Process and method for treating city waste warter

A technology for urban sewage and urban domestic sewage, applied in the field of environmental protection and water pollution control, can solve the problems of sludge not being properly treated and disposed, difficult to effectively remove heavy metals and chromaticity, capital construction investment and operating costs increase, etc. Achieve the effect of saving power consumption, large height-diameter ratio and small land area

Inactive Publication Date: 2004-12-15
NANKAI UNIV
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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, in

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  • Process and method for treating city waste warter
  • Process and method for treating city waste warter

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Embodiment Construction

[0042] figure 2 It is the technological process of the present invention

[0043] After the urban domestic sewage 1 is pretreated by the grid 2 and the grit chamber 3, it goes through the following processes in sequence:

[0044] The urban sewage is treated by the high-efficiency anaerobic treatment unit 17 reactor, and the effluent is discharged after the secondary sedimentation tank 6 removes a small amount of anaerobic microorganisms. Sludge dehydration treatment 11, final disposal 12, biogas generated by high-efficiency anaerobic treatment unit 13, recycling 14.

[0045] The anaerobic treatment unit 13 uses an expanded granular sludge bed reactor.

[0046] What the anaerobic treatment unit 13 adopts is the normal temperature anaerobic reactor.

[0047] Most of the organic matter in the urban sewage is degraded by the anaerobic treatment unit 13 .

[0048] Heavy metals in sewage are stabilized in the anaerobic treatment unit 13 .

[0049] Chromaticity and refractory org...

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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...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F9/14C02F11/02C02F11/12
Inventor 李克勋张振家
Owner NANKAI UNIV
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