Special for [Domestic purification tank treatment equipment in service area]

Special for [Domestic purification tank treatment equipment in service area]

Domestic sewage is the sewage generated in the process of human daily life, mainly including kitchen washing, kitchen waste water, toilet flushing, hand washing waste water, bathroom bathing water, laundry waste water, floor washing waste water and other water discharged from living facilities.
Sewage generated in the process of human life is one of the main sources of water pollution. Domestic sewage contains a lot of organic substances, such as cellulose, starch, sugar, fat protein, etc; It also often contains pathogenic bacteria, * * * and parasite eggs;
Chloride, * * * salt, phosphate, bicarbonate, sodium, potassium, calcium, magnesium, etc. of inorganic salts. The general feature is that it contains high nitrogen, sulfur and phosphorus, and under the action of anaerobic bacteria, it is easy to produce malodorous substances.
General quality of domestic sewage
The quality of domestic sewage is generally CODcr 350~500mg/L, BOD5 150~250mg/L，SS 200~300mg/L，TN 20~85mg/L，TP 4~15mg/L。

In addition, during holidays, the service area is generally overloaded, and the sewage quality can be maintained at the upper limit of each section in the table above for a long time, which belongs to very high concentration domestic sewage. Therefore, in the design phase of the sewage treatment project in the service area, it needs to be suitable for "quality". Most of the current sewage design specifications are applicable to general urban domestic sewage, and some of the design parameters may not be applicable to the design of high concentration service area sewage treatment. For example, due to the high concentration of pollutants such as COD, the residence time of sewage in the service area in the biochemical section must be significantly longer than that of traditional municipal sewage. According to the water quality survey in the service area, The improper selection of inlet water quality design parameters leads to excessive sewage treatment load, which is an important reason for the unqualified effluent after the completion of sewage treatment stations in many expressway service areas. （2） The fluctuation of sewage volume has a great impact Stochastic changes in traffic flow due to weather, holidays, time periods or other factors, resulting in sewage in the service area Measuring tools There is a large fluctuation, and the traffic flow is the key factor leading to the change of sewage volume in the service area key factor. 1) General The amount of sewage is large in summer and small in winter 。 2) The sewage volume will also fluctuate greatly in 1d The peak occurs at noon, and the trough occurs late at night or early in the morning 。 3) At the beginning of the expressway operation, the traffic flow was small, and then increased year by year, and the sewage volume also increased year by year. 4） On holidays, especially during legal long holidays, the traffic volume of reception vehicles in many service areas is generally 2 times or more than the daily average. At this time, the sewage generated in the service area will generally increase by corresponding multiples. Among the above four factors causing water volume fluctuation The impact of holidays on the sewage treatment station in the service area is obvious and prominent 。 According to the survey, the daily sewage volume of a high-speed service area in western China during the Spring Festival is five times of the usual sewage volume. Different from the fluctuation of sewage volume in one day, the sewage volume during the holiday will remain at a high level for several days, greatly exceeding the rich treatment scale of general sewage treatment stations. Generally, the biochemical treatment section of the sewage treatment station can be impacted for a short time, but it is difficult for the biochemical system to achieve stable and qualified effluent quality for the incoming water with high concentration and large volume for a long time. Therefore, due to The impact load caused by the violent fluctuation of water volume is also an important factor affecting the normal and stable operation of the sewage treatment facilities in the existing high-speed service areas in China.

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