Process and method for treating city waste warter

Abstract

The present invention provides life sewage treating process and method suitable for middle and small city, belongs to the field of environment protecting technology and aims at lowering sewage treating cost and power consumption and eliminating chroma, heavy metal and hard-to-degrade organic matter. The technological scheme includes pre-treatment of sewage with grille and silt basin, anaerobic treatment in efficient anaerobic reactor to degrade organic matter in sewage into marsh gas and stabilize heavy metal ion, eliminating anaerobic sludge in the secondary deposition tank and draining, and concentrating and dewatering sludge and landfilling. The present invention has the features of high efficiency, low power consumption, small covered area, and low cost.

Description

technical field [0001] The invention relates to a process and method for domestic sewage treatment, and belongs to the field of environmental protection and water pollution control. Background technique [0002] Water pollution is one of the serious environmental problems facing our country. The urban sewage treatment rate in my country was only 3.3% in 1991, especially in some small and medium-sized cities, due to the lack of funds, urban sewage treatment is even more difficult. The direct discharge of a large amount of sewage has caused 82% of the 532 rivers in the country to be polluted to varying degrees. The direct discharge of a large amount of sewage not only destroys ecology and aggravates water shortages, but also seriously endangers industrial and agricultural production and human health and safety. [0003] At present, domestic and foreign urban sewage treatment mainly adopts the activated sludge method. Its treatment process is as follows: [0004] Sewage fro...

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Problems solved by technology

[0009] 2. High power consumption and large floor space

The power consumption of blast aeration accounts for about 1 / 3~1 / 2 of the power consumption in traditional sewage treatment plants, which has caused another phenomenon in my country's urban sewage treatment plants: even if the sewage treatment plants are built, However, due to high operating costs, it is not functioning normally

In addition, the refractory organic matter contained in sewage is very difficult to remove

In order to remove this part of the substance, the aeration time must be extended, resulting in an increase in the area of ​​the treatment facility, infrastructure investment and operating costs

Although there is no problem of land resources in our country at present, with the growth of economy, the cost of land will further become another factor restricting urban sewage treatment

[0011] 3. It is difficult to effectively remove heavy metals, chroma and some refractory organic substances

[0015] 4. The amount of sludge produced is large, the content of organic matter is high, and the sludge treatment is difficult and costly

Although the sewage in some places has been effectively treated, the sludge has not been properly treated and disposed of, causing secondary pollution

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