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Method for controlling production of algae chlorinated disinfection byproduct by using potassium permanganate and calcium ion

A potassium permanganate and chlorination disinfection technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of harmful drinking water treatment structures, drinking water quality deterioration, and affecting water bodies Environmental and other issues, to achieve the effect of reducing the generation of disinfection by-products, easy upgrading and transformation, and obvious inhibitory effect

Active Publication Date: 2013-08-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the aggravation of eutrophication, sudden algae pollution incidents occur from time to time, seriously affecting the water environment, and endangering drinking water treatment structures, leading to deterioration of drinking water quality
In the conventional water treatment process, due to the strong negative charge, steric effect and stereo effect of algae, it is difficult to effectively remove algae by existing methods; and the remaining algae in the water can significantly deteriorate the quality of drinking water, such as producing smell, increasing turbidity and disinfection by-product
In order to strengthen algae removal, people often use ozone and chlorine to pre-oxidize high-algae water, but chlorine pre-oxidation can increase the disinfection by-products of subsequent algae; also because ozone pre-oxidation can destroy algae cell walls and cell membranes, so that the algae cells inside Dissolved organic matter is released into the water, thereby significantly increasing the organic matter in the disinfection tank, which in turn leads to a significant increase in chlorination disinfection by-products
[0003] "Potassium permanganate pre-oxidation controls the generation of haloacetic acid in chlorine / chloramine disinfection (Chen Zhonglin et al., Journal of Environmental Science, Volume 26, No. 7, Page 1082-1086, July 2006)" A method of using potassium permanganate pre-oxidation to control the formation of algae chlorinated disinfection by-products, but only for the control of conventional haloacetic acid, a disinfection by-product, so there is a treatment for other nitrogen-containing chlorinated disinfection by-products The problem of poor performance

Method used

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  • Method for controlling production of algae chlorinated disinfection byproduct by using potassium permanganate and calcium ion

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specific Embodiment approach 1

[0015] Specific embodiment one: the method that present embodiment utilizes potassium permanganate and calcium ion to control algae chlorinated disinfection by-products to generate is carried out according to the following steps: Add potassium permanganate to a concentration of 0.2-3mg / L, and at the same time add calcium chloride or calcium sulfate until the concentration of calcium ions in the water is 5-40mg / L, and react for 1-10min for pretreatment; 2. Pretreatment The final water is imported into the water treatment structure for follow-up water treatment, that is, the generation of by-products of algae chlorination disinfection is completed by utilizing potassium permanganate and calcium ions; wherein the water to be treated in step 1 is that the concentration of algae is 10 6 ~10 10 unit / L of surface water, the pH value is 5.5-8.5.

[0016] The surface water in step 1 of this embodiment refers to surface lake water, reservoir water, and river water.

[0017] Potassium ...

specific Embodiment approach 2

[0023] Specific embodiment two: The difference between this embodiment and specific embodiment one is that in step one, before the coagulation tank or at the water inlet of the coagulation tank, potassium permanganate is added to the water to be treated until the concentration is 0.5-2.5mg / L, add calcium chloride or calcium sulfate at the same time until the calcium ion concentration in the water is 10-35 mg / L, and react for 2-8 minutes for pretreatment. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0024] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step one, before the coagulation tank or at the water inlet of the coagulation tank, potassium permanganate is added to the water to be treated until the concentration is 1mg / L, and at the same time Add calcium chloride or calcium sulfate until the calcium ion concentration in the water is 20 mg / L, and react for 5 minutes for pretreatment. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a method for controlling production of an algae chlorinated disinfection byproduct by using potassium permanganate and calcium ion, and relates to a method for controlling production of the algae chlorinated disinfection byproduct. The method comprises the following steps of: firstly, adding potassium permanganate to the water to be treated in front of a coagulating basin or at a coagulating basin water inlet, and simultaneously adding calcium chloride or calcium sulfate for pretreatment; and secondly, introducing the pretreated water to a water treatment structure forsubsequent water treatment. With the adoption of the method, the removing rate of algae is as high as 95%; compared with the traditional process, the method can improve algae cell removing rate by 10-45%; the method has very obvious inhibition effect on the produced sterilizing byproduct, can reduce the production of most sterilizing byproducts by 10-40% in general and has obvious inhibition effect on a nitrogenous sterilizing byproduct; in addition, the operation is simple, the investment is less, the running cost is lower, and it is very easy to upgrade and reform the traditional water works.

Description

technical field [0001] The invention relates to a method for controlling the generation of algae chlorination disinfection by-products. Background technique [0002] With the aggravation of eutrophication, sudden algae pollution incidents occur from time to time, seriously affecting the water environment, and endangering drinking water treatment structures, resulting in the deterioration of drinking water quality. In the conventional water treatment process, due to the strong negative charge, steric effect and stereo effect of algae, it is difficult to effectively remove algae by existing methods; and the remaining algae in the water can significantly deteriorate the quality of drinking water, such as producing smell, increasing turbidity and disinfection by-product. In order to strengthen algae removal, people often use ozone and chlorine to pre-oxidize high-algae water, but chlorine pre-oxidation can increase the disinfection by-products of subsequent algae; also because ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/50
Inventor 马军谢鹏超方晶云关英红李旭春陈丽玮岳思阳邹景
Owner HARBIN INST OF TECH