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Treatment method of domestic wastewater

A technology of domestic sewage and treatment method, applied in the direction of adsorption water/sewage treatment, etc., can solve the problem of high cost of advanced treatment technology, and achieve the effect of wide source, comprehensive utilization and wide pH range

Inactive Publication Date: 2013-04-24
DATANG INT HIGH ALUMINA COAL R & D CENT +1
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Problems solved by technology

[0007] The purpose of the present invention is to provide a treatment method for domestic sewage, especially for the effluent after biochemical treatment, by using calcium silicate as the adsorption material, it not only has a relatively high removal rate for COD, but also overcomes the depth in the prior art. Disadvantages of high cost of processing technology, realize the comprehensive utilization of resources, and be conducive to environmental protection

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Embodiment 1

[0025] The method for advanced treatment of domestic sewage by using calcium silicate adsorbent is processed according to the following steps:

[0026] (1) Grinding calcium silicate until passing through an 80 mesh sieve, collecting calcium silicate powder;

[0027] (2) Dry the calcium silicate powder at 120°C for 2 hours, and the drying temperature and time are controlled under the condition that the moisture content of the calcium silicate is less than 5%;

[0028] (3) Add the dried calcium silicate powder into the effluent of biochemically treated domestic sewage at a dosage of 0.1-1.0g / 100mL, and adjust the pH value of the sewage to 2-12 (can be used according to the nature of the water) h 2 SO 4 or NaOH adjustment), the calcium silicate is fully mixed and reacted at ambient temperature to realize the adsorption of pollutants in sewage.

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Abstract

The invention relates to a treatment method of domestic wastewater, and belongs to the field of environmental protection. The method comprises the following steps of: adding calcium silicate into the domestic wastewater from a biochemical treatment process, controlling the dosage of calcium silicate to be 0.1-1.0g in per 100mL of the domestic wastewater and adjusting the pH to 2-12, uniformly dispersing calcium silicate in the water, keeping for 15-90 minutes, and then filtering and collecting the treated water. Calcium silicate adopted by the method is from a by-product of a technique related to extracting alumina from high-aluminum pulverized coal ash; and calcium silicate has the characteristics of large specific surface area, micro pores formed inside and low cost, so the removal rate of COD (Chemical Oxygen Demand) is high, a high cost defect of the advanced treatment in the prior art is overcome, comprehensive utilization of the resource is realized, and environmental protection is benefited.

Description

technical field [0001] The invention relates to a domestic sewage treatment method, which belongs to the field of environmental protection. Background technique [0002] Domestic sewage is the sewage produced in the process of human life, and it is one of the main pollution sources of water bodies. Mainly feces and washing sewage. Domestic sewage contains a large amount of organic matter, such as cellulose, starch, sugar and fatty protein; it also often contains pathogenic bacteria, viruses and parasite eggs; inorganic salts such as chloride, sulfate, phosphate, bicarbonate and sodium, Potassium, calcium, magnesium, etc. The general characteristic is high nitrogen, sulfur and phosphorus content. Compared with industrial wastewater, the water quality of domestic sewage is generally more stable and the concentration is lower. [0003] With the acceleration of urbanization and the improvement of living standards, the discharge of urban domestic sewage is also increasing yea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28
Inventor 韩剑宏孙俊民刘派张战军马莉杨冬梅张婷婷黄永海
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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