毕业设计（论文）-皮革废水处理工艺的初步设计精选.docVIP

皮革废水处理工艺的初步设计 （陕理工化学与环境科学学院环境工程专业1101班，陕西 汉中） 指导老师： [摘要]：制革工业生产工段繁多，加工过程中需要添加多种化学品，从而导致废水是一种成分复杂、高浓度的有机废水，主要含有COD、BOD、SS、表面活性剂、Cr6+、S2- 鞣制剂等高浓度污染物，选用科学合理的废水处理工艺尤为重要。本设计以汉中市某皮革厂废水处理为设计对象，设计处理水量为800m3/d，设计进水水质为：BOD5≤2500mg/L，CODCr≤5000mg/L，SS≤3000mg/L，S2-=30mg/L，总铬为20mg/L。本设计采用生物处理法中生物接触氧化池工艺，工艺流程为：进水-格栅-沉砂池-调节池-沉淀池-气浮-2级接触氧化-二沉池-出水，处理过程中产生的污泥通过污泥压缩，污泥脱水，最终形成饼泥外运。工艺简单可靠，操作方便，从而使出水水质达到国家《污水综合排放标准》( GB8978－1996) 中的二级排放标准。 [关键词]：制革废水 接触氧化 混凝 气浮 废水处理 reliminary design of leather waste water treatment process Li Wen (Grade 11,Class 01,Major Environmental engineering,Chemical and Environmental sciences Dept.,Shanxi University of Technology,Hanzhong ,Shanxi) Tutor:Liu Zhifeng Abstract:For?a?wide?range?of?the?production?section?of?leather?industry,?the?process?needs?to?add?a?variety?of?chemicals,?resulting?in?wastewater?is?high?concentrations?of?organics?with?complex?composition.?Mainly?containing?high?concentrations?of?pollutants?such?as?COD,BOD,SS,surfactant,Cr,?S?tanning?agents,?etc,?scientific?and?rational?choice?of?waste water treatment process?is?particularly?significant.?The design of water treatment to 800m3 / d, the design influent quality: less than or equal to 2500mg / L of BOD5,CODcr is less than or equal to 5000mg / L, the SS is equal to or less than 3000mg / L, S2-=30mg/L and total chromium is20mg/L. The design uses biological contact oxidation process of biological treatment.And the sewage treatment process was designed to be:influent - grid - sand trap - water regulating tank - sedimentation - flotation tank -biological contact?oxidation tank - secondary sedimentation tank - effluent.The process is simple and reliable, and thus resorted to water quality up to the national secondary discharge standard of Integrated Waste water Discharge Standard. Keywords:tannery?waste water ,biological contact?oxidation,coagulation,air flotation,waste water treatment 目录 6 1设计任务 7 1.1设计水质水量 7 1.2排放标准 7 1.3设计范围 7 1.4设计内容 7 1.5设计依据 7 1.6设计原则 7 7 2.1工艺流程的选择 7 2.2工艺方案的确定 9 2.