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Alkaline chemical deposition treatment method for overproof metal pollution in water

A treatment method and chemical precipitation technology, applied in water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. Simple to use effects

Inactive Publication Date: 2008-07-09
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide an alkaline chemical precipitation treatment method to deal with excessive metal pollutants in water, so as to realize the economical, safe and high-efficiency guarantee of normal water supply in the urban water supply industry when the water source water is suddenly polluted by metal, so as to solve the current problem of drinking water treatment The process cannot cope with the situation that the metal pollutants in the water source exceed the standard

Method used

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  • Alkaline chemical deposition treatment method for overproof metal pollution in water
  • Alkaline chemical deposition treatment method for overproof metal pollution in water
  • Alkaline chemical deposition treatment method for overproof metal pollution in water

Examples

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Effect test

Embodiment 1

[0065] Example 1, emergency cadmium removal process of Nanhua Water Plant, Shunde City, Guangdong Province

[0066] During December 5-14, 2005, Shaoguan Smelter's equipment maintenance period exceeded the standard discharge of cadmium-containing wastewater, resulting in excessive heavy metal cadmium in the Shaoguan section of Beijiang River in Guangdong Province. The drinking water sources of cities such as Shaoguan and Yingde in the middle reaches of the Beijiang River are under threat. The Nanhua Water Plant in Yingde City has stopped running water supply since December 17. According to the characteristics of the cadmium pollution event in Beijiang River and the production conditions of water supply enterprises in cities along the river, the inventor proposed an emergency cadmium removal water purification process based on coagulation and sedimentation under weak alkaline conditions. This technology was first implemented in Nanhua Water Plant of Yingde City.

[0067] The wat...

Embodiment 2

[0084] Example 2, emergency cadmium removal process for water plants affiliated to Xiangtan and Changsha, Hunan Province

[0085] On January 4, 2006, a similar cadmium pollution incident occurred in the Changsha section of the Xiangjiang River in Hunan Province. According to the experience of Guangdong Beijiang emergency cadmium removal water purification process, under the guidance of the inventor, the tap water plants in Xiangtan City and Changsha City have adopted the same implementation mode as in Example 1. The alkaline agent added was changed from sodium hydroxide to lime to improve the effect of cadmium removal, which effectively dealt with water pollution incidents and ensured the local drinking water supply.

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Abstract

The invention relates to a chemical deposit treating method for over-proof metal pollutant in water, belonging to the technical field of water treatment. The invention is characterized in that adding alkaline drug in the water to increase pH value, which causes the metal pollutant to generate insoluble matter of hydroxide and carbonates, then adding coagulating agent to cause the metal insoluble matter and alum blossom to deposit together and adding acid to adjust the pH value to neutral after removing the sediment. The chemical deposit treating method for over-proof metal pollutant in water of the invention can response to the metal pollutants of cadmium, zinc, lead, mercury, nickel, copper, silver, beryllium and the like regulated in related water quality standard of drinking water, also can response to the one metal pollutant or simultaneous occurrence of a plurality of metal pollutants of which the over-proof density highly reaches thousands of times. The device and operation are simple and the operating cost is not high, thereby the invention doesn't influence the water quality of the tap water plant and is convenient for using in water plant, which can highly effectively, safely and economically realize city water supply when the water source water metal pollution is over proof, further, the invention can be used for treatment of industrial water.

Description

technical field [0001] The invention relates to a method for treating excessive metal pollutants in water, in particular to a chemical precipitation treatment method developed to deal with sudden metal pollution of drinking water sources, and belongs to the field of water treatment. Background technique [0002] Since the drinking water source water quality standard requires that the pollutants in it shall not exceed a certain limit, drinking water treatment usually does not require the treatment of metal pollutants. However, when drinking water sources are polluted by sewage containing a large amount of metal pollutants, urban water supply companies have to face the problem of dealing with excessive metal pollutants. [0003] At present, the treatment methods commonly used in the drinking water industry include the following two types: [0004] 1. Increase the dosage of coagulant [0005] Due to the physical and chemical characteristics of metal ions, this method has a li...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F1/52C02F1/58
Inventor 张晓健张悦陈超王欢刘锦红杨学波王建平申石泉林朝晖董玉莲陈诚
Owner TSINGHUA UNIV
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