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Method for removing sulfate from water through aluminum-calcium step-by-step flocculation precipitation

A technology for removing water and sulfate, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as high cost and complicated process, and achieve low pollution and high treatment efficiency High, simple method and effect

Active Publication Date: 2016-01-20
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of high cost and complicated process of the existing method for removing sulfate, and provide a method for removing sulfate in water by aluminum-calcium step-by-step flocculation precipitation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0019] Embodiment 1: The method for removing sulfate in water by aluminum-calcium step-by-step flocculation precipitation described in this embodiment is carried out according to the following steps:

[0020] 1. Add a certain amount of acid solution to the water so that the pH value of the water body is 6-7.2, and then add polyaluminum chloride (PAC) to the water. After the PAC is dissolved, add aluminum ions to the water to be treated, and continue to stir until completely Dissolve, get mixture a, PAC in mixture a (with active ingredient Al 2 o 3 The molar ratio of the added aluminum ion to the added aluminum ion is 0.3~0.5:1, and the concentrations of PAC and the added aluminum ion in the mixture a are respectively 0.05~0.08g / L and 0.013~0.02g / L;

[0021] Two, add quicklime or slaked lime suspension in mixture a, the mol ratio of quicklime or slaked lime and the aluminum ion described in step 1 is 5~6: 1, and the concentration (calculated by calcium ion) of quicklime or sla...

specific Embodiment approach 2

[0024] Embodiment 2: This embodiment is different from Embodiment 1 in that the aluminum ions described in step 1 can be provided by one or a mixture of aluminum chloride and aluminum nitrate. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0025] Embodiment 3: The difference between this embodiment and one of Embodiments 1 to 2 is that the acid solution described in steps 1 and 3 is hydrochloric acid. Others are the same as one of the specific embodiments 1 to 2.

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Abstract

The invention provides a method for removing sulfate from water through aluminum-calcium step-by-step flocculation precipitation, and relates to a method for removing sulfate from water. A purpose of the present invention is to solve the technical problems of high cost and complex process of the existing sulfate removing method. The method comprises: adding an acid liquid and poly aluminium chloride (PAC) to water, pouring aluminum ions, stirring to obtain a mixture a, adding a quick lime or slaked lime suspension to the mixture a, stirring, standing, carrying out solid-liquid separation, and adjusting the pH value so as to complete the process. According to the present invention, the micro floc and the aluminum salt are adopted as the crystal nucleus, and are combined with the calcium ions and the sulfate ions under the alkaline conditions to produce the water-insoluble complex CanAl2m(SO4)3x(OH)12.zH2O; and the selected agents such as the aluminum salt and the quick lime or slaked lime have characteristics of wide sources and low price, such that the running cost of the overstandard sulfate water body treatment using the method is low. In addition, the present invention belongs to the water treatment field.

Description

technical field [0001] The invention relates to a method for removing sulfate in water. Background technique [0002] At present, my country's water environment pollution has become an important fetter restricting the development of the national economy, and has also become the focus of attention of the government and the people. Statistics show that the quality of surface water and groundwater in many rivers and lakes is deteriorating day by day, and drinking water sources for residents are threatened by serious pollution. In mining areas in Ningxia, Xinjiang, Yunnan and other regions, excessive sulfate in surface water and groundwater is now a common water pollution problem. Excessive sulfate in water will damage the water ecological environment and endanger the growth of aquatic organisms; long-term drinking is prone to diarrhea, intestinal dysfunction and other diseases; in agriculture, using water with excessive sulfate for irrigation will destroy the soil structure, f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 艾恒雨汪明明范潇梦张海棚
Owner HARBIN UNIV OF SCI & TECH