江南某多产业并存型小城镇污水处理设计研究

发布时间：2018-03-04 09:31

本文选题：江南　切入点：多产业并存型小城镇　出处：《苏州科技学院》2015年硕士论文　论文类型：学位论文

【摘要】：小城镇的发展逐渐趋向于多产业并存型,在多种工业企业迅猛发展的同时,其水环境污染问题也日益突出,尤其是在江南河网水系密集地区更为明显,已经引起当地政府和群众的高度重视。污水处理厂是城镇污水处理的最后一道关口,科学地确立设计标准和选择工艺流程不仅从根本上影响城镇污水处理厂出水水质是否达标,而且对污水处理设施建成后的运行稳定性、维护管理费用也有深刻的影响。由于多产业并存型小城镇的污水特性更为复杂不一,对其污水处理系统的工艺设计提出了更高的要求。本课题选择典型江南地区多产业并存型小城镇——昆山市巴城镇石牌工商区石牌污水处理厂二期改扩建工程设计展开研究,包括石牌污水处理厂一期工程的运行现状分析,二期工程水量的确定、进水水质论证分析、二期处理工艺的比选及设计参数优化、一期处理构筑物改造设计,最终完成工程设计。石牌污水处理厂的来水包括生活污水和多种工业为主的工业废水,生活污水与工业污水水量比例为4:6,设计流量为1.2万m3/d,其中一期0.5万m3/d,二期0.7万m3/d。根据石牌污水厂一期工程2012~2013年进水水质监测数据,确定设计进水水质主要指标BOD5、COD、SS、TN、NH3-N、TP依次为:220mg/L、400mg/L、200mg/L、35mg/L、25mg/L、5.5mg/L。按照《太湖地区城镇污水处理厂及重点工业行业主要水污染物排放限值》(DB32/1072-2007)限值标准,确定污水厂出水指标执行一级A类标准,处理后的水最终排放到茆沙塘。通过技术经济比较,最终二期工程污水处理工艺采用机械预处理——水解酸化——CASS生物处理——深度处理组合工艺;污泥采用厌氧发酵、重力浓缩、压榨脱水的处理工艺。针对污水处理厂进水水质变化复杂等实际情况,对传统设计参数进行优化调整。以CASS工艺为核心工艺并进行详细的工艺设计,总结出了一套具有参考价值的设计参数。其中主要构筑物水解酸化池设计水量:1.2万m3/d,有效容积:5000m3,停留时间8h,尺寸:28.0x25.0x7.7(H)m;CASS生物池为一座合建式综合池,由生物选择区、兼氧区和主反应区三部分组成,分为4组。CASS反应池容积比厌氧区:缺氧区:主反应区=1:5:30,设计污泥负荷0.15 kg BOD5/kg MLSS·d,混合液浓度3500mg/L,污泥龄20d,污泥回流比30%~50%。CASS池反应区总有效池容V=4666m3;单格有效容积V单=1167m3。CASS反应池单池设计尺寸:L×B×H=30.0×8.0×6.0m;有效水深5.0m;滗水高度1.25m。最后从工程经济、能耗和环保三方面对工程效益进行了分析。石牌污水处理厂在改造期间,保证了一期工程的稳定运行,二期工程调试出水水质也稳定达标,运行数据表明,污水处理系统对BOD5、COD、SS、NH3-N和磷具有较好的去除效果,各项指标均满足《太湖地区城镇污水处理厂及重点工业行业主要水污染物排放限值》(DB32/1072-2007)限值标准,而且具有较高的耐冲击负荷能力。处理系统每年可削减COD 1635吨、SS 902吨、NH3-N 127吨、总磷18吨以上。以CASS工艺为核心的机械预处理——水解解酸化——CASS生物处理——深度处理工艺适用于河网密集地区的多产业并存型小城镇污水的处理,针对石牌污水处理厂进行的工艺参数调整是成功的,设计经验可为同类型城镇污水厂提供参考和借鉴。
[Abstract]:The development of small towns tend to coexist in a variety of industries, the rapid development of the industrial enterprises at the same time, the water pollution problems have become increasingly prominent, especially in the south of the Yangtze River water network intensive areas is more obvious, has attracted great attention of the local government and the masses. The sewage treatment plant is the last step of urban sewage treatment the establishment of scientific design standards and the selection process is not only fundamentally influence whether the standard of urban sewage treatment plant effluent quality and operation stability of the completion of the sewage treatment facilities, maintenance costs also have a profound effect. Because the sewage industry characteristics of small towns is more complex and more forward higher requirements on the sewage treatment system process design. This paper chooses multi industry typical Jiangnan region coexist small town - Kunshan City Shipai Shipai town business district. Plant two expansion project design of water treatment, including the analysis of the status quo of a project Pai sewage treatment plant, the two phase of the project to determine the water, water quality analysis, two stage treatment process selection and optimization of design parameters, a building renovation design, the final completion of water engineering design. The sewage treatment plant on sewage and industrial wastewater including various industries, domestic sewage and industrial sewage water ratio of 4:6, the design flow is 12 thousand m3/d, including a 5 thousand m3/d, two m3/d. 7 thousand according to the 2012~2013 project of sewage treatment plant in Shipai influent water quality monitoring data, determine the design influent water quality indices BOD5 COD, SS, TN, NH3-N, TP were: 220mg/L, 400mg/L, 200mg/L, 35mg/L, 25mg/L, 5.5mg/L. in accordance with the "Taihu area factory and key industries of urban sewage treatment and water pollutant emission limit value > ( DB32/1072-2007) limit standard, determine the sewage plant effluent indicators perform a class standard, the treated water is exhausted to Mao Sha Tang. By comparison of technology and economy, the final phase two project of sewage treatment process using mechanical pretreatment, hydrolysis acidification and CASS biological treatment -- combination of advanced treatment process; sludge by anaerobic fermentation, gravity concentration treatment process, squeeze dewatering. For the sewage treatment plant influent water quality change the complexity of the actual situation, to adjust and optimize the traditional design parameters. Using CASS technology as the core technology and the detailed design process, a set of reference value of design parameters is summarized. The main structures of the hydrolytic acidification tank design of water: 12 thousand m3/d, the effective volume: 5000m3, time 8h, size: 28.0x25.0x7.7 (H) m; CASS is a biological tank combined integrated tank by biological selection area, anoxic zone and the main counter Should be composed of three parts, divided into 4 groups of.CASS reactor volume ratio of anaerobic zone: anoxic zone: =1:5:30 the main reaction zone, the design of BOD5/kg MLSS sludge load of 0.15 kg - D, the concentration of the mixture was 3500mg/L, sludge age 20d, sludge reflux ratio 30%~50%.CASS pool pool total effective reaction zone containing V=4666m3 cells; effective volume V single =1167m3.CASS the design of single reaction tank pool size: L * B * H=30.0 * 8 * 6.0m; effective depth 5.0m; decanting height 1.25M. finally from the engineering economy, energy consumption and environmental protection three aspects of the analysis of the benefits of the project. Pai sewage treatment plants in the transformation period, to ensure stable operation of the first phase of the project, the two phase of the project commissioning of water the water quality is stable and standard, operation data show that the sewage treatment system of BOD5, COD, SS, NH3-N and phosphorus has good removal effect, the indicators meet the < Taihu sewage treatment plants and key industries of major water pollutant discharge limits Value > (DB32/1072-2007) standard limit, but also has high resistance to impact load. The annual processing system can reduce COD SS 1635 tons, 902 tons, 127 tons of NH3-N, total 18 tons. To CASS technology as the core of the mechanical pretreatment solution hydrolysis acidification CASS biological treatment - treatment technology in depth brooky area multi industry small town sewage treatment process parameter adjustment for Pai sewage treatment plant is successful, design experience can provide reference for the same type of urban sewage treatment plant.

【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

【参考文献】