【正文】
該工程可采用生物法對污水進行處理。DE型氧化溝和三溝式氧化溝在中高濃度的中小型城市污水處理中也有應用[17]。(4)氧化溝工藝:氧化溝是通過定向控制的曝氣和攪動裝置,攪動的混合液在氧化溝閉合渠道內(nèi)水平循環(huán)流動。A/O工藝流程簡單、占地少、不需外加碳源脫氮,易于控制污泥膨脹,投資和運行費用較低,在我國污水廠中廣泛使用。(1)AB改進工藝:AB污水處理工藝,即生物吸附生物降解兩段活性污泥法,80年代初開始在我國應用于工程實踐。其對應的去除率為CODCr≥84%,BOD5≥80%,NH3N≥%,磷酸鹽(以P計)≥90%。最后完成設計計算說明書和設計圖。污泥處理工藝選擇中溫厭氧消化處理,能達到污泥穩(wěn)定的目的。其對應的去除率為CODCr≥84%,BOD5≥80%,NH3N≥%,磷酸鹽(以P計)≥90%。設計深度為初步設計的深度。設計總說明隨著經(jīng)濟快速發(fā)展和城市化程度越來越高,中心城區(qū)和小城鎮(zhèn)建設步伐不斷加快,城市生活污水對城區(qū)及附近河流的污染也越來越嚴重。最后完成設計計算說明書和設計圖。出水水質(zhì)達到廣東省地方標準《水污染物排放限值(DB44/262001)》第二時段第二類污染物最高允許排放濃度一級標準,污水經(jīng)二級處理后應符合以下具體要求:CODCr≤40mg/L,BOD5≤20mg/L,NH3N≤10mg/L,磷酸鹽(以P計)≤。本設計的污水處理工藝選擇phoredox(改良的Bardenpho)除磷脫氮工藝,經(jīng)處理后,污水的主要污染指標全部達到排放標準的要求。s living environment, the local governments vigorously invest money, trying to change the current water quality.This design is about a secondary municipal wastewater treatment plant. It is required to design the size of the main structures and determine the plant’s layout and height layout, finish the design of brochure, drawings finally. The level of the design is preliminary. The wastewater’s capacity is 50000m3/d. The quality of the influent water is250mg/L of the CODcr, 100mg/L of the BOD5, 30mg/L of the Ammonia nitrogen, 5 mg/L of the Phosphate. The quality of the discharged water can meet the Guangdong province emission limits of municipal sewage. The quality of the effluent water is ≤40mg/L of the CODcr, ≤20mg/L of the BOD5, ≤10mg/L of the Ammonia nitrogen and ≤≥84% of the CODcr,≥80% of the BOD5,≥% of the Ammonia nitrogen, ≥90% of the Phosphate.With the study of the characteristic of municipal sewage, and in the light of the successful experience of internal and external use of A2/O process to treat municipal sewage, because A2/O process can remove BOD5, SS, and Ammonia and nitrogen existed in any forms, meet the need of this project in the area of land, in the quality of the effluent water of this project, A2/O process is adopted in the design. Basic process is: Sand Traps→ Grit Chamber→ Anaerobic pool→ Hypoxia pool→ Aerobic pool→ Hypoxia pool→ Aerobic pool→ Secondary Sedimentation Tanks→ Disinfection → Discharge.We select phoredox nitrogen and phosphorus removal process as sewage treatment process. After the sewage being treated, the main indicators of pollution emission meet the standards to the requirements. Temperature in the anaerobic digestion is chosen as sludge treatment process, it can achieve the objective of the stability of sludge. Activated carbon adsorption deodorant is chosen as stench process.Key words: Municipal sewage, A2/O process, Nitrogen and Phosphorus Removal目 錄1. 緒論……………………………………………………………………………………….1 設計任務和內(nèi)容……………………………………………………………………..1 基本資料……………………………………………………………………………..1 污水水量與水質(zhì)………………………………………………………………1 處理要求………………………………………………………………………12. 處理工藝選擇和流程說明…………………………………………….…………………2……………………………………………………...2 污泥處理工藝選擇和流程說明……………………………………………………..4 惡臭處理工藝選擇和流程說明……………………………………………………..53. 污水處理構(gòu)筑物設計…………………………………………………………………….6 格柵間………………………………………………………………………………..6 設計說明………………………………………………………………………6 設計計算………………………………………………………………………6 機械設備選型…………………………………………………………………8…………………………………………………………………………...8 設計說明………………………………………………………………………8 設計計算及機械設備選型……………………………………………………8 沉砂池………………………………………………………………………………..9……………………………………………………………………….9 設計計算………………………………………………………………………9 機械設備選型………………………………………………………………..10 A2/O池…………………………………………………………………………….11……………………………………………………………………...11 設計計算……………………………………………………………………..11 機械設備選型………………………………………………………………..18 二沉池………………………………………………………………………………20 設計說明……………………………………………………………………..20 設計計算……………………………………………………………………..20………………………………………………………………...22 消毒接觸池…………………………………………………………………………22 設計說明……………………………………………………………………..22 設計計算及機械設備選型…………………………………………………..224. 污泥處理構(gòu)筑物設計……………………………………………………………………24 剩余污泥泵房………………………………………………………………………24 設計說明……………………………………………………………………..24 設計選型……………………………………………………………………..24 污泥濃縮機…………………………………………………………………………24 設計說明……………………………………………………………………..24 設計選型……………………………………………………………………..25 污泥消化池…………………………………………………………………………25 設計說明……………………………………………………………………..25 設計計算……………………………………………………………………..25 機械設備選型………………………………………………………………..28 污泥脫水系統(tǒng)………………………………………………………………………285. 惡臭氣體的處理計算…………………………………………………………………..30 設計說明……………………………………………………………………………30 設計計算……………………………………………………………………………31 機械設備選型………………………………………………………………………326. 污水廠總體布置………………………………………………………………………..33………………………………………………………….33 污水廠平面布置……………………………………………………………………35 污水廠高程布置……………………………………………………………………36………………………………………………………………………………….38……………………………………………………………….38……………………………………………………………………………388勞動定員與運行費用…………………………………………………………………….40…………………………………………………………………………….40…………………………………………………………………………….40…………………………………………………………...40………………………………………………………………...40…………………………………………………………………...41結(jié)論………………………………………………………………………………………….42參考文獻…………………………………………………………………………………….43致謝………………………………………………………………………………………….451. 緒 論 設計任務和內(nèi)容根據(jù)所給資料設計一座二級處理城市污水處理廠,要求對其主要污水處理構(gòu)筑物的工藝尺寸進行設計計算,確定污水廠的平面布置和高程布置。 處理要求根據(jù)廣東省地方標準《水污染物排放限值(DB44/262001)》第二時段第二類污染物最高允許排放濃度一級標準,污水經(jīng)二級處理后應符合以下具體要求:CODCr≤40mg/L,BOD5≤20mg/L,NH3N≤10mg/L,磷酸鹽(以P計)≤。可供選擇的工藝有:(1)AB改進工藝,(2)A/O工藝,(3)A2/O工藝,(4)氧化溝工藝,(5)SBR及其改進工藝等。也有部分A/O工藝以缺氧/好氧方式運行,通過硝化菌和反硝化菌實現(xiàn)脫氮。A2/O工藝是我國最常用的同步除磷脫氮工藝,運行狀況均較好。采用Carrousel氧化溝工藝的城市污水處理廠大部分為外貸項目。工藝分析選擇:該污水處理廠污水進水水質(zhì)BOD5/COD=,屬于易生物降解范疇。A2/O工藝的主要特點:①厭氧池在前、好氧池在后,有利于抑制絲狀菌的生長,混合液的SVI小于100,污泥易沉淀,不易發(fā)生污泥膨脹,并能減輕好氧池的有