医院废水处理工艺设计(上).doc

医院废水处理工艺设计 摘要：本设计为某医院废水处理设计。该医院废水处理厂的处理水量为Q=5000t/d，不考虑远期发展。原污水中各项指标为：大肠杆菌：1200个/ L ，COD浓度：550mg/L。废水的BOD5浓度：160mg/L。废水的SS含量：250mg/L。氨氮NH3-H含量：45mg/L。污水经过处理后最终排放标准执行国家现行《污水综合排放标准》GB8978-96中一级排放标准，如下：CODcr≤60mg/L；BOD≤20mg/L；SS≤20mg/L；大肠杆菌≤500个/L ；NH3-N≤15mg/L。 目前，医院污水处理方法很多，有一级处理工艺、传统的二级处理工艺、改进替代的二级生物处理工艺及医院污水的深度处理（三级处理工艺）。这些工艺中生化—消毒联用处理技术，特别是一些先进的或替代的二级生物处理工艺倍受青睐，例如，CASS工艺、UASB法、沼气处理工艺。与常规活性污泥法相比，医院污水经CASS工艺处理后，其COD、BOD5、SS、大肠菌群等水质指标均可达到《综合污水排放标准》（GB897—1996），且投资费用低、占地面积小、运行费用少。所以,选择CASS工艺配合二氧化氯消毒工艺来处理医院污水。 关键词：医院废水，CASS工艺，二氧化氯消毒工艺 Hospital wastewater treatment process design Abstract：The design for a hospital wastewater treatment design. Design and preliminary design. The hospital wastewater treatment plant to deal with water as Q=5000t/d, do not consider the long-term development. Raw sewage indicators: Escherichia coli:1200/L, COD concentration:550mg/L. Wastewater from BOD5 concentration:160mg/L. Wastewater from SS content:250mg/L. Ammonia nitrogen content of NH3-H:45mg/L. Sewage after treatment for ultimate discharge standards of current national integrated wastewater discharge standard GB8978-96in a standard, as follows: CODcr≤60mg/L; BOD≤20mg/L;SS≤20mg/L; Escherichia coli ≤500/L; NH3-N≤15mg/L。. At present, the hospital wastewater treatment methods, including the level of processing technology, the traditional two stage processImproved or alternative, two stage biological treatment process and hospital sewage depth treatment ( three grade treatment process ) butThe vast majority of biochemical and disinfection treatment with the combination of technology, especially some advanced or replacement of two stage biological treatment popular CASS process, UASB process method, gas treatment technology and conventional activated sludge method.Hospital Wastewater by CASS process, COD, BOD5, SS, coliform and other water quality indicatorsCan achieve a comprehensive sewage discharge standard ( GB897 - 1996), and low investment cost, small occupied area,Operating cost.