毕业论文课题相关文献综述
城镇污水处理工艺综述摘要:近年来城镇经济的迅速发展,人们生活水平的提高。
原有的污水处理厂不管是在处理污水量和处理工艺已经不能满足现有的城镇污水处理了。
其中城镇污水来源广泛,水中的成分复杂,导致处理工艺复杂繁多,且生活污水的肆意排放,导致环境污染越来越严重,为了推动绿色发展,兼顾经济发展和环境保护的问题,对于城镇污水的处理必须加大力度,改善工艺使之达到排放标准。
特别是在污水处理受到气候条件的限制时(如低温条件),我们可以对污水进行一级处理和二级处理工艺进行改进以达到设计要求。
根据现在我国具备的技术的分析和可行性,一级处理工艺有:物化强化处理法,AB法前段工艺、水解好氧前段工艺、高负荷活性污泥法等技术。
二级处理包括:A2/O工艺,A/O工艺,氧化沟工艺,生物膜工艺,MBR工艺,SBR及其改良工艺等等。
关键字:一级处理,二级处理,A2/O工艺,MBR工艺,水解好氧前段工艺。
A review of sewage treatment technologyABSTRACT:In recent years, the rapid development of urban economy and the improvement of people's living standards.The original sewage treatment plant can not meet the existing sewage treatment capacity and processing technology.Including urban sewage sources, the water composition is complicated, lead to process complex is various, wanton and sewage discharge, causing the environmental pollution is more and more serious, in order to promote the development of green, give attention to both economic development and environmental protection problems, for urban sewage treatment must be increasing, improve the process to achieve discharge standard especially in wastewater treatment is limited by climate conditions (such as low temperature conditions).We can improve the primary and secondary treatment processes to meet the design requirements.According to the analysis and feasibility of the existing technologies in China, the primary treatment processes include: physicochemical enhancement treatment method,AB process hydrolysis aerobic pretreatment process, high load activated sludge process and other technologies.Secondary treatment:A2/O,A/O, Oxidation ditch process,biofilm process,MBR,SBR ,improved process and so on.KEYWORDS:primary treatment,Secondary treatment,A2/O,MBR,oxidation ditch process.一、城镇污水处理工艺1.导言城镇污水有水量大,成分复杂的特点,导致处理工艺较为复杂和繁多,如何改进现有的污水处理工艺成为了污水处理的一大难题,现有的改良工艺除了有对设备的改良,工艺的组合,还有对化学药剂的最佳选择等等。
因地制宜的选择最适的改良工艺,改进后的工艺不仅要在原有基础上达到更高的处理标准,还要符合绿色经济的原则。
水生态系统体现了人与水的和谐共存与协调发展,实现一个城市的可持续发展。
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