河北工程大学2004界本科生毕业设计1.docVIP

摘 要 渭南市污水处理厂处理的污水是由城市生活用水和城市工业废水以及公共建筑用水组成。其混合污水最大日设计流量为Q=113233米3/d, 日变化系数K=1.1,总变化系数为K=1.4 , 其中城市设计人口28万人，城市公共建筑污水按城市污水的30%计，工业污水量19000米3/d，设计水质经环保部门监测，污废水主要污染物COD、SS、BOD、TP、TN、NH-N以及重金属和有毒物质少量，其设计混合污水水质如下：COD=465.71mg/l , SS=243.77mg/l， BOD5=182.13mg/l，TN =45 mg/l，TP =3.49 mg/l，NH-N=34mg/l，PH=7-8，年平均温度11.5。C ，夏季最高温度为39.6。C，冬季最低温度为-21.2。C，处理厂处理水质为：BOD5≦20mg/l，CODcr≦60mg/l，SS≦20mg/l，NH3-N≦8mg/l，TP≦1.0mg/l，出水水质符合《城镇污水处理厂污染物排放标准》（GB18918-2002）中的一级B排放标准。 本设计采用DE型氧化沟处理工艺。处理构筑物主要有旋流沉砂池、DE型氧化沟、二沉池等，其主要构筑物DE型氧化沟系统是在DE型氧化沟基础上发展起来的，有2个平行的氧化沟和一个独立的沉淀池组成，处理程度大大提高，该系统可进行硝化，反硝化反应，从而达到生物脱氮的功能，在其系统前增设厌氧池则可达到除磷的目的。该系统具有高效，节能的特点，且耐冲击负荷高，出水水质好。 关键词：DE型氧化沟工艺；城市混合污水；硝化；反硝化；脱氮除磷 ABSTRACT The sewage water of WeiNans sewage treatment plants located reason is formedmainly by urban life and urban industrial waste water and public construction group using water. The Mixed sewage maximum design daily flow is 113322 m3/d. Coefficient of variation is 1.1 and changes in the total coefficient is 1.4. The urban design population is two hundreds and eighty thousands. Urban construction of urban sewage effluent by 30% in terms of industrial sewage of 19,000 m3/d. Design of water quality is monitored by environmental protection departments, the main pollutant wastewater effluent is COD, SS, BOD, TP, TN, NH-N,as well as heavy metals and small toxic substances and its design mixed effluent quality are as follows : COD = 465.71mg / l, SS = 243.77 mg / l, BOD5 = 182.13 mg / l, TN =45 mg/l，TP =3.49 mg/l，NH-N=34mg/l， pH = 7-8. The average year temperature 11.5. C , highest summer temperature of 30. Cand the lowest winter temperature of -21.2. C.The treated water : BOD5 ≦ 20 mg / l, CODcr ≦ 60 mg / l, SS ≦ 20 mg / l, NH3-N ≦ 8 mg / l, TP ≤ 1.0 mg / l.The water quality conforms to the urban sewage treatment plant pollutant discharge standards (GB18918-2002) of a B emission standards. The designs DE oxidation ditch treatment process. Dealing with the main structures stratospheric Grit C