英语翻译摘要本设计为沈阳地区日处理量45万吨的城市污水工艺计算.进水水质：BOD5=200mg/l,SS=250mg/l,30mg/l；重金属及有毒物微量.设计出水水质：BOD5=30mg/l,SS=27mg/l,18mg/l去除率分别为：BOD5=85%,SS=85

Question

英语翻译
摘要
本设计为沈阳地区日处理量45万吨的城市污水工艺计算.进水水质：BOD5=200mg/l,SS=250mg/l,30mg/l；重金属及有毒物微量.设计出水水质：BOD5=30mg/l,SS=27mg/l,18mg/l去除率分别为：BOD5=85%,SS=85%,40%.
设计拟采用传统活性污泥法（普通活性污泥法）.传统活性污泥法是活性污泥最早的形式,又称普通活性污泥法.该工艺的特点是：①处理效果好：BOD5的去除率可达90-95%；②对废水的处理程度比较灵活,可根据要求进行调节.传统活性污泥法是一种低成本高效能的污水处理方式,能够高效去除有机物,停留时间长的活性污泥法还具有硝化功能.
传统活性污泥法工艺的主要构筑物有：格栅、沉砂池、沉淀池、反应池以及污泥处理系统等组成.具体构筑物及设备介绍如下：
1 粗格栅
粗格栅的作用是去除粗大的悬浮物,防止堵塞水泵机组及管道阀门,保证后续处理设施能正常运行.本设计拟采用两组机械格栅,其中一组备用.过栅流速：1.0m/s；栅条间距：100mm；选用PZ2500型高链式格栅除污机.
2 中格栅
中格栅的作用与粗格栅类似,主要拦截废水中的较大颗粒和漂浮物,以确保后续处理的顺利进行.设计采用五组（两组备用）.过栅流速：0.8m/s；栅条间距：20mm；选用GH-1600型链条回转格栅除污机.
3 细格栅
细格栅的作用是进一步去除污水中的悬浮物.采用八组（两组备用）.过栅流速：0.7m/s；栅条间距：10㎜.选用XWB-Ⅲ-1.5-2.5型号背耙式格栅除污机.
4 沉砂池
采用廊道式曝气沉砂池,其特点是可减少后续处理的难度.进入沉砂池污水水平流速：0.09m/s；停留时间：6min；曝气设备拟采用7组RD－125 罗茨鼓风机（2组备用）；采用重力排砂,排砂设备采用行车泵式吸砂机PXS3500型.
5 曝气池
曝气池采用旋转推流式,拟建设六座,单池容积达2000m3,泥龄为6.67d,曝气设备采用BER型无滑轨37-BER水下射流曝气机五台（两组备用）.BOD5去除率可达85%以上.
6 沉淀池
本次设计中初沉池及二沉池均采用圆形辐流式沉淀池.具体为：初沉池为六座,单池池径为44m；二沉池为12座,单池池径为40m.沉淀池有效水深分别为5m和4.5m.二池刮泥机为ZG—45型周边传动刮泥机和中心传动双臂式刮吸泥机.
7 污泥浓缩池
设计采用圆形辐流式重力浓缩池.其特点是可连续运行、构造简单,操作方便、动力消耗小,运行费用低、贮存污泥能力强等.浓缩时间为24h、有效水深为5m、浓缩池固体通量M=30kg/m •d,浓缩后含水率为97%.
8 污泥消化池
本设计采用柱型消化池,一级,二级消化池采用相同池型,其中一级消化池四座,二级消化池两座.消化池直径D采用28.5m,集气罩直径d1=3m,高h1=2.5m,池底锥底直径d2=3m,消化池柱体高度为20m.一级消化池与二级消化池的停留时间比为2：1
9 污泥脱水
设计采用带式脱水机三台（一台备用）.型号：DY—3000型带式压榨过滤机.
带式压滤脱水机受污泥负荷波动的影响小,还具有出泥含水率较低且工作稳定消耗少、管理控制相对简单、对运转人员的素质要求不高等特点.
经过以上工序的处理,排水可达到城市污水二级排放标准(GB8978-1996),满足设计要求.
关键词：传统活性污泥法（普通活性污泥法）；曝气沉砂；推流式曝气池；辐流式沉淀池； 污泥浓缩；污泥消化；污泥脱水.

Answer 1

The design of the Shenyang processing capacity of 450,000 tons of urban sewage calculation.Influent water quality :BOD5 = 200 mg / l,SS = 250 mg / l and 30 mg / l; heavy metals and toxic trace.Design effluent quality := BOD5 30 mg / l,SS = 27 mg / l,18mg / l removal :BOD5 = 85%,SS = 85%,40%.Design of the proposed traditional activated sludge (conventional activated sludge process).Traditional activated sludge activated sludge is the earliest form,also known as the conventional activated sludge process.The process is characterized by :① good effect :the removal of BOD5 up to 90 -95%; ② the wastewater treatment is relatively flexible and can be adjusted according to demand.Traditional activated sludge is a low-cost high efficiency of the sewage treatment method to efficiently remove organics,stay long Activated Sludge Process Nitrification is also functional.Conventional Activated Sludge Process of the main structures :the grid,the Grit Chamber,sedimentation tanks,tank and the sludge handling system components.Concrete structures and equipment as follows :a coarse grid coarse grid role is to remove coarse particles.prevent the pump unit and plug the pipeline valves,and ensure follow-up treatment facilities to normal operation.The design of the proposed use of two mechanical Grille,a group standby.Guo gate speed :1.0 m / s; Rack spacing :100mm; Selection PZ2500 high chain - grate discharge machine.2 grid grid with the role of coarse grid similar to the main wastewater interception of the larger particles and floating objects.follow-up to ensure the smooth handling.Designed with five (two standby).Guo Gate velocity :0.8m / s; Rack spacing :20mm; Selection of GH-1600-Rotary Grille chain decontamination machine.3 small grid of fine grid role is to further remove sewage suspensions.Using eight (two standby).Guo gate speed :0.7 m / s; Rack spacing :10 mm.Selection XWB-III models -1.5-2.5 back rake grid decontamination machine.4 Grit Chamber adopted gallery Aerated Grit Chamber,which was characterized by the follow-up treatment can reduce the difficulty.Grit Chamber of sewage into the level of velocity :0.09 m / s; Residence Time :6 min; aeration equipment used to be seven groups RD-125 Roots Blower (Group 2 standby); using gravity sand,sand road equipment used sand suction pump-type machine PXS3500.5 aeration tank aeration tanks used rotary push type,to be built six,single-cell volume up to 2000m3.SRT to 6.67 d,aeration equipment used BER-type slide 37-BER underwater jet aerators 5 (two standby).BOD5 up to 85% more.6 sedimentation tank design of this early Shen Shen pool and two ponds were used circular spokes flow sedimentation tank.In particular :the primary settling tank for six,single-cell pool diameter of 44 m; 2 Shen pool of 12,single-cell pool of 40 m diameter.Sedimentation tanks effective depth of 5 m and 4.5 m.2 Mud pool scratching for ZG-45 drive-scratching surrounding Mud Center Drive arms and Scraper dredger.7 sludge thickening tank designed with circular spokes-flow gravity concentration pool.Its characteristics are continuously operational,simple structure,convenient operation,small power consumption,low operating costs,sludge storage capabilities,and so on.Concentration for 24 h,the effective depth of 5 m,the concentration of solid flux pool M = 30kg / m • d,concentrated moisture content of 97%.8 sludge digestion Ikemoto designs columnar Digester,one,two Digester use the same pool type,Digester with a four,two Digester 2.Digester D diameter 28.5 m used to collect gas masks diameter d1 = 3m,h1 = 2.5m high,bottom end cone diameter d2 = 3m,Digester cylinder height of 20m.Digester with a two Digester stayed for more than two hours :1 9 sludge dewatering belt design using three dewatering machine (a standby).Model :DY-3000-belt press filter.Belt filter press sludge dewatering were affected by the fluctuations in the load small,but also up the soil moisture content is low consumption of less stable work,management control is relatively simple to operate,low quality of the features.With the above processes,drainage can be achieved two urban sewage discharge standards (GB8978-1996).meet the design requirements.Keywords :traditional activated sludge (conventional activated sludge process); Aeration sand; Plug-Flow pond; Radial flow Carpenter Love Da Wu?sludge thickening; Sludge digestion; Sludge Dewatering