湿式氧化、微电解和膜生物反应器组合工艺处理杀菌剂废水.pdf

湿式氧化 、 微电解和膜生物反应器组合工艺处理杀菌剂废水 ＊ 韩卫清 周 刚 王连军 孙秀云 李健生 南京理工大学化工学院, 南京 210094 摘要 杀菌剂生产废水含有大量有机物和无机盐, 特别含有异噻唑啉酮和硫化物, 对生化细菌有强的抑制和毒害作 用, 且 BOD5 CODCr值较小, 废水采用传统生化处理工艺无法进行。而采用湿式氧化、微电解和膜生物反应器组合工艺 建成的废水处理工程, 运行良好, 出水各项指标达到国家排放标准。 关键词 氧化 微电解 膜生物反应器 异噻唑啉酮 硫化物 ＊江苏省环保基金项目 2002005 ; 南京理工大学产学研基地基金支 持项目。 0 引言 徐州 精细化工有限公司生产的杀菌剂主要 成分为异噻唑啉酮, 它是一种工业用广谱杀菌剂。该 厂排放生产废水含有有机物质主要为 5 -氯-2- 甲基-4- 异噻唑 啉-3 -酮 CMI和 2-甲基-4-异噻 唑 啉-3 -酮 MI 、 二硫代二丙酸甲酯 、二硫代二丙酸甲胺酯、丙 烯酸甲脂、乙酸乙脂 、 甲胺醇等; 无机物主要为 Na 、 Mg 2 、 NH 4、 NO 2- 3、 S 2- 、S、S2O 2- 3、SO 2- 3、SO 2- 4、Cl -等。 监测废水中化学耗氧量高达25 000 mg L 、 异噻唑啉酮 200 mg L 、 S 2-500 mg L ,且有机硫在生物厌氧降解过 程中将产生 S 2- 。S 2-和异噻唑酮对微生物有较强毒 害性 ; BOD5 CODCr为 0. 01,可生化性差 ,采用传统生化 处理工艺无法运行 [ 1,2] 。在小试基础上建成了采用湿 式氧化、 微电解和膜生物反应器组合工艺废水处理工 程; 运行良好。各项指标低于国家排放标准 ,并通过 徐州市有关部门组织的鉴定验收。 1 进水和出水指标 进入废水处理厂工业废水水质 、 水量及出水水质 见表 1 [ 3] 。 表 1 废水处理厂进、出水水质表mg L pH 除外 项目pHCMI MIS2-CODCrBOD5SS 水量 m3d- 1 进水5 ～ 6190～ 2001 50025 000200～ 250500～ 55010 出水6 ～ 91. 01002012, 生在 FeS 沉淀而 去除, 经过微电解还原和石灰乳混凝沉淀 , 出水 CODCr10 000 mg L左右 ,硫化物脱除率达到 95以上 , S 2-降为 10 mg L 左右。 4. 3 膜生物反应器 废水经氧化 、 微电解处理后, 进入膜生物反应器 之前 ,首先与全厂生活污水 水量 40 m 3 d 合并一起 进入酸化水解池 、 接触氧化池 。考虑脱氮和减少酸化 水解冲击负荷的影响 ,接触氧化池出水回酸化水解池 流量 200。接 触氧化池 出水 CODCr在 250 mg L 左右 。 曝气生物膜反应器工艺是采用膜分离技术代替 传统的二沉池。由于集微生物的生物降解作用和膜 的高效分离作用于一体, 在运行期间, 曝气生物膜反 应器工艺具有以下优点 [ 6] 1 膜的截留作用使生物反应器内污泥浓度高, 有效提高容积负荷。 2 由于生物降解和膜分离的协同作用 ,膜生物 反应器抗冲击能力增强, 污染物去除率高 ,处理出水 水质稳定。不仅对悬浮物、有机物去除率高 ,而且可 以去除细菌、 病毒等 。 3 实现了水力停留时间和污泥龄的完全分离, 使运行控制更加灵活 、 稳定,运行、 操作简化。 4 硝化能力高, 膜生物反应器工艺中污泥龄的 延长, 营造了有利于硝化细菌生长的环境 ,因而可提 高硝化能力 。 5 剩余污泥量少 ,污泥处理费用低。 膜生物反应器安装 PP 中空纤维膜组件 50 片 ,膜 面积 8 m 2 片; 设计出水量 1 m3 片d , 共计出水量 50 m 3 d。 池内采用穿孔管曝气 ,自吸泵间断式负压出 水,自吸泵负压 20 kPa。 5 运行效果 1 徐州 精细化工有限公司生产异噻唑啉酮 杀菌剂废水含有异噻唑啉酮和硫化物,该污染物质对 生化处理细菌有较强抑制和毒害作用 。采用化学氧 化和微电解工艺可以有效地去除异噻唑啉酮和硫化 物、 削减CODCr。并提高废水的可生化性。 2 经过预处理后的废水采用酸化水解 、 接触氧 化和膜生物反应器工艺, 运行稳定。经徐州市有关部 门监测 , 出水 CODCr50 ～ 80 mg L ,S 2- 0. 8 mg L, 远远 低于国家一级排放标准, 其它各项指标均能达标; 处 理后废水部分回用生产, 有效节约水资源 。 参考文献 [ 1] 杨柳燕, 马文漪, 蒋峰. 水解 -好氧法处理含硫废水的研究. 中国 环境科学, 1996, 16 6 443 -444. [ 2] Peter Fox, Venkatraghavan Venkatasubbiah. Coupled Anaerobic Aerobic Trematment of High -Sulfate Wastewater with Sulfate Reduction and Biological Sulfide Oxidation. Water Science Technology, 1996, 34 6 359 -366. [ 3] 国家环境保护局环境监测分析方法编写组. 环境监测分析方 法. 北京 中国环境科学出版社,1983. [ 4] 缪应祺. 废水生物脱硫机理及技术. 北京 化学工业出版社, 2004. [ 5] 潘国龙. 催化氧化法处理含硫废水. 环境工程. 1992, 11 4 15 -17. [ 6] 崔正国, 王修林, 单宝田. 膜生物反应器在工业废水处理中的研 究及应用. 水处理技术, 2005, 31 5 7 -10. 作者通讯处 王连军 210094 南京理工大学化工学院 电话 025 84315941 E -mail wanglj mail. njust. edu. com 2006- 05-25 收稿 14 环 境 工 程 2007年 4 月第25 卷第2 期 PILOT STUDIES ON TREATING MUNICIPAL SEWAGE UNDER NORMAL TEMPERATURE BY MODIFIED EGSBZhang Xuanjun Ma Xiujuan Zhou Xuefei et al7 Abstract It is examined that the effects of circumfluence ratio, hydraulic retention time and volume loading rate on treating urban sewage by modified expaned granular sludge bed EGSB . The results show that the effluent CODfiltof modified EGSB is decreased as circumfluence ratio increasing and hydraulic retention time decreasing, however, effluent SS, CODfiltand CODCrare increased evidently when hydraulic retention time is lower than 2 h. As compared with unmodified EGSB, effluent CODCrof modified EGSB is decreased by 26. 7 mg L and CODfiltis decreased by 17. 8mg L, while SS is also decreased by 66. 3 mg L. The modified EGSB and unmodified EGSB became unstable when volume loading rate increased abruptly ; however, modified EGSB can recover from impact easier than unmodified EGSB. Keywords EGSB, municipal sewage, volume loading rate and impact STUDY ON BIOLOGICAL FLUIDIZED REACTOR OF AEROBIC -ANOXIC INTEGRATED HIGH - EFFICIENCY SEPARATIONZhang Yukui Shi Guifang Shi Hanchang 10 Abstract As the requirementsof phosphorous removal and denitrificationinwastewater treatment, and there are some shortcomingsininner circulated three -phase biological fluidized bed, we designed and developed a kind of biological fluidized reactor of aerobic -anoxic integrated high- efficiency separation BRAIH . A kind of unique cellular structure is used in aerobic fluidized area of BR AIH. When volume of BRAIH is increased, and height of BRAIH is not added, height-diameter ratio of fluidized area H Dcan be ensured. While solid and liquid separation based on sedimentation on inner circulated fluidized bed can not ensure water quality of effluent, coupling of circulated fluidized reactor and high- efficiency air floatation can reduce suspended solid SSof effluent. Aerobic area and anoxic area are together in BRAIH, and through air lifting canrealize backflow of aerobic area effluent, so BRAIH can achieve denitrification and part phosphorous removal. By treatment of municipal wastewater, it is proved that BRAIH can effectively resist impact load and remove organic substance. Keywords aerobic -anoxic integration, high efficiency separation, biological fluidization, air floatation and carrier separator DISPOSING THE BACTERICIDE WASTEWATERWITHTHE PROCESS OF OXIDATION -MICRO- ELECTROLYSIS -MEMBRANE BIOREACTORHan Weiqing Zhou Gang Wang Lianjun et al 13 Abstract A production wastewater contains lots of organic compounds and inorganic salts, and especially it has isothiazoline -ketone and sulfide , which are harmfulto the bacteria disposing the wastewater. The ratio of BOD5to CODCris smaller. Therefore itisvery difficult to decompose by conventional biochemical treatment technologies. Making use of the wastewater disposing project of oxidation-microeleclrolysis-membrane bioreactor can get a good operation. And the inds of the effluent can meet the national emission standard. Keywords oxidation, micro -electrolysis, membrane bioreactor, isothiazoline -ketone and sulfide TREATMENT OF LOWC N LANDFILL LEACHATE BY PROCESS OF SHORT-RANGE NITRIFICATION -DENITRIFICATIONLi Jun Peng Feng He Jianping et al 15 Abstract As to the characteristics of landfill leachate and some problems in the traditional process of biologic nitrogen removal, combined with research conditions at the present both at home and abroad, it is put forward a new process that can treat landfill leachate with short -range nitrification -denitrification. The nitrite accumulation and ammonia removal rate have been pered steadily by controlling average dissolved oxygen concentrations of 2. 0mg L and temperature of 302 ℃ in the nitrifying activated sludge reactor, and nitrite accumulation rate [ NO - 2-N NO - 2-NNO - 3-N ] and ammonia removal rate can be maintained at 83 and 85, respectively. The results of the experimentation indicate that as compared with traditional process of biologic nitrogen removal, the process has obvious higher sludge load rate, lower oxygen consumption and carbon requirement aswell as a higher efficiency and velocity of denitrification, and so it has a higher TN removal rate accordingly . Keywords biologic nitrogen removal, landfill leachate, low C N and short-range nitrification-denitrification TREATMENT OF SLIGHTLY POLLUTED YELLOW RIVER RAW WATER USING TWO BIOFILM REACTORSShi Dongwen Chen Jianbo Xi Danli et al 18 Abstract CODMnremoval by bio -ceramic filter was similar to that by moving bed biofilm reactor, however, the er process demonstrated a much higher removal efficiency of UV254, chloro precursors and chlorophyll a Chla.Bio -ceramic filter also had better ammonia removal rate and nitrite in its effluent was lower. Keywords moving bed biofilm reactor, bio -ceramic filter, pretreatment and Yellow River water PRELIMINARY STUDY ON THE DYIEING WASTEWATER TREATMENT BY HYDRODYNAMIC CAVITATION TECHNIQUEWei Qun Xiao Bo 21 Abstract Hydrodynamic cavitation is a new technique in wastewater treatment. The degradation of rhodamine B has been studied on a hydrodynamic cavitation set-up using multiple hole orifice plates. The experimental results showed that rhodamine B is really decomposed by hydrodynamic cavitation. There are the optimal geometric parameters and operating conditions in the system and the degradation rate of rhodamine B increaseswith decreasing the value of the modified cavitation number. 2 ENVIRONMENTAL ENGINEERING Vol. 25, No. 2,Apr. ,2007