Feedwater treatment and disinfection process by converting multipoint free chlorine into chloramine

A technology for water supply treatment and free chlorine, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, sterilization/microdynamic water/sewage treatment, etc., to avoid violent fluctuations, high disinfection effect, and reduce disinfection The effect of by-product formation

Active Publication Date: 2012-09-12
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to treat the water body polluted by bromine and organic matter. It is difficult to achieve COD by using single chlorine or chloramine disinfection on the basis of conventional processes (coagulation, sedimentation, filtration, disinfection) to strengthen coagulation. Mn In the case of simultaneous control of disinfection by-products and disinfection by-products, a feedwater treatment and disinfection process that converts free chlorine into chloramines at multiple points is provided, in order to achieve disinfection by-products and microbial indicators without basically changing the structure of the water plant. , residual chlorine and COD Mn Simultaneous attainment control of values

Method used

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  • Feedwater treatment and disinfection process by converting multipoint free chlorine into chloramine
  • Feedwater treatment and disinfection process by converting multipoint free chlorine into chloramine

Examples

Experimental program
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Effect test

Embodiment 1

[0034] See figure 1 A kind of equipment for the feed water treatment and disinfection process that is used for multi-point free chlorine to be converted into chloramine as shown:

[0035] The sedimentation tank inlet channel 1 is connected to the sedimentation tank 2, and there is a sedimentation tank collection channel 4 at the rear end of the sedimentation tank, and the first chlorine injection point 3 is set at the sedimentation tank collection channel; the sedimentation tank 2 passes through the sedimentation tank outlet pipe 5 and filters Pool 6 is connected. The second chlorine injection point 7 is set on the pipeline at the water outlet place of the filter pond, and the third chlorine injection point 8 is set on the pipeline at the water inlet place before the pipeline enters the clear water pool 10; Ammonia nitrogen dosing point 9 is set on the pipeline between the chlorine injection point and the water inlet of the clean water pool; the clean water pool is connected ...

Embodiment 2

[0040] In this example, the effluent from the sedimentation tank of a waterworks plant is taken as the research object, and the influent flow rate of the water supply plant is 6100m 3 / h, COD of the effluent from the sedimentation tank Mn The value is 4.05mg / L, the ammonia nitrogen is 0.21mg / L, and the bromide ion is 160μg / L.

Embodiment 3

[0044] In this example, the effluent from the sedimentation tank of a waterworks plant is taken as the research object, and the influent flow rate of the water supply plant is 6400m 3 / h, COD of the effluent from the sedimentation tank Mn The value is 4.20mg / L, the ammonia nitrogen is 0.19mg / L, and the bromide ion is 160μg / L.

[0045] Apply the equipment of Example 1 to carry out the water supply treatment and disinfection process of converting free chlorine into chloramine at multiple points: the added chlorine is liquid chlorine gas, and the added ammonia nitrogen is liquid ammonia gas.

[0046] The liquid chlorine gas is added at the first chlorine injection point set at the catchment channel at the back end of the sedimentation tank of the water plant so that the content of the added chlorine in the treated water is 2mg / L, and the original flow from the sedimentation tank to the filter tank is used. There is a water distribution system to mix the treated water with chlori...

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Abstract

The invention belongs to control of feedwater treatment and disinfection by-products and particularly relates to a feedwater treatment and disinfection process by converting multipoint free chlorine into chloramine. On the basis of structures of precipitation-disinfection process stages of original conventional feedwater treatment processes of a conventional drinking water treatment plant, chlorine is fed for disinfection at two or three points, ammonia nitrogen is required to be fed at once after chlorine is feed at the last point, and accordingly, treated water can be disinfected further byconverting the free chlorine into chloramine in place. By the feedwater treatment and disinfection process, disinfection by-products can be effectively controlled, the COD (chemical oxygen demand) can be reduced to a great extent, and the feedwater treatment and disinfection process have great action on preventing forming of biomembranes of a filter tank and nitration of a pipe net is realized. Meanwhile, chlorine feed quantity can be adjusted flexibly according to the characteristics of water quality by means of multipoint chlorine feeding, and accordingly, severe fluctuation of residual chlorine quantity and ammonia nitrogen feed quantity is reduced, and safe and stable water supply of large and mid-size cities can be guaranteed effectively.

Description

technical field [0001] The invention belongs to the control of disinfection by-products in water supply treatment, in particular to a water supply treatment disinfection process in which multi-point free chlorine is converted into chloramine. Background technique [0002] Disinfection by-products (DBPs) have received widespread attention at home and abroad in the past three decades. There are 26 types of DBPs stipulated in the drinking water standard (GB5749-2006) that will be enforced on July 1, 2012 in my country. In the process of chlorine disinfection, free chlorine will react with the precursors of disinfection by-products in water to form halogenated DBPs with "three effects". When the content of organic matter in the water body is high, it may cause the disinfection by-products to exceed the standard. Among the strategies for controlling disinfection by-products, enhanced coagulation is widely used as the optimal solution recommended by the US Environmental Protectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/50
Inventor 曲久辉田川刘锐平刘会娟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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