| Wasterwater quality of Municipal wastewater is related to the sewage treatment plant size, operating stability, other operating costs,treatment compliance rate and the hydraulic conditions of, affecting water quality main factors include the degree of perfection of the city sewer, city's nature, size, population, living habits, improving sanitation levels and per capita living space and so on..There are Beishiqiao sewage water purification center, Dengjiacun sewage treatment plant and the third sewage treatment plant which have run a longer time.By the way of analying the data it is showed that water quality of xi'an sewage treatment plant in recent years changed deterioration year by year, and wastewater quantity increased year by year. Then I drawed water quality and water quantity of three wastewater treatment plants changeable curves with the months.Through comparing and analyzing,I found that fluctuations in water quality and water quantity is related to the lives of people's habits, weather conditions, the peak holiday seasons.As the proportion of life pollution source in the sewage treatment plant influent water increases year by year, I surveyed the sources of life by industry classification, site monitoring, and mathematical statistics,through an analysis and evaluation,I drew the following conclusions:First of all, with the transformation of villages in the city the urban population density increased year by year; and because of people's living standards improving, per capita using water increases year after year, these are the main reasons of water quality changing deterioration and wastewater quantity increaseing year by year.Second, Wastewater treatment plant influent water quantity changed as follows:January was high,February was declining,between 3-6 showed growth,6-8 were present among a small wave of,9-10 was declining,10-12 was increasing again;water quality changed as follows:a higher concentration in January, February decline in March-5,6-8month rise again in August by the maximum value,9-10month decline again,in December was increasing a small peak.Third, another important factor of affecting water quality and quantity of sewage water is the penetration rate of urban drainage network and its installation method. With the city sewer drainage network spreading and transformation of old urban areas,wasterwater having no access to municipal sewage pipeline network is also incorporated into the wastewater treatment plant, so the amount of water sewage plant is increasing year by year, water quality is getting worse year by year.Fourth, Lifestyle concentration of pollutants varied from industry to industry sources. COD concentration of various industries ordered in decreasing, catering> school> Accommodation Industry> Residential Area> Bath Industry> Hospital, COD average concentration values were 1717 mg/L,666 mg/L,545 mg/L,489 mg/L,316 mg/L,159 mg/L,.Residential, accommodation and schools have no septic tanks;ammonia concentration ordered in decreasing, the school> Residential Area> Catering Services> Accommodation Industry> Hospital, concentrations were 58.92 mg/L,55.00 mg/L,25.55 mg/L,25.10 mg/L,22.96 mg/L, restaurant industry's animal and plant oil pollution were most serious, the average concentration value is 36.26 mg/L,which have relationship with having grease traps or not and grease traps'handling efficiency.Fifth, restaurants, schools, accommodation industry and the living quarters are the "high pollution" of daily living pollution sources in the industry, relevant departments should strengthen supervision and maintain septic tanks and grease traps build and ensure its proper operation.This will has practical significance for reducing the pollutant source and energy conservation.
|
PDF Full Text Request