摘要:本次畢業(yè)設(shè)計(jì)的題目為某污水處理廠設(shè)計(jì)——氧化溝工藝。主要任務(wù)是工藝流程選擇及構(gòu)筑物設(shè)計(jì)和計(jì)算。

　　　該污水處理廠工程，總規(guī)模達(dá)到4萬噸/日。該污水廠的污水處理流程為：從泵房到沉砂池，進(jìn)入氧化溝，二沉池，最后出水；污泥的流程為：從二沉池排出的剩余污泥首先進(jìn)入濃縮池，進(jìn)行污泥濃縮，然后進(jìn)入消化池，經(jīng)過消化的污泥再送至帶式壓濾機(jī)，進(jìn)一步脫水后，運(yùn)至垃圾填埋場(chǎng)。出水執(zhí)行國家污水綜合排放標(biāo)準(zhǔn)（GB8978-1996）一級(jí)標(biāo)準(zhǔn)。

　　　工藝主要特點(diǎn)：1）工藝流程短，構(gòu)筑物和設(shè)備少，不設(shè)初沉池，調(diào)節(jié)池和單獨(dú)的二沉池，污泥自動(dòng)回流，投資省，能耗低，占地少，管理簡(jiǎn)便。2）處理效果穩(wěn)定可靠，其BOD5和SS去除率均在90％-95％或更高。COD得去除率也在85％以上，并且硝化和脫氮作用明顯。3）產(chǎn)生得剩余污泥量少，污泥不需小孩，性質(zhì)穩(wěn)定，易脫水，不會(huì)帶來二次污染。4）造價(jià)低，建造快，設(shè)備事故率低，運(yùn)行管理費(fèi)用少。5）固液分離效率比一般二沉池高，池容小，能使整個(gè)系統(tǒng)再較大得流量和濃度范圍內(nèi)穩(wěn)定運(yùn)行。6）污泥回流及時(shí)，減少污泥膨脹的可能。

關(guān)鍵詞：氧化溝工藝，二沉池，國家標(biāo)準(zhǔn)

Abstract:

　　　The sewage treatment plant project, the total amount to 40,000 tons / day. The wastewater treatment plant sewage treatment process : from the pumping station to Grit Chamber, enter oxidation ditch, two sedimentation tank, the final effluent; Sludge Process : two from the settling tank discharge of the first to reach the remaining sludge thickening tank, sludge thickening, and then enter Digester, After digestion of sludge sent to the belt filter presses, and further dehydration, transported to the landfill. Implementation of the national sewage effluent discharge standards (GB8978-1996) 1 standard.

　　　the main characteristics in pond in reaction:1)The craft process is short, the builds the thing is little with the equipments, do not establish the beginning sink the pond, regulating the pond with lone of two sink the pond, automatic reflux in dirty mire, investment province, can consume low, cover little, manage simple.2)Handle the result stability is dependable, its BOD5 does away with the rate with the SS all in 90%-95% or higher.The COD have to  away with the rate too above 85%, and the nitric turns with take off the nitrogen function obviously.3)Creation the dirty amount of mire in surplus is little, the dirty mire do not need the child, the kind is stable, easy dehydration, can't bring to pollute two time4)Build the price low, construct quick, the equipments trouble rate is low, circulating the administrative expense little.5)The liquid separates efficiency ratio general two sink the pond high, the pond permits small, can make whole system been bigger again get the discharge stabilize the movement with density scope inside.6)Dirty mire reflux on time, the possibility that reduce the dirty mire the inflation.

Key words：The craft of oxidation ditch，digestion tank，National standard