The invention relates to environmental protection technology and a new method for treating domestic sewage. There are some problems in the treatment of domestic sewage by existing processes, such as the competition of carbon source for anaerobic phosphorus release and denitrification, the contradiction of metabolic cycle of nitrifying bacteria, heterotrophic bacteria and phosphorus accumulating bacteria, the competition of nitrifying bacteria and heterotrophic bacteria for oxygen, and the high energy consumption, high cost and troublesome operation. The steps of the invention are as follows: domestic sewage enters the anaerobic tank, the sludge-water mixture enters the sedimentation tank, the supernatant of the sedimentation tank flows to the aerobic biofilm nitrification tank by itself, and the sludge is aerated for oxygen supply, the sludge exceeds the anoxic tank, the sludge-water mixture of the anoxic tank enters the sedimentation tank, the supernatant liquid of the sedimentation tank is discharged, and the sludge flows back to the anaerobic tank. The effluent meets the first-class A discharge standard of the National Discharge Standard for Pollutants from Urban Sewage Plants (GB18918 2002). The invention has the advantages of good sewage treatment effect, no additional carbon source is needed, low energy consumption, low process construction cost and convenient operation, environmental protection and water environment quality improvement.
【技术实现步骤摘要】
一种生活污水处理的新方法
本专利技术涉及环境保护技术,具体地说是一种生活污水处理的新方法。
技术介绍
随着经济的快速发展,水体富营养化的现象也愈发严重,如巢湖、太湖和滇池。氮、磷元素是引起水体富营养化的两个重要因子,许多国家对其排放浓度都有着严格限制。我国国家环境保护部要求城镇污水处理厂出水排入重点流域及湖泊、水库等封闭、半封闭水域时,必须严格执行《城镇污水处理厂污染物排放标准》(GB18918-2002)的一级A标准。为了生活污水处理氮和磷的达标排放,各地加速城镇污水处理厂建设或升级改造的步伐,应用最广泛的是厌氧/缺氧/好氧(Anaerobic-Anoxic-Oxic,A2O)工艺。该工艺的主要优点是:(1)可在常规活性污泥法的基础上改造而成,改造简便易行;(2)抗冲击负荷能力较强;(3)在碳充足的情况下,出水水质较好。然而,长期以来,我国城镇生活污水C/N比较低,有高达65%以上的污水处理厂存在碳源不足的现象,近43%的污水处理厂的进水C/N小于3,污水中碳源已不能满足微生物脱氮除磷的需要。因此,采用A2O工艺处理生活污水时,通常存在这一突出问题:反硝化脱氮和除磷微生物对碳源的竞争,由于城市污水的碳源普遍偏低,难以满足脱氮除磷的需求,因此处理后的污水氮和磷难以达到排放标准。此外,这一个工作还存在如下缺点:不同污泥龄(SolidsRetentionTime,SRT)微生物共存对氮和磷去除的不利影响,聚磷菌的世代时间较短,在SRT较短的条件下可正常生长,并可获得较高的除磷效率,而硝化细菌属于自养型专性好氧细菌,它的生长速度缓慢,世代时间较长,在SRT较长的 ...
【技术保护点】
1.一种生活污水处理的新方法,步骤如下:(1)生活污水进入厌氧池;(2)厌氧池泥水混合液进入沉淀池;(3)沉淀池上清液自流至好氧生物膜硝化池,同时进行曝气提供溶解氧(Dissolved Oxygen,DO),沉淀污泥超越至缺氧池;(4)缺氧池泥水混合液进入沉淀池;(5)沉淀池上清液排放,沉淀污泥回流至厌氧池。
【技术特征摘要】
1.一种生活污水处理的新方法,步骤如下:(1)生活污水进入厌氧池;(2)厌氧池泥水混合液进入沉淀池;(3)沉淀池上清液自流至好氧生物膜硝化池,同时进行曝气提供溶解氧(DissolvedOxygen,DO)...
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