Adsorption condensation method for removing natural organic matter in water by enhancing micro-interface adsorption

A coagulation process and flocculation technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sewage treatment, etc., can solve problems such as difficult control, increased corrosion of pipe network, and lower pH value, etc. Convenience, low engineering investment cost and simple method

Active Publication Date: 2012-02-08
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The amount of coagulant is mainly based on the electric neutralization of the surface of colloidal particles, so the traditional coagulation process is not effective in removing soluble natural organic substances such as humic acid and fulvic acid.
The methods to improve the removal effect of natural organic matter on the basis of the traditional coagulation process mainly include: 1) increasing the dosage of coagulant, increasing coagulation hydrolysis products (such as aluminum hydroxide Al(OH) 3 ) content, and give full play to its adsorption and removal effect on natural organic matter in water; 2) adjust the pH value, generally reduce the pH value to about 6 to improve the interaction between flocculant and natural organic matter, but this method is complicated to operate and difficult to control; 3 ) to optimize the type of flocculant, such as using Al 13 Higher content of flocculant; 4) Utilize CaCO generated during softening process 3 , Mg(OH) 2 etc. for the adsorption of natural organic matter, but this method is only suitable for the treatment of high hardness water
[0004] Among the above methods, increasing the dosage of coagulant is the most commonly used in engineering, but there are still the following problems in the application: 1) the alkalinity in the water is consumed, the pH value is reduced, and the corrosiveness of the effluent to the pipe network is enhanced; 2) the concentration of aluminum in the factory water There is a risk of exceeding the standard; 3) The cost of medicine may be significantly increased, etc.
Since this method mainly relies on the function of the flocculant itself, the morphological change of the flocculant and its influence on the removal of natural organic matter during the coagulation reaction are ignored, and the nature of the natural organic matter itself and its interaction with different forms of the flocculant are not considered. Relying solely on the effect of flocculant hydrolyzate (such as aluminum hydroxide) on the removal ability of natural organic matter is obviously limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The oxygen consumption of raw water in a water plant was 5.0 mg / L, which was confirmed to be natural organic pollution after investigation of pollution sources. The water plant uses polyaluminum chloride coagulant, and the effect of coagulation removal of oxygen consumption is not ideal when the dosage reaches 20mg / L. 2006)" requirements (when the raw water oxygen consumption is <6mg / L, the factory water oxygen consumption is <3mg / L).

[0022] Adopt adsorption coagulation method of the present invention to strengthen removal of organic matter in water: 1) determine that the flocculant in the mixed solution that potassium permanganate and flocculant are formed adopts ferric chloride; 2) potassium permanganate and ferric chloride are fully mixed Dissolve under stirring to obtain a mixed solution of potassium permanganate and ferric chloride, wherein the mol ratio of potassium permanganate and ferric chloride is 1: 1. 3) The dosage of polyaluminum chloride is still 20mg / ...

Embodiment 2

[0024] The raw water oxygen consumption of a water plant was 5.6 mg / L, which was confirmed to be natural organic pollution after investigation of pollution sources. The water plant uses aluminum sulfate coagulant, and the dosage reaches 40mg / L. The effect of coagulation to remove oxygen consumption is still unsatisfactory. The oxygen consumption of factory water is 3.8mg / L, which exceeds the national "Drinking Water Sanitation Standard (GB5749-2006) "Requirements (when the oxygen consumption of raw water is less than 6mg / L, the oxygen consumption of factory water is less than 3mg / L).

[0025]Adopting the adsorption coagulation method of the present invention to strengthen the removal of organic matter in water: 1) determine that the flocculant in the mixed solution composed of potassium permanganate and flocculant adopts ferric sulfate; 2) dissolve potassium permanganate and ferric sulfate under sufficient stirring, Obtain the mixed solution that potassium permanganate and fer...

Embodiment 3

[0027] The oxygen consumption of raw water in a water plant was 6.5 mg / L, which was confirmed to be natural organic pollution after investigation of pollution sources. The water plant uses ferric chloride coagulant, and the dosage reaches 25mg / L. The effect of coagulation to remove oxygen consumption is still unsatisfactory. The oxygen consumption of factory water is 5.2mg / L, which exceeds the national "Drinking Water Sanitation Standard (GB5749- 2006) "requirements (when the oxygen consumption of raw water > 6mg / L, the oxygen consumption of factory water < 5mg / L).

[0028] Adopt the adsorption and coagulation method of the present invention to strengthen the removal of organic matter in water: 1) determine that the flocculant in the mixed solution composed of potassium permanganate and flocculant adopts aluminum sulfate; 2) dissolve potassium permanganate and aluminum sulfate under sufficient stirring, Obtain a mixed solution composed of potassium permanganate and aluminum su...

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Abstract

The invention belongs to the technical field of drinking water treatment, and especially relates to an adsorption condensation method for removing natural organic matter in water by enhancing micro-interface adsorption. Based on coagulation technology, with the purposes of enhanced removal of natural organic matter and control of disinfection by-products, the invention provides a method for effectively removing natural organic matter in water by enhancing a micro-interface adsorption process and thus by the combined action of adsorption / condensation. The invention can effectively improve the removing effect of drinking water routine treatment processes on natural organic matter, and decrease the turbidity and oxygen consumption of settled water and filtered water. In addition, the invention can also improve the coagulation sedimentation effect on low turbidity water, low temperature water, low temperature low turbidity water, high organic pollution water, and decrease the turbidity and particle concentration of settled water. The invention is mainly applicable to purification in drinking water plants, and is also applicable to advanced treatment of secondary effluent in sewage plants with the purpose of reclaimed water reuse.

Description

technical field [0001] The invention belongs to the technical field of drinking water treatment, and in particular relates to a method for improving the removal effect of coagulation on natural organic matter by strengthening micro-interface adsorption in the coagulation treatment process of drinking water. Background technique [0002] Coagulation is the core unit of drinking water treatment. The quality of coagulation effect directly determines the operation effect of subsequent sedimentation and filtration units. The initial control target of the coagulation process is turbidity, colloidal particles, etc. With the increase of organic pollution in water sources and the need to control disinfection by-products, coagulation is endowed with more functions, removing natural organic matter and disinfection by-product precursors to become coagulation Intensified coagulation is also considered by the US Environmental Protection Agency to be one of the most effective technologies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/52C02F1/58
Inventor 曲久辉刘锐平刘会娟兰华春田川李杰
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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