适合寒区的多点进水A~2O工艺改良及其优化设计

发布时间：2018-05-22 20:23

本文选题：寒冷地区 + 前置反硝化　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：近年来随水处理标准的提高,A~2O工艺在污水处理厂的应用中由于具有运行稳定,对自控水平的要求较低,便于管理维护的特点,相比其他自控水平要求高或控制管理复杂的污水处理工艺具有明显的优势,逐渐成为目前寒冷地区应用最多的污水处理工艺。针对传统A~2O工艺中存在的影响脱氮除磷效果的矛盾,致使A~2O工艺难以同步获得较好的脱氮除磷效果,在使用中受到限制,因此本课题针对目前最常用的A~2O脱氮除磷工艺设计优化问题,设计了一种“多点进水,混合液多点回流”的改良A~2O工艺。该工艺流程简单、运行管理方便灵活,具有分点进水和多点回流特性,提高了脱氮除磷处理效率。在课题研究中,通过小试,验证了该工艺与传统A~2O工艺对污水处理的效率,通过小试,认为该种工艺理论可行,具备工程实施的可行性,处理效率比传统工艺有较大提高,在相同的运行条件下,由于改良型A~2O工艺能在好氧区积累更多的硝化菌,提高了处理效率,改良型A~2O系统对氨氮的去除效果明显好于A~2O系统;由于改良型A~2/O工艺能在缺氧区为反硝化菌的生长繁殖提供更好的条件,由此提高了反硝化效率;改良型A~2O系统对总氮的去除效果明显好于A~2O系统。在小试的基础上,通过该工艺在东北寒冷地区某污水处理厂(规模5万吨/日)的工程实践证明:该工艺处理效果良好,抗低温冲击能力强:TP平均去除率为89.63%;出水氨氮常年＜5mg/L,且小于1mg/L比例为83.3%;总氮平均去除率为62.67%,出水平均值为12.76mg/L,最大值16.07mg/L,小于15mg/L的比例为90%。工程处理成本在污水处理行业中位于先进行列,污水处理厂投产以来,吨水运行成本＜0.35元;吨水电耗＜0.3kwh。改良A~2O工艺的改进和优化,为寒冷地区污水处理厂的建设提供了较好的工艺路线。
[Abstract]:In recent years, with the improvement of water treatment standard, the application of A2O process in wastewater treatment plant has the characteristics of stable operation, low requirement of automatic control level, and convenient management and maintenance. Compared with other sewage treatment processes with high level of automatic control or complicated control and management, it has become the most widely used wastewater treatment process in cold regions. In view of the contradiction existing in the traditional Ani2O process, which affects the effect of nitrogen and phosphorus removal, it is difficult to obtain better denitrification and phosphorus removal effect simultaneously, which is limited in use. Therefore, aiming at the most commonly used process design optimization of nitrogen and phosphorus removal, a modified Ani2O process of "multi-point influent, multi-point reflux of mixed solution" was designed in this paper. The process flow is simple, the operation management is convenient and flexible, and it has the characteristics of split point influent and multi-point reflux, and improves the efficiency of denitrification and phosphorus removal. In the course of the research, the efficiency of this process and the traditional Ani2O process for wastewater treatment is verified by small scale test. Through the small scale test, it is considered that this process is feasible in theory, feasible in engineering implementation, and the treatment efficiency is much higher than that of the traditional process. Under the same operating conditions, the improved Ani2O process can accumulate more nitrifying bacteria in the aerobic zone and improve the treatment efficiency. The improved Ani2O system has a better removal effect of ammonia nitrogen than that of the Agno _ 2O system. The improved An _ 2 / O process can provide better conditions for denitrifying bacteria growth and reproduction in anoxic zone, thus increasing denitrification efficiency, and the improved An _ 2O system has a better removal effect of total nitrogen than that of A _ (2) O _ (2) O system. On the basis of the small trial, the engineering practice of this process in a sewage treatment plant in the cold area of Northeast China (with a scale of 50,000 tons / day) proves that the process has a good treatment effect. The average removal rate of strong low temperature impact resistance is 89.63%, ammonia nitrogen in effluent is less than 5 mg / L and less than 83.3% of 1mg/L, the average removal rate of total nitrogen is 62.67 mg / L, the average value of effluent is 12.76 mg / L, the maximum value is 16.07 mg / L, and the proportion less than 15mg/L is 90 beats. The cost of engineering treatment is one of the most advanced in sewage treatment industry. Since the sewage treatment plant was put into operation, the operating cost of tons of water is less than 0.35 yuan, and the consumption of water and electricity per ton is less than 0.3 kwh. The improvement and optimization of the improved Ani2O process provide a better technological route for the construction of wastewater treatment plants in cold areas.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703.1

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