Control method for disinfection by-product based on matching of precursor form and flocculating agent form

A technology of disinfection by-products and control methods, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve problems such as the interaction relationship and reaction process of the precursors of disinfection by-products without consideration, so as to reduce the oxygen consumption of factory water and improve efficiency effect

Inactive Publication Date: 2011-03-09
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the traditional enhanced coagulation control method for disinfection by-product precursors mainly stays in the influence of flocculant type and dosage, degree of alkalinization and related water quality conditions on enhanced coagulation removal of disinfection by-product precursors, which not only ignores During the coagulation reaction, the morphological change of the flocculant and its influence on the removal of the precursors of disinfection by-products did not consider the properties of the precursors of disinfection by-products and their interaction with different forms of flocculants and the reaction process.

Method used

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  • Control method for disinfection by-product based on matching of precursor form and flocculating agent form
  • Control method for disinfection by-product based on matching of precursor form and flocculating agent form

Examples

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Effect test

Embodiment 1

[0029] The humic acid water sample simulates the natural water body, and the alkalinity is 100mg / L (as CaCO 3 meter), the turbidity is 20NTU, and the dissolved organic carbon DOC is 3.96mg / L.

[0030] Judgment of the morphology of the precursors of disinfection by-products: the ultrafiltration fractionation method was used to determine that the precursors of high molecular weight (>100kDa) THMs accounted for 83%, and the initial concentration was 80.2μg / mg C.

[0031] In-situ form enhancement of flocculant during coagulation: polyaluminum chloride flocculant is selected, and the dosage is 19.9mg / L. After flocculant is added, stir rapidly at 200rpm / min for 2 minutes, and adjust rapidly during the rapid stirring process pH to 5.5, the dominant form is prefabricated Al 13 Morphology, then, 40rpm / min slow stirring for 15 minutes, settling for 30 minutes. The THMs precursor concentration reached 27.7 μg / mg C after coagulation treatment, which was 42.4% higher than the traditional...

Embodiment 2

[0033] The humic acid water sample simulates the natural water body, and the alkalinity is 100mg / L (as CaCO 3 meter), the turbidity is 20NTU, and the dissolved organic carbon DOC is 2.34mg / L.

[0034] Judgment of the form of the precursor of disinfection by-products: the form of the precursor of low molecular weight (<3kDa) HAAs was determined to account for 71% by ultrafiltration classification method, and the initial concentration was 28.1 μg / mg C.

[0035] In-situ morphology strengthening of flocculant during coagulation: choose traditional flocculant AlCl 3 , the dosage is 9.3mg / L. After the flocculant is added, stir rapidly at 200rpm / min for 2 minutes, and adjust the pH to 5.5 rapidly during the rapid stirring process. The dominant form is in-situ hydrolysis of Al 13 Morphology, then, 40rpm / min slow stirring for 15 minutes, settling for 30 minutes. After coagulation treatment, the concentration of HAAs precursor reached 10.9 μg / mg C, which was 56.7% higher than the trad...

Embodiment 3

[0037] The humic acid water sample simulates the natural water body, and the alkalinity is 100mg / L (as CaCO 3 meter), the turbidity is 20NTU, and the dissolved organic carbon DOC is 2.36mg / L.

[0038] Determination of the morphology of the precursors of disinfection by-products: the ultrafiltration fractionation method was used to determine that the precursors of HAAs in the high molecular weight range (30-100kDa) accounted for 79%, and the initial concentration was 19.5μg / mg C.

[0039] In-situ form enhancement of flocculant during coagulation: choose polyaluminum chloride flocculant, dosage is 11.9mg / L, after adding flocculant, stir rapidly at 200rpm / min for 2 minutes, adjust rapidly during rapid stirring When the pH reaches 7.5, the dominant form is aggregated Al 13 Morphology, then, 40rpm / min slow stirring for 15 minutes, settling for 30 minutes. After coagulation treatment, the concentration of HAAs precursor reached 6.1 μg / mg C, which was 27.9% higher than the traditio...

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Abstract

The invention relates to a control method for disinfection by-product based on matching of precursor form of disinfection by-product and flocculating agent form, belonging to drinking water processing technical field. The inventive method comprises following steps: selecting corresponding flocculating agent form having superior removing capability aiming at raw water with superior form distribution rule of different disinfection by-product precursors, using a matching relation of the flocculating agent original position form and the disinfection by-product superior form to greatly increase removing efficiency of the disinfection by-product precursors in a coagulation process under actions of compression of double electrode layers, charge neutrality, adsorption and surface complexation. The inventive method has advantages of high efficiency, economic and practicable performance and easy application in engineering, effectively strengthens generation of flocculating agent original position form in the coagulation process and significantly reduces generation of disinfection by-product in the chlorination process.The invention is mainly used for purifying drinking water from a polluted surface water source in a drinking water factory and is also used for secondary effluent advanced treatment in a sewage plant for reusing reclaimed water.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to an effective method for controlling disinfection by-products for drinking water treatment. This method optimizes the coagulation treatment process, an important link in the routine treatment of drinking water, to remove the precursors of disinfection by-products to the greatest extent, and then control the generation of disinfection by-products in the subsequent disinfection process to make up for the shortcomings of traditional coagulation. To ensure the safety of drinking water quality. Background technique [0002] Disinfection is an essential process link in the drinking water treatment process, and it is also an important barrier to ensure water quality hygiene and safety. However, the precursors of disinfection by-products such as natural organic matter in water can react with chlorine to form chlorinated disinfection by-products, which has become an imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 曲久辉赵赫刘会娟胡承志兰华春
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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