Environment-friendly flocculant for treating tap water

A flocculant and tap water technology, which is applied in the application field of environmental-friendly tap water flocculant in tap water treatment, can solve the problems of secondary pollution of water body, etc., and achieve the effect of fast sedimentation speed, remarkable flocculation effect and stable quality

Inactive Publication Date: 2010-10-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the most commonly used flocculant for tap water treatment in my country is polyaluminum trichloride (CF-PAC), because it will inevitably introduce aluminum ions in the process of tap water treatment, which will bring secondary pollution to the water body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First weigh 99.6g of formic acid with a mass concentration of 2%, add it to the reactor, add 0.4g of natural high molecular polysaccharide under constant stirring, and stir for 3.5 hours at 15°C to form a natural high molecular polysaccharide with a mass content of 0.4%. dilute acid solution;

[0029] Then add 2 g of polyaluminum trichloride (CF-PAC) to 1000 mL of distilled water, mix uniformly at room temperature, and make a polyaluminum trichloride solution with a mass content of 0.2%;

[0030] The auxiliary agent A solution is prepared by mixing uniformly in a mass ratio of sodium hydroxide: sodium bicarbonate: aluminum chloride: montmorillonite: water = 1:1:1:5:92;

[0031] Take 200mL of raw water from the Changjiang River in Wuhan City, Hubei Province, and its turbidity is measured to be 70NTU. Add 0.4mL of polyaluminum chloride solution, 0.8mL of natural polymer polysaccharide solution, and auxiliary agent A solution in sequence at a stirring speed of 250r / min. 1...

Embodiment 2

[0033] First weigh 99.2g of formic acid with a mass concentration of 3%, add it to the reactor, add 0.8g of natural high molecular polysaccharide under constant stirring, and stir for 4.0 hours at 20°C to form a natural high molecular polysaccharide with a mass content of 0.8%. dilute acid solution;

[0034] Then add 4 g of polyaluminum trichloride (CF-PAC) to 1000 mL of distilled water, mix uniformly at room temperature, and make a polyaluminum trichloride solution with a mass content of 0.4%;

[0035] Auxiliary agent A solution is obtained by the same method as in Example 1;

[0036] Take 200mL of raw water from the Changjiang River in Wuhan City, Hubei Province, and its turbidity is measured to be 80NTU. Then add 0.5mL of polyaluminum chloride solution, 1.2mL of natural polymer polysaccharide solution, and 1.2mL of additive A solution at a stirring speed of 250r / min. mL, stirred for 2min, then stirred at a stirring speed of 60r / min for 5min, and finally stood still for 20m...

Embodiment 3

[0038]First weigh 98.8g of formic acid with a mass concentration of 4%, add it to the reactor, add 1.2g of natural high molecular polysaccharide under constant stirring, and stir for 4.5 hours at 25°C to form a natural high molecular polysaccharide with a mass content of 1.2%. dilute acid solution;

[0039] Then add 6 g of polyaluminum trichloride (CF-PAC) to 1000 mL of distilled water, mix uniformly at room temperature, and make a polyaluminum trichloride solution with a mass content of 0.6%;

[0040] Auxiliary agent A solution is obtained by the same method as in Example 1;

[0041] Take 200mL of raw water from the Changjiang River in Wuhan City, Hubei Province, and its turbidity is measured to be 90NTU. Then add 0.6mL of polyaluminum chloride solution, 1.6mL of natural polymer polysaccharide solution, and 1.4mL of additive A solution at a stirring speed of 250r / min. mL, stirred for 2min, then stirred at a stirring speed of 60r / min for 5min, and finally stood still for 20mi...

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Abstract

An environment-friendly flocculant for treating tap water The flocculant is characterized by using poly aluminium trichloride solution, natural polymer polysaccharide solution and auxiliary agent A solution in a coordinated way, wherein the poly aluminium trichloride solution has mass percent of 0.1-1%; the natural polymer polysaccharide solution is dilute acid solution with mass content of 0.2-2%; the auxiliary agent A solution is compound solution of sodium hydroxide, sodium bicarbonate, aluminum chloride, montmorillonite and water; and the montmorillonite accounts for 5% of the total mass of the compound solution. The best volume ratio of poly aluminium trichloride solution to natural polymer polysaccharide solution to auxiliary agent A solution used by the flocculant is equal to 0.5-5:3-10:5-10. The flocculant has large flocculation particles and high sedimentation velocity and has removal rate of raw water turbidity up to 98.09%. The raw water turbidity can be within 3NTU, the national standard, through one-time treatment when the raw water turbidity is between 70NTU and 100NTU. The content of aluminum ions in the effluent is 57.5% less than the content of aluminum ions in the traditional flocculants, the medicines for treating the tap water are little, and the flocculant does not contain the components harming the human bodies and has excellent performance and stable quality.

Description

technical field [0001] The invention belongs to the field of tap water treatment and relates to the application of an environment-friendly tap water flocculant in tap water treatment. Background technique [0002] At present, the most commonly used flocculant for tap water treatment in my country is polyaluminum trichloride (CF-PAC), because it will inevitably introduce aluminum ions in the process of tap water treatment, which will bring secondary pollution to the water body. After the residual aluminum in tap water enters the human body, part of it is excreted with feces, and the rest is enriched in blood, muscle, bone and other tissues and organs. When the concentration of aluminum in the body exceeds a certain value, it will cause biological lesion. Long-term intake of aluminum ions can lead to various diseases such as cerebral dementia and osteoporosis, and endanger human health. [0003] Therefore, in order to overcome some shortcomings of traditional flocculants, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 曾德芳翟勇
Owner WUHAN UNIV OF TECH
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