Method for removing organic pollutants from water by drinking water enhanced treatment

A technology for the enhanced treatment of organic pollutants, applied in chemical instruments and methods, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of slow reaction speed, decreased performance of surface modified substances, and oxidation ability of simple oxidants Insufficient and other problems, to maintain the adsorption capacity, to make up for the loss of metal oxides

Inactive Publication Date: 2010-04-21
TONGJI UNIV
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Problems solved by technology

[0006] The invention overcomes the problems of insufficient oxidizing ability and slow reaction speed of simple oxidants, and at the same time adds new functions to the filtration process of the filter bed, and overcomes the problems that the modified filter material is difficult to completely regenerate through backwashing due to adsorption saturation, and the performance drops after the surface modified substances fall off. problems, and provides a method for removing organic pollutants that integrates physical adsorption, chemical coordination complexation, and catalytic oxidation.

Method used

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  • Method for removing organic pollutants from water by drinking water enhanced treatment

Examples

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Embodiment 1

[0024] Example 1. The source water of a surface water body has a turbidity of 2.6 NTU and a TOC of 6.2 mg / L after coagulation and sedimentation. Add a mixed solution of sodium hypochlorite and ferric chloride to the water, so that the concentration of sodium hypochlorite in the water is 4.5mg / L, and the concentration of ferric chloride is 0.3mg / L. The reaction time before filtration is 30s, and the residence time of the filter layer hollow bed is 10min. Aluminum, manganese oxide composite modified quartz sand filter material for filtration. The average turbidity of the filtered water is 0.5NTU, and the TOC is 2.5mg / L. The results of online color mass detection showed that the types of trace organic pollutants were reduced by 33%, and the total amount was removed by 65%. The same water quality is filtered through quartz sand, the average turbidity of the filtered water is 1.7NTU, the TOC is 4.9mg / L, the types of trace organic pollutants are not reduced, and the total amount is...

Embodiment 2

[0025]Example 2. A groundwater source has low content of natural organic matter but is polluted by phenol, and the content of phenol in the water is about 0.3 mg / L. Potassium permanganate is added at a concentration of 3 mg / L during the treatment process. After the addition, it enters the filter layer for filtration. The residence time of the hollow bed in the filter layer is 6 minutes. Iron oxide modified ceramsite is used as the filter material of the filter bed, and the effluent phenol The content can be kept below 0.1mg / L. Through the catalysis of the modified filter material, the phenol oxidation rate and oxidation speed are obviously improved. From figure 1 It can be seen that when the residence time of the hollow bed in the filter layer is 6 minutes, the removal rate of phenol is 70%, while the direct reaction between potassium permanganate and phenol, the removal rate of phenol is only less than 3%, and the removal efficiency is increased by more than 20 times.

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Abstract

The invention relates to a method for removing organic pollutants from water by drinking water enhanced treatment, which comprises the following steps: adding an oxidizing chemical medicament in water to be treated for reaction for 0.5 to 10 minutes and filtering the water by using a modified granular filter medium filter bed, wherein 0.2 to 5 milligrams of chemical medicine is added into each litter of water to be treated; and filtering a granular filter medium by using quartz sand, zeolite, cordierite, ceramic grains and other filter beds undergoing surface modification by oxides of metals such as iron, manganese and aluminum, wherein before filtration, the oxidizing mixed medicine at a certain concentration is added into water to be filtered, natural organic substances and micro organic pollutants in water can be removed effectively when the water staying in the filter bed for a certain period flows out of the filter bed, and at the same time, the added medicament does not penetrate a filtering layer. The method can remove natural organics in water, in particular persistent micro organic pollutants that generally cannot be removed quickly by the oxidation by potassium permanganate, ozone and hydrogen peroxide, at high speed with high removal rate and small residual amount, and thus is an economic and high-efficient organic pollutant removing method.

Description

technical field [0001] The invention relates to a method for strengthening drinking water treatment to remove organic pollutants in water. Background technique [0002] With the rapid development of industry and agriculture, the types and contents of organic matter in source water have gradually increased, mainly including natural organic matter, synthetic organic matter and endocrine disruptors. Natural organic matter exists widely in various natural water bodies. It can complex with metal ions in water, affect the water treatment effect, easily cause bacteria to re-grow in water distribution pipelines, and is the precursor of various mutagenic disinfection by-products. In addition, there are a wide variety of artificially synthesized organic substances in water, which enter natural water bodies through wastewater discharge, precipitation, leakage, water transportation and transportation accidents, and pose a great threat to drinking water quality and human health. Many of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72
Inventor 隋铭皓盛力
Owner TONGJI UNIV
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