Generation Coefficient And Discharge Coefficient Of Domestic Pollution Sources In Chongqing

From the fourth quarter of 2006 to the year of 2009, the first national pollution sources sensus has been launching by the State Council. The basic content includes industrial source, domestic source and agricultural source. On that basis, The pollution generation coefficient and discharge coefficient of domestic source have been studied in Chongqing. Because the method of pollution generation and discharge coefficient is a fundament to calculate the amount of pollution, so calculation of pollution generation and discharge coefficient is of great importance.The study comprised residential areas, lodging, catering, bath, beauty salons, laundry, car-washing and hospital. The monitoring perid is divided into four phases. It is frorm September 2007 to March 2008 to monitor wastewater discharge and pollution concentration. And at the same time, it is maked the pollution generation and discharge coefficient by the method of mathematical statistic. The main conclusions are as follows:①It has determined the pollution generation coefficient and discharge coefficient of residential areas, lodging industry, catering industry, bath industry, beauty salons industry, laundry industry, car-washing industry and hospital by the study of domestic pollution source.②Different pollutants have obvious characteristics of industries. Based on the analysis of pollutants concentration coefficient, it has drew the conclusion that the order of COD concentration is: catering industry> residential areas>lodging industry >laundry industry >beauty salons industry >bath industry industry >government units >car-washing industry> Hospital. The order of total nitrogen concentration is: residential areas> hospital>catering industry >lodging industry >government units >bath industry > beauty salons industry > laundry industry. The order of total phosphorus concentration is: catering industry> residential areas> lodging industry> government units >Hospital> laundry industry> beauty salons industry> bath industry industry> car-washing.③The primary pollutant of domestic pollution sources in Chongqing is COD. By analysis on load ration of equivalent of different sources, it is concluded that the primary pollutant of residential areas, tertiary industry (exclude catering industry) and hospital is COD and the primary pollutants of catering industry are animal and vegetable oils and COD.④The monitoring indexes of the tertiary industry of this study are more comprehensive than ever. The new indexs include ammonia nitrogen, total nitrogen, total phosphorus,lead and mercury.⑤The concentration coefficient is as the first coefficient when accounting the total discharge amount of pollutants. The percapital coefficient and the hardware coefficient are the two times transfer of the concentration coefficient. They are influenced by percapital wasterwater discharge and unit hardware wastewater discharge. The deviation of the percapital coefficient and the hardware coefficient may lead to relatively large errors.⑥The wastewater discharge and pollutant discharge of lodging industry have the obvious characteristic of periods. The water peak period is 9:00 to 12:00 am and after 7:00 pm. The change law of COD is similar with wastewater. The concentration peak of COD is 246mg/L. The concentration peak of animal and vegetable oils is 2.22mg/L. The highest concentration of ammonia nitrogen, total nitrogen is in the morning and evening.⑦The wastewater discharge and pollutant discharge of catering industry have the obvious characteristic of periods. The water peak period is 9:00 am to 1:00 pm and 6:00 pm to 8:00 pm. The change laws of COD and animal and vegetable oils are similar with wastewater. The concentration peak is respectively 3420mg/L, 93mg/L. The concentration peak of total phosphorus is at the wash stage. It changes smoothly at the rest of the time.⑧The determination of pollution generation coefficient and discharge coefficient provides a simple method to count the total discharge amount of pollutants. As long as knowing the annual water consumption, it could count the total discharge amount by simple calculation. It also could use percapital coefficient and hardware coefficient to calculate the total discharge amount when it doesn't know the annual water consumption of pollution source.