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Method for preparing active absorbent and method for intensify water treatment thereby

An active adsorbent, water treatment technology, applied in the direction of adsorption water/sewage treatment, water/sludge/sewage treatment, sludge treatment, etc. Problems such as high consumption

Inactive Publication Date: 2005-06-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that in the filtration process, the increase of organic matter in the water has resulted in the ineffective removal of organic matter in the coagulation process, the excessive consumption of chemicals, the contamination of the filter material in the filter tank by organic matter, and the partial or complete loss of colloidal impurities. Adsorption and interception, filtration as a key barrier in the process is greatly weakened; turbidity and organic matter are not effectively intercepted in the filtration process, and more disinfection by-products are produced in the subsequent disinfection process
More deposition, corrosion, smell and secondary pollution caused by the reproduction of viruses and microorganisms will occur in the clean water pool and pipe network, all of which will have a very bad impact on human health
There are many ways to strengthen the removal of organic matter, among which adding powdered activated carbon to the reaction tank is a flexible and effective treatment method, but the price of activated carbon is relatively expensive, and the cost of water treatment will also be greatly increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0004] Specific embodiment one: this embodiment prepares the active adsorbent like this: a, the solid-liquid separation that the domestic sewage forms after biochemical treatment carries out mud-water separation by sedimentation; b, the sludge obtained in the sedimentation tank is dehydrated, in Dry at 100-130°C to constant weight, and grind the dry sludge into particles of 0.001-1mm; c. Immerse the dry sludge particles in acid, and contact them for 1-48 hours under stirring conditions to complete the sludge activation. The weight ratio of mud to acid is 1: (1~2); d. Gradually raise the temperature of the activated sludge to 400~1200℃ at a speed of 1~20℃ / min, keep it at 400~1200℃ for 30~180min, and then Grinding into particles of 0.001-1 mm to obtain an active adsorbent. The acid is hydrochloric acid or sulfuric acid.

specific Embodiment approach 2

[0005] Specific embodiment two: this embodiment strengthens water treatment like this: (one) raw water enters in the mixing tank, and chemical agent is added in the mixing tank, (two) raw water and chemical agent are mixed and reacted through the reaction tank, and then The sediment produced in the reaction tank is separated from the mud and water through the sedimentation tank; (3) The effluent from the sedimentation tank is filtered and sterilized through the filter tank and the disinfection tank in turn to obtain qualified effluent. The core part of this method is to add active adsorption to the reaction tank agent. The dosage of the chemical agents is 1-100 mg / L. The chemical agent is iron salt or aluminum salt, such as FeCl 3 , Fe 2 (SO4) 3 , polyferric sulfate, AlCl 3 、Al 2 (SO4) 3 , polyaluminum chloride, etc. The dosage of the active adsorbent is 1-500mg / L.

specific Embodiment approach 3

[0006] Embodiment 3: This embodiment is different from Embodiment 2 in that 0-5 mg / L oxidant is added before the chemical agent is added. Other processes are the same as in the second embodiment. The oxidizing agent is one or a mixture of ozone, ferrate, permanganate, chlorine and chlorine dioxide.

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Abstract

The way to produce active attaching dose and the way of handling by strong water, concerns the way of produce active attaching dose using mire in the mire handling craft and the technique of strengthen water handling using the active attaching dose. The way to get the active attaching dose: handling the living dirty water to the solid-liquid separating thing, and filter them to separate the mire and water; heat the mire after filtered, crash them to grains; dip the grains into the acid, finish activating by mixing; heat, crash, then the active attaching dose is made. The way to strengthen the water by active attaching dose is: put the original water into the mixing pond, reaction pond, filtering pond, disinfecting pond, adding chemical dose into the mixing pond, adding mud attaching dose into the reaction pond. The mud attaching dose hydrochloric acid' fusing rate can attain round to 0.25%, NaOH's fusing rate is around 1.05%, after filtered the mud missing rate increase 10%--40%, organic pollution matter missing rate increase 10%--40%.

Description

Technical field: [0001] The invention relates to a method for preparing an active adsorption material from sludge produced in a sewage biochemical treatment process and a technology for using the active adsorption material to strengthen water treatment. Background technique: [0002] At present, the treatment process commonly used in urban water treatment in my country is: coagulation→sedimentation→filtration→disinfection multi-level barrier process flow, among which coagulation and filtration are the key links to ensure water quality. Studies have shown that in the process of filtration, the increase of organic matter in water leads to the ineffective removal of organic matter in the coagulation process, the excessive consumption of chemicals, the contamination of the filter material in the filter tank by organic matter, and the partial or complete loss of colloidal impurities. Adsorption and interception, filtration as a key barrier in the process is greatly weakened; turb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/00C02F1/28C02F11/00
Inventor 许国仁
Owner HARBIN INST OF TECH
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