Method used for purifying slightly polluted drinking water

A drinking water treatment and micro-pollution technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of low water supply load and poor circulation, and save land occupation area, reduce energy consumption, and ensure biological safety

Inactive Publication Date: 2019-01-11
JINAN JIANDA ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of low load and poor circulation of microbial contact oxidation feed water, the purpose of the present invention is to propose a biological oxidation-cross-flow ultrafiltration water purification process

Method used

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  • Method used for purifying slightly polluted drinking water
  • Method used for purifying slightly polluted drinking water
  • Method used for purifying slightly polluted drinking water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A treatment process for purifying organic polluted water, the purification process is:

[0030] (1) The raw water enters the biological oxidation tank, and the sludge concentration on the filler is maintained at 2.5KgMLSS / m 2 , The hydraulic retention time is 2h, and the dissolved oxygen is maintained at about 2mg / L;

[0031] (2) The effluent from the biological oxidation tank enters the flocculation tank, the polyaluminum chloride is used as the flocculant, the dosage is 3mg / L, and the flocculation stirring time is 15min;

[0032] (3) The effluent from the flocculation tank enters the inclined tube sedimentation tank with a hydraulic retention time of 1.5h;

[0033] (4) The effluent of the sedimentation tank is pumped into the ultrafiltration membrane equipment for cross-flow ultrafiltration. The membrane flux of the ultrafiltration membrane is 50L / (m) 2 ·H), the backwash intensity is 13 / m 2 ·S, the recoil duration is 5min, and the recoil interval is 3h;

Embodiment 2

[0035] A treatment process for purifying organic polluted water, the purification process is:

[0036] (1) The raw water enters the biological oxidation tank, and the sludge concentration on the filler is maintained at 3KgMLSS / m 2 , The hydraulic retention time is 2h, and the dissolved oxygen is maintained at about 2.5mg / L;

[0037] (2) The effluent from the biological oxidation tank enters the flocculation tank, the polyaluminum chloride is used as the flocculant, the dosage is 3mg / L, and the flocculation stirring time is 15min;

[0038] (3) The effluent from the flocculation tank enters the inclined tube sedimentation tank with a hydraulic retention time of 1.5h;

[0039] (4) The effluent of the sedimentation tank is pumped into the ultrafiltration membrane equipment for cross-flow ultrafiltration. The membrane flux of the ultrafiltration membrane is 50L / (m) 2 ·H), the backwash intensity is 16 / m 2 ·S, the recoil duration is 5min, and the recoil interval is 2h;

Embodiment 3

[0041] A treatment process for purifying organic polluted water, the purification process is:

[0042] (1) The raw water enters the biological oxidation tank, and the sludge concentration on the filler is maintained at 3.5KgMLSS / m 2 , The hydraulic retention time is 2h, and the dissolved oxygen is maintained at about 2.5mg / L;

[0043] (2) The effluent from the biological oxidation tank enters the flocculation tank, the polyaluminum chloride is used as the flocculant, the dosage is 3mg / L, and the flocculation stirring time is 15min;

[0044] (3) The effluent from the flocculation tank enters the inclined tube sedimentation tank with a hydraulic retention time of 1.5h;

[0045] (4) The effluent of the sedimentation tank is pumped into the ultrafiltration membrane equipment for cross-flow ultrafiltration. The membrane flux of the ultrafiltration membrane is 50L / (m) 2 ·H), the backwash intensity is 16 / m 2 ·S, the recoil duration is 5min, and the recoil interval is 1.5h;

[0046] The results...

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Abstract

The invention discloses a method used for purifying slightly polluted drinking water. According to the method, raw water is introduced into a high load biological oxidation pool for complete biodegradation; discharged water is introduced into a flocculation basin and a sedimentation basin successively; an obtained supernatant is pumped into an ultrafilter membrane assembly for crossflow filtration; ultrafiltration discharged water is introduced into a clean water tank for chlorine disinfection and discharging, a concentrate and a backwash waste liquid from the ultrafilter membrane assembly arerecycled back into the biological oxidation pool for circulation processing. According to the method, organic combination of biological oxidation and crossflow untrafiltration is adopted, and a conventional biological oxidation is optimized so as to solve problems in the prior art that water feeding processing load capacity is low, routine dead end filtration water discharge amount is low, and energy consumption is high; the method is capable of increasing removing effect on small molecular dissolvable organic matters, ensuring the biological safety of discharged water, reducing land occupation area, and reducing water production energy consumption. The specific flow is disclosed in a graph in the invention.

Description

Technical field [0001] The invention relates to the technical field of water treatment and purification, in particular to a process for organically combining biological treatment and membrane treatment to treat dissolved organic matter. Background technique [0002] The influent water of urban waterworks contains a variety of organic and inorganic substances, especially in waterworks where surface water is the source of water, the content of dissolved organic matter is high. According to investigations and studies, the current drinking water sources in most parts of the north are mainly light organic pollution, and the main pollutants are small molecular organic matter and algal toxins. [0003] The traditional coagulation, precipitation and filtration processes have poor removal effect on dissolved organic matter, especially for small molecular organic matter, basically no removal effect; currently used ozone-activated carbon, nanofiltration, reverse osmosis, ion exchange resin, e...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30
CPCC02F9/00C02F2001/007C02F2101/30C02F2301/08C02F2303/04C02F1/444C02F1/5236C02F1/52C02F3/02
Inventor 刘昌明任仰龙李艳芳
Owner JINAN JIANDA ENVIRONMENTAL PROTECTION TECH CO LTD
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