7 months.The operation process contains three stages:the two-stage micro-aerobic EGSB without diatomite,the single-stage micro-aerobic EGSB with diatomite,and the two-stage micro-aerobic EGSB with diatomite.The results show that the diatomite can enhance the removal rates of chemical oxygen demand(COD),phenol,thiocyanate ion(SCN-) and cyanide in the micro-aerobic EGSB reactor treating actual coking wastewater,and the removal rates of COD,phenol,SCN-and cyanide increase respectively from 62.8%,62.6%,6.8% and 78.0% to 77.7%,96.7%,86.4% and 80.6%.The removal rate of ammonia nitrogen(NH3-N) decreases from 27.4% to negative value(the lowest is- 35.0%).The two-stage micro-aerobic EGSB reactor system with diatomite can simultaneously achieve the high removal rates of COD,phenol,SCN-,cyanide and NH3- N.With 12 h+12h hydraulic residence time(HRT) of R1+R2,the total removal rates of COD,phenol,SCN-,cyanide and NH3- N are 87.0%,99.9%,92.0%,90.6% and 86.0% respectively,and the effluent concentrations are 239.4,0.3,12.5,0.06,and 4.9 mg / L.In the micro-aerobic EGSB reactor with diatomite,the bio-diatomite and granular sludge formed synchronously can ensure the high biomass concentration,the enrichment micro-community and the enough nitrifying bacteria.SCN-and phenol can inhibit the activity of nitrifying bacteria,and the SCN-inhibition is due to the toxicity of SCNitself,but not the increased loading of ammonia formed from SCN-degradation.The lower SCN-and phenol concentration are needed simultaneously for getting the higher NH3- N removal rate.

关 键 词：膨胀颗粒污泥床反应器 硅藻土 焦化废水 硫氰根离子 酚类 氨氮 

分 类 号：X784[环境科学与工程—环境工程]