文献翻译-预曝气-SBR工艺在生活污水处理中的应用.doc

1、外文翻译题目1：预曝气-SBR工艺在生活污水处理中的应用Title 1:Application of a pre aeration-SBR process in the treatment of sewage wastewaterApplication of a pre aeration-SBR process in the treatment of sewage wastewaterYafeng LiXinli XieMunicipal and environmental schoolMunicipal and environmental schoolShenyang Jianzhu Uni

2、versityShenyang Jianzhu UniversityShenyang, ChinaShenyang, Chinayafengli88xinlixie2005Xiaoning ZhangMunicipal and environmental school Shenyang Jianzhu University Shenyang, China zxnbzjAbstractA pre aeration-SBR process was adopted in the treatment of sewage wastewater in Qingdao City. The amount of

3、 wastewater was 500t/d, with COD of 500.0mg/L, BOD5 of 235.8 mg/L, SS of 165.8 mg/L and NH4+-N of 60.5 mg/L on average. The average removal rates of these indexes are 92.3%, 95.6%, 92.8% and 86.0% respectively. The effluent concentrations of these indexes are 38.3 mg/L, 10.3 mg/L, 12.0 mg/L and 8.5

4、mg/L, which met the grade first B requirements of Discharge standard of pollutants for municipal wastewater treatment plant (GB18918 2002). The cost was 0.57 Yuan per ton of wastewater. This process had the advantages of low land area, low cost, high effect and simple operation and so on.products fa

5、ctories, domestic sewage of the factories, domestic sewage of the resident and a little wastewater from machining work. The total quantity was small but discharged intermittently. The project was designed economically and effectively according to the actual situation of this town. The effluent water

6、 quality met the grade first B requirement ofDischarge standard of pollutants for municipal wastewater treatment plant (GB189182002) 2. The water quality of influent is described in TABLE I.TABLE I.WATER QUALITY OF THE INFLUENT AND DISCHARGESTANDARDKeywords- Sewage wastewater; Balance with pre-aerat

7、ion; SBR INTRODUCTION There are a lot of problems in the development of Chinese towns, especially the pollution of ecological environment. The characters of Chinese town sewage are large amount, low treating effect and with no completed treating and collecting system. The constructions of wastewater

8、 treatment systems in Chinese town have the disadvantages of large investment in infrastructure, high operation cost, long treating time and large land area 1. There are many wastewater treating plants not running because of lack of operation fund. So the selection of wastewater treatment process fo

9、r town should consider these facts as well as its impacts on the environment and its energy consumption. The pre aeration-SBR wastewater treatment process adopted in a town in Qingdao performed well, which reached a balance in the economy, environment and effect. In this paper, the design parameters

10、, treatment effect and the investment on instruction and operation of this project were introduced. WATER QUALITY 500t of wastewater in this town was produced in this town. The wastewater was composed with wastewater from foodSponsor acknowledgement: Scientific and technological projects of ministry

11、 of housing and urban-rural construction (2009-k7-9).ItemCODBOD5SSNH4+-NpH(mg L-1)(mg L-1)(mg L-1)(mg L-1)Actual400-600200-300150-20050-706.9influentDesigned600300200709.0influentDischarge602020156.9standard THE TREATMENT PROCESS AND EQUIPMENT OF WASTEWATERA. ProcessThe selection of the wastewater t

12、reatment process mainly relies on the quality of sewage and the raw water is mainly composed by the wastewater of food production, domestic sewage of site area, and a little machinery processing wastewater. Since the wastewater of the town had the quality of small volume, high volatility of the wate

13、r quality, high concentration of organic compounds, high ammonia nitrogen content, good biochemical characteristics of the wastewater, so for the wastewater treatment of the town , the emphasis is on the treatment of ammonia nitrogen and organic compounds, and based on the above reasons, combined wi

14、th the treatmenttechnology of urban sewage , on the basis of the simulated experiment, through the optimization of the best drug and process, adopt flexible operation of sequencing batch reactor, which represents the pre aeration-SBR sewage treatment process 3. The flowchart of wastewater treatment

15、is in Fig. 1.SBR from pre-aeration tank and the BOD and NH4+-N was removed largely by the suspended active sludge in an aerobic environment, with proper operation method. And then the treated water and sludge were separated in the SBR. In this process, the micro organism in the sludge proliferated by digesting the organic substance and discharged as surplus sludge. The surplus sludge was thickened by gravity and treated with physic; and then dehydrated by filter press. The filter cake was carried away and bu