本文關鍵詞： 氧化溝工藝 提標改造 方案比較 深度處理　出處：《安徽建筑大學》2017年碩士論文　論文類型：學位論文

【摘要】：本文以安徽六安市城北污水處理廠實際運行工藝為研究對象,采用生物法氧化溝工藝處理生活污水,該廠于1999年籌建,于2003年運行,設計處理能力為8萬噸/天,設計出水水質(zhì)達到《城鎮(zhèn)污水處理廠污染物排放標準》(GB18918-2002)中的二級標準。隨著城區(qū)的不斷擴張,城區(qū)管網(wǎng)分流制的改造,污水污染物濃度會大幅提升,嚴重影響現(xiàn)有工藝出水水質(zhì),尤其是氮磷污染物指標。因此,該廠有必要進行技術升級改造。通過對城市排水現(xiàn)狀及污水廠運行情況的調(diào)查分析,以及污水廠進出水水質(zhì)指標的檢測,發(fā)現(xiàn)該廠目前仍能正常運行,出水水質(zhì)指標基本能夠滿足原設計標準。實測進水水質(zhì)為:化學需氧量(COD)202.1mg/L、生物需氧量(BOD)92.4 mg/L、懸浮固體(SS)127.67 mg/L、氨氮9.8 mg/L,目前仍在設計進水水質(zhì)范圍內(nèi)。針對該水廠的實際運行現(xiàn)狀,分析該水廠目前在水質(zhì)、工藝、設備和運行方面存在的相關問題,并提出了相應的改造方案。一是對原有的氧化溝工藝進行改造,增加多點進水,增加反硝化段的碳源濃度,強化反硝化脫氮;二是增加二沉池出水深度處理工藝;三是更換污水廠原有部分設備,增加污泥一體化深度脫水設備;四是升級污水廠原有控制軟件和硬件系統(tǒng)。經(jīng)過對生化處理、深度處理工藝、污泥深度脫水工藝、消毒工藝、化學除磷藥劑、除臭工藝等方面的優(yōu)化選擇,確定了生化處理選擇多點進水強化脫氮氧化溝工藝,深度處理選擇二沉池出水+微絮凝過濾+消毒工藝,污泥處理選擇一體化污泥深度脫水技術,化學除磷選擇聚合氯化鋁后置沉淀的投藥方式,除臭工藝選擇活性氧離子法除臭技術。經(jīng)過改造后,對出水水質(zhì)進行統(tǒng)計調(diào)研,發(fā)現(xiàn)出水有機污染物、氮磷、懸浮物的去除效果均有不同程度提高,COD去除率明顯升高,達到到89%以上,BOD去除率達到91%以上。出水氨氮穩(wěn)定在0.5mg/L以下,總氮含量在10mg/L以下出水總磷含量穩(wěn)定在0.5mg/L以下,總磷的去除率穩(wěn)定在90%以上,出水SS濃度穩(wěn)定在5mg/L以下,各項指標均滿足一級A標準。
[Abstract]:In this paper, the actual operation process of Chengbei sewage treatment Plant in Lu'an City, Anhui Province, was studied. The biological oxidation ditch process was used to treat domestic sewage. The plant was set up on 1999 and operated on 2003. The designed treatment capacity was 80,000 tons per day. The designed effluent quality is up to the second class standard in the "discharge Standard of pollutants in Urban sewage treatment Plant" (GB18918-2002). With the continuous expansion of the urban area and the transformation of the distribution system of the urban pipe network, the concentration of the pollutants in the sewage will be greatly increased. The effluent quality of the existing process is seriously affected, especially the nitrogen and phosphorus pollutant index. Therefore, it is necessary for the plant to carry out technical upgrading and renovation. Through the investigation and analysis of the present situation of urban drainage and the operation of the wastewater treatment plant, As well as the inspection of the water quality index of the sewage treatment plant, it is found that the plant can still operate normally at present. The effluent water quality index can basically meet the original design standard. The actual influent water quality is: chemical oxygen demand 202.1 mg / L, biological oxygen demand 92.4 mg / L, suspended solid state SS 127.67 mg / L, ammonia nitrogen 9.8 mg / L, at present still within the scope of the design of the influent water quality. The problems existing in water quality, process, equipment and operation of the water plant are analyzed, and the corresponding retrofit scheme is put forward. One is to improve the original oxidation ditch process by increasing the multi-point influent and increasing the carbon source concentration in denitrification stage. Strengthening denitrification and denitrification, adding advanced treatment process of secondary sedimentation tank effluent, replacing the original equipment of wastewater treatment plant, increasing sludge integrated deep dewatering equipment; Fourth, upgrade the original control software and hardware system of the wastewater treatment plant. After optimizing the selection of biochemical treatment, advanced treatment process, sludge deep dewatering process, disinfection process, chemical phosphorus removal agent, deodorization process, etc. It is determined that biochemical treatment selects multi-point influent enhanced denitrification and oxidation ditch process, advanced treatment selects secondary sedimentation tank effluent micro-flocculation filtration and disinfection process, and sludge treatment selects integrated sludge depth dewatering technology. The chemical phosphorus removal method was used to select the way of post-precipitation of polyaluminium chloride, and the deodorization technology was selected to deodorize by reactive oxygen species ion method. After the modification, the effluent quality was investigated statistically, and the organic pollutants, nitrogen and phosphorus were found out in the effluent. The removal efficiency of suspended solids was increased to different extent, reaching to more than 89%, the removal rate of bod was more than 91%. The ammonia nitrogen in effluent was below 0.5 mg / L, the total nitrogen content was below 10 mg / L, and the total phosphorus content in effluent was below 0.5 mg / L. The removal rate of total phosphorus is more than 90%, the SS concentration of effluent is below 5 mg / L, and all the indexes meet the first class A standard.
【學位授予單位】：安徽建筑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X703

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