Oxygen-rich biological pre-treating depollution process for slightly polluted raw water

A biological pretreatment and micro-pollution technology, applied in the field of water treatment, can solve the problems of difficulty in effectively reducing organic pollution in water, unable to meet the needs of purifying water quality, and low removal rate of dissolved organic matter, and achieves prolonging biological residence time, occupying more space. The effect of small land area, flow and fast update speed

Inactive Publication Date: 2007-11-07
NANKAI UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The coagulation and clarification process mainly removes suspended solids and colloidal substances in water. This process has a high removal rate for insoluble matter and colloidal organic matter in water, but the removal rate for dissolved organic matter is very low, and it is difficult to effectively reduce organic pollution in water.
Traditional physical and chemical methods can no longer meet the needs of water purification
Some new and efficient physical and chemical methods that have emerged have good treatment effects and can remove some organic matter, but many technologies are not mature enough to be used on a large scale, and there are still disadvantages such as large equipment costs and high operating costs, and most of them Chemical methods will produce certain side effects, such as potassium permanganate oxidation method will bring problems such as chroma; breakpoint chlorine method will greatly increase the content of carcinogens trihalomethanes in water, resulting in poor taste of tap water and safety. Decrease, effluent pH value drop, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw water of a slightly polluted water source in a certain river section, its water quality is shown in Table 1, using the conventional pre-chlorination-coagulation sedimentation-filtration-chlorine disinfection water purification system of the water plant, the factory water cannot meet the drinking water standards and requirements. After the combination of oxygen-enriched biological pretreatment and conventional water purification process, the factory water is better than the drinking water standard. In the biological aeration tank, under normal operating conditions, the water temperature is 20°C to 26°C, the HRT is 1.2h and the DO is 10mg / L to remove organic matter, ammonia nitrogen, Fe 2+ , Mn 2+ The effects are shown in Table 1.

[0021] water quality index

[0022] It can be seen from Table 1 that after the oxygen-enriched biological pretreatment, the effluent is treated by the conventional influent process, and the outgoing water can meet the drinki...

Embodiment 2

[0024] A micro-sewage source water was treated by a combination of oxygen-enriched biological pretreatment and conventional water purification process, and the factory water was better than the drinking water standard. The processing results are shown in Table 2. See Table 2 for the decontamination effect of the biological aeration tank under normal operating conditions with water temperature of 17°C-26°C, HRT of 1.2h and DO of 11mg / L.

[0025] water quality index

[0026] It can be seen from Table 2 that after the oxygen-enriched biological pretreatment, the effluent is treated by the conventional influent process, and the outgoing water can meet the drinking water requirements.

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Abstract

The present invention provides oxygen-rich biological pre-treating process for slightly polluted raw water featuring the biological action of high aerobic oligotrophic microbe. Based on the bioreaction characteristic of oligotrophic microbe in oxygen-rich aeration condition with DO of 10-15 mg/l, oligotrophic microbe, such as soil bacillus, hydrophilic aeromonad, flavobactreium, etc is used to eliminate pollutant in high aerobic condition through biological oxidation. Compared with other treating technology, the present invention has the advantages of high treating efficiency and low running cost. The present invention may be used to replace chemical pre-treatment process with Cl2, KMnO4, O3, etc.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to an oxygen-enriched biological pretreatment process for slightly polluted raw water. The method and process are especially suitable for pretreatment and decontamination of slightly polluted water source raw water, and are suitable for combining with traditional conventional water purification processes to form an optimized combination process for purifying slightly polluted raw water. Background technique [0002] Judging from the current situation in our country, the pollution of water sources is becoming more and more serious, and the range of polluted water sources is expanding day by day. In recent years, although my country has done a lot of work in the prevention and control of water pollution, the water quality of many rivers and lakes is still gradually deteriorating and showing a development trend. The pollution of waters in industrially developed areas is particu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02
CPCY02W10/10
Inventor 肖羽堂
Owner NANKAI UNIV
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