Unit 12 Wastewater Treatment.ppt

1、2020/7/25,Unit 12,1,Unit 12 Wastewater Treatment,第12单元 废水处理,2020/7/25,Unit 12,2,What courses have you learned during college?,Required/ compulsory courses: water/air/noise pollution control engineering; solid waste treatment Questions: What is wastewater treatment? How many types were the wastewater

2、 treatment divided to ? What is the current status in wastewater treatment?,2020/7/25,Unit 12,3,第一部分：课文阅读,一、the 1st para. 1. the 1st sentence reuseri:ju:zvt.再用, 重新使用ri:ju:sn.再用, 重新使用 ex: wastewaterreuse municipal wastewaterreuse 2. the 2nd sentence discharge permit： ex：discharge standard： discharge

3、pipe:,废水再用,城市中水回用,排放许可；排污许可证,排放标准,排水管,2020/7/25,Unit 12,4,treatment methods,二、the 2nd para. 1. the 2nd sentence the removal of sth.（N、P、COD） 去除某物质 去除率? 2. the 3rd sentence Types of wastewater treatment： （1）primary treatment： Screening： （coarse screening ） Sedimentation: （Sedimentation tank： ）,the re

4、moval rates of sth.（N、P、COD）,一级处理,筛选,粗格栅,沉淀/降,沉淀池,2020/7/25,Unit 12,5,Flotation (and skimming): （skimming tank: ） Oil separation physical Neutralization: ( reaction: ) Coagulation： Ion exchange： Ozonation: Cholorination: chemical,浮选,撇油槽,中和,中和反应,混凝,离子交换,臭氧化; 臭氧化作用,氯化消毒,2020/7/25,Unit 12,6,（2）secondar

5、y treatment（biological treatment）： 二级处理 Activated sludge process： Extended aeration（total oxidation process）： 延时曝气法 （aeration ：n. 曝气；通风, 通气 aerationtank: ） （an）aerobic treatment: Oxidation ponds: Septic tank: (septic:n.引起腐败的东西; 腐败物剂;a.腐败性的),活性污泥法,曝气池,（厌）好氧处理,氧化塘,化粪池,2020/7/25,Unit 12,7,（3）tertiary t

6、reatment（advanced treatment）： 三级处理 （physical-chemical） Microscreening： Reverse osmosis（RO）： Electrodialysis: Nutrient removal processes： (4) types of advanced wastewater treatment: Tertiary treatment Physical-chemical treatment Combined biological-physical treatment,微滤筛,反渗透,电渗析,营养物的去除（N、P）,2020/7/25

7、,Unit 12,8,3. the 4th sentence gross: 总的, 毛的 ex: gross weight： 4. the 6th sentence Suspended solid（SS）： mixed liquor suspended solid（MLSS）： 混合液悬浮固体 volatile suspended solids（VSS）： 挥发性悬浮固体 剩下内容自学：,毛重,净重:,net weight,悬浮固体,2020/7/25,Unit 12,9,第二部分：Technical Terms技术术语,biodegradable:可生物降解的 ex：biodegradabl

8、e detergent: 生物降解洗涤剂 disperse：使疏散，使分散，分散的 ex：disperse medium分散介质 flocculateflkjuleit:絮凝物 ex：non-flocculated microbes：非絮凝微生物 immobilize：使不动，使固定 im-： (用于b,m,p之前)表示“否定,与相反”之义 intermittently：间歇地，周期性地,2020/7/25,Unit 12,10,residual：剩余的，残留的；残渣，余数 ex：residual analysis: 残差分析 residual charge: 剩余电荷 hydrolysis：

9、水解作用 volatile：易挥发的;挥发物 ex：volatile matter【化】挥发分; 易挥发物 sophisticated:复杂的，尖端的，有经验的，久经世故的 ex：sophisticated weapon:尖端武器 areation tank：曝气池 continuous flow mode：连续流动模式 aerobic condition：好氧条件,2020/7/25,Unit 12,11,第三部分：长难句的翻译,1.Biooxidation of biodegradable pollutants in an aeration tank and settling of the

10、 biomass and other solid in a clarifier from whence concentrated sludge is recycled to the aeration tank in order to enhance process intensity. Whence是关系代词，from whence concentrated 是定语从句修饰clarifier, 这是介词关系代词引导的定语从句，可用关系副词where来代替from whence “可生物降解的污染物在曝气池中的生物氧化，澄清池中生物量和其他固体（污泥）的沉降，将澄清池浓缩的污泥循环进入曝气池以提

11、高这一过程的强度。”,2020/7/25,Unit 12,12,2.Biooxidation is carried out by dispersed microbial flocs with relatively good settling properties and which can,in many respects,be regarded as pellets of naturally immobilized microbial cell. with relatively good settling properties为介词短语作定语修饰flocs，which引导的定语从句也修饰fl

12、ocs “生物氧化是通过具有较好的沉降性能的分散的微生物絮凝物来进行的，这种絮凝物在很多方面被认为是自然固定的微生物细胞团。”,2020/7/25,Unit 12,13,3.Activated sludge process performance is judged on the basis of removal efficiency in terms the difference in BOD,COD,TOC,or DOC between the process feed and clarified effluent ,but the concentrations of specific p

13、ollutants are largely ignored. in terms意为“以表示”，它引导的成分是efficiency的定语 “活性污泥工艺性能以去除效率为基础来判断，这种去除效率是以过程中进料的BOD,COD,TOC或DOC与澄清池出水中的BOD,COD,TOC或DOC之间差值来表示,但特别污染物的浓度则被大大的忽略了。”,2020/7/25,Unit 12,14,4.The rates of hydrolysis and/or degradation of entrapped particulate pollutants are unlikely to be very rapid

14、 and particalarly as such processes for many common particulate pollutants can occur both aerobic and anerobic conditions,it must be assumed,for cases where degradation is incomplete in the areation tank,that it will continue to occur in the clarifier. are unlikely to be very rapid意为“未必很迅速” as such processes指代hydrolysis and/or degradation “被夹带的粒状污染物的水解与降解未必很迅速，特别是对许多普通的粒状污染物这样的过程能在好氧和厌氧两种条件下发生，应设想：对于在曝气池中降解不完全的情况，在澄清池中降解将会继续发生。”,2020/7/25,Unit