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Water purification technology

A water purification and process technology, applied in the field of water treatment, can solve the problems of low removal capacity and toxicity of dissolved organic matter, achieve good removal effect, reduce membrane pollution, and reduce pollution.

Inactive Publication Date: 2008-07-23
TORAY FIBER RES INST(CHINA) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, more than 99% of my country's waterworks still use the conventional treatment process of coagulation-sedimentation-filtration. This traditional process aims to remove turbidity, suspended solids, colloids, chroma, etc. in water. Very low organic removal capacity
Moreover, during the chlorination disinfection process, chlorine reacts with organic matter in water to produce trihalomethanes (THMs) and other halogenated by-products, such as haloacetic acid, haloacetonitrile, trichloroacetone, chlorophenol, etc. Among these halogenated organic compounds are Many are carcinogens or mutagens and are toxic at higher concentrations

Method used

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  • Water purification technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First build an ozone generating device, an ozone contact tower, a powdered activated carbon dosing device, a mechanical coagulation tank, an inclined tube sedimentation tank, and a PVDF hollow fiber microfiltration device.

[0031] COD of polluted source water Mn (Water pollution indicator COD Mn It refers to the consumption of oxidant (K 2 MnO 4 ), which is often used as a comprehensive indicator reflecting the degree of water pollution by reducing substances, is a routine monitoring indicator of water pollution and an important pollution control indicator) is around 6mg / L, turbidity is 20-80NTU, and iron in water High manganese content. After the source water is pre-oxidized by ozone (the concentration of ozone is 0.5-1.5mg / L) for 5 minutes, it enters the coagulation and sedimentation unit, and aluminum sulfate is used as the coagulant. The dosage of the coagulant is about 15-20mg / L ; After passing through the coagulation and sedimentation unit, the effluent water...

Embodiment 2

[0035] In addition to adding 20mg / L powdered activated carbon at the front of the coagulation tank, the ozone pre-oxidation time is 10 minutes (the concentration of ozone is 1.5-2.0mg / L), and polyaluminum chloride is used as the coagulant. The amount is about 5-10 mg / L, and the PVDF flat membrane with a pore size of 0.05 μm is used, and other conditions are basically the same as in Example 1. The test results showed that the final COD Mn The removal rate can be about 60%. Compared with Example 1, the removal rate of organic matter can be effectively improved, so it can be used as an emergency rescue process in the period of water quality deterioration. The final effluent can fully meet the national drinking water quality standards.

Embodiment 3

[0037] Except adding the powdered activated carbon of 10mg / L simultaneously at the front end of the coagulation tank, other conditions are basically the same as example 1. The test results are shown in Table 2. It can be seen that when the water quality of source water deteriorates, COD Mn When it is above 7mg / L, after adding 10mg / L powdered activated carbon, the final effluent COD Mn The removal rate can be more than 60%, which can fully meet the national drinking water standard. Compared with Example 1, the addition of powdered activated carbon can effectively improve the removal rate of organic matter, reduce the pollution load of the microfiltration membrane, and prolong the chemical cleaning cycle of the membrane. Therefore, it can be used as an emergency process when the water quality of the water source is deteriorating.

[0038]Table 2 Water purification effect of microfiltration membrane group and process after adding powdered activated carbon (water temperature 20°...

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Abstract

The invention relates to a water-purifying technology, which pre-oxidizes water by adopting ozone, then the pre-oxidized water is treated with coagulating sedimentation, finally the precipitated water is filtered by a microporous filter membranes and the effluent water is disinfected. The invention can improve the removing rate of iron and manganese, the oxidation-resistant hollow fiber microfiltration membrane technology which is adopted by the invention has strong adaptability and high safety; furthermore, the equipment is compact and has excellent performance in eliminating microorganisms and bacteria, which effectively guarantees the quality of the effluent water.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a water purification treatment process, especially drinking water. Background technique [0002] With the development of industry and agriculture, my country's drinking water sources have been seriously polluted. Monitoring shows that about 63% of urban river sections are moderately or severely polluted, and 97% of urban groundwater is polluted to varying degrees. At present, more than 99% of my country's waterworks still use the conventional treatment process of coagulation-sedimentation-filtration. This traditional process aims to remove turbidity, suspended solids, colloids, chroma, etc. in water. Organic matter removal capacity is very low. Moreover, during the chlorination disinfection process, chlorine reacts with organic matter in water to produce trihalomethanes (THMs) and other halogenated by-products, such as haloacetic acid, haloacetonitrile, trichloroacetone, chlorophen...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/78C02F1/52
Inventor 常春杨瑜芳董秉直高乃云池田啓一
Owner TORAY FIBER RES INST(CHINA) CO LTD
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