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Device and method for controlling residual aluminum concentration in high pH raw water treatment process

A treatment process, residual aluminum technology, applied in water treatment parameter control, special compound water treatment, neutralization water/sewage treatment, etc., can solve the problem of high residual aluminum concentration in factory water, strict preparation reaction conditions, production There are many raw material components, etc., to achieve the effect of stable and reliable adjustment effect, simple selection, and improved use efficiency

Active Publication Date: 2016-05-04
SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are mainly three kinds of coagulants, which are: (1) coagulants made of water glass, magnesium chloride or magnesium sulfate, aluminum sulfate or aluminum chloride, and sodium aluminate. The concentration is close to 0.1mg / L, which meets the sanitary standard of drinking water; however, the coagulant has the problems of complex preparation process, strict requirements on preparation reaction conditions, many raw materials used in production, and high cost
(2) Using high-polymer polysulfide aluminum chloride as coagulant, using this method to synthesize low-residual aluminum coagulant, compared with traditional polyaluminum chloride, the amount of coagulant dosage is reduced by more than 20%, but its preparation In the process, it needs to be aged at room temperature for 5 days to obtain stable high polyaluminum sulfide chloride. The production cycle is long, which is not conducive to commercial production, and the applicability is not good
When the pH of the raw water entering the water plant is > 8.0, the coagulant cannot solve the problem of high residual aluminum concentration in the outgoing water

Method used

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  • Device and method for controlling residual aluminum concentration in high pH raw water treatment process
  • Device and method for controlling residual aluminum concentration in high pH raw water treatment process

Examples

Experimental program
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Effect test

Embodiment 1

[0072] First, the raw water of a reservoir in the south was selected as the raw water for the experiment. The turbidity of the raw water entering the plant was 2.32 NTU, the water temperature was 21.2 °C, the total aluminum was 0.23 mg / L, and the pH = 8.974. The coagulant was aluminum sulfate, of which Al 2 o 3 The content is 7.8%;

[0073] Then, according to the drinking water standard inspection method metal index GB5750.6-2006, the aluminum concentration in the water was determined by inductively coupled plasma mass spectrometry;

[0074] Then, measure equal volumes of raw water into two beakers respectively, and mark them as standard sample 1 and standard sample 2;

[0075] Then, pass pure carbon dioxide gas into the standard sample 1, and control the dosage of carbon dioxide through the flowmeters at the inlet and outlet until the pH value of the raw water is adjusted from 8.974 to 7.524. At this time, the dosage of carbon dioxide is 79mg / L .

[0076] Then, take 1000ml...

Embodiment 2

[0079]First, the raw water of a reservoir in the south was selected as the raw water for the experiment. The turbidity of the raw water entering the plant was 2.60 NTU, the water temperature was 16.3 °C, the total aluminum was 0.11 mg / L, and the pH = 8.271. The coagulant was aluminum sulfate, of which Al 2 o 3 The content is 7.8%;

[0080] Then, according to the drinking water standard inspection method metal index GB5750.6-2006, the aluminum concentration in the water was determined by inductively coupled plasma mass spectrometry;

[0081] Then, measure equal volumes of raw water into two beakers respectively, and mark them as standard sample 1 and standard sample 2;

[0082] Then, pass pure carbon dioxide gas into the standard sample 1, and control the dosage of carbon dioxide through the flowmeters at the inlet and outlet until the pH value of the raw water is adjusted from 8.271 to 7.320. At this time, the dosage of carbon dioxide is 79mg / L .

[0083] Then, take 1000ml ...

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Abstract

The invention belongs to the technical field of water treatment, and provides a device and a method for controlling the concentration of residual aluminum in the process of high pH raw water treatment. The device comprises a liquid storage tank, a pressure reducing valve, a gas flowmeter, a linear motion electric control valve, a water jet, a pH on-line monitoring instrument, a central processing unit, a memory, a signal input / output port and a display, wherein the liquid storage tank is used for storing pure carbon dioxide, the pressure reducing valve is used for restoring the pressure of carbon dioxide gas in the liquid storage tank to a normal pressure, the gas flowmeter is used for monitoring the flow rate of the carbon dioxide gas, the linear motion electric control valve is used for regulating the flow rate of the fed carbon dioxide gas, and the carbon dioxide is fed by the water jet; the pH on-line monitoring instrument is used for carrying out continuous monitoring on the pH value of water; and the central processing unit is connected with the memory, the signal input / output port, the display, the pH on-line monitoring instrument and the linear motion electric control valve. According to the invention, no coagulant is required to be prepared; and the device and method disclosed by the invention have the advantages that the process is simple, the production cycle is short, the cost is low, the product is more pure, and the concentration of residual aluminum is reduced in high pH raw water environments.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a device and a method for controlling residual aluminum concentration in a high-pH raw water treatment process. Background technique [0002] Clinical medicine and environmental medicine studies have shown that: excessive intake of aluminum will interfere with the memory function of the human brain, leading to Alzheimer's disease; aluminum accumulation in the bones will cause osteomalacia; Calcium metabolism, causing many diseases. From the perspectives of health, safety, sanitation, and feasibility, countries all over the world have made strict requirements on the concentration of aluminum in drinking water. For example, the World Health Organization (WHO) stipulates that the aluminum concentration in drinking water is ≤0.20mg / L. The United States, the United Kingdom, Germany, Belgium and other countries have stricter restrictions on the concentration of al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCC02F1/52C02F1/66C02F2209/003C02F2209/06C02F2305/02C02F2305/14
Inventor 周文琪叶辉扈敏扬夏萍张东黄怡
Owner SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT
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