Method for removing organic matters in reclaimed water by using in situ FeOxHy

An in-situ generation of ferric hydroxide technology, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of low adsorbent efficiency, small floc particle size, and increased iron salt dosage, etc. Achieve the effects of reducing turbidity and particulate matter concentration, simple operation process and low engineering investment cost

Inactive Publication Date: 2013-08-21
BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organic matter in the effluent of urban sewage plants often coexists with suspended particulate matter and ammonia nitrogen, and the above pollutants will also consume coagulants and greatly increase the dosage of iron salts
For the effluent of sewage plants with low alkalinity and weak buffer capacity, if the iron-salt coagulation process is used to remove organic matter, there will often be incomplete hydrolysis of iron-salt, small floc particle si

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A reclaimed water plant uses the secondary effluent of the urban sewage plant as the water source, and the treatment process adopted is hydraulic mixed reaction-advection sedimentation-quartz sand filtration. Organic content COD in raw water Cr The turbidity is 85mg / L, the turbidity is 20NTU, the pH value is 6.5, the total alkalinity in water is 240mg / L, the flocculant used is ferric chloride, and the flocculant dosage is 50mg / L, but the treatment effect is not ideal, the performance The turbidity of the water after sinking and filtration is relatively high, the removal rate of organic matter in the water after sinking is only 50%, and the filtration cycle of the filter is 20 hours.

[0033] Adopting the method of the present invention to strengthen removal of organic matter: 1) dissolving sodium hydroxide and ferric chloride under sufficient stirring to obtain sodium hydroxide solution and ferric chloride solution respectively. 2) Add sodium hydroxide solution and fer...

Embodiment 2

[0035] A reclaimed water plant uses the secondary effluent of the urban sewage plant as the water source, and the treatment process adopted is mechanical mixing reaction-slope plate sedimentation-multi-media filtration. Organic content COD in raw water Cr The turbidity is 90mg / L, the turbidity is 25NTU, the pH value is 7.1, and the total alkalinity in water is 220mg / L. The flocculant used is polymeric ferric chloride, and the flocculant dosage is 40mg / L, but the treatment effect is not satisfactory. The turbidity of the sinking water and filtered water is relatively high, the removal rate of organic matter in the sinking water is only 50%, and the filtration cycle of the filter is 22 hours.

[0036] Adopting the method of the present invention to strengthen organic matter removal: 1) dissolving potassium hydroxide and polyferric chloride under sufficient stirring to obtain potassium hydroxide solution and polyferric chloride solution respectively. 2) Potassium hydroxide solut...

Embodiment 3

[0038] A reclaimed water plant uses the secondary effluent of the urban sewage plant as the water source, and the treatment process adopted is hydraulic mixed reaction-incline tube sedimentation-submerged ultrafiltration membrane filtration. Organic content COD in raw water Cr The turbidity is 100mg / L, the turbidity is 30NTU, the pH value is 7.2, and the total alkalinity in water is 275mg / L. The flocculant used is ferric sulfate, and the flocculant dosage is 60mg / L, but the treatment effect is not ideal, and it shows as sinking water , The turbidity of filtered water is high, the removal rate of organic matter in sinking water is only 50%, and the ultrafiltration membrane backwash cycle is 20 hours.

[0039] Adopting the method of the present invention to strengthen organic matter removal: 1) dissolving sodium hydroxide and ferric sulfate under sufficient stirring to obtain sodium hydroxide solution and ferric sulfate solution respectively. 2) Add the sodium hydroxide solutio...

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Abstract

The invention relates to the field of treatment of reclaimed water, especially to a method for removing organic matters in reclaimed water by using in situ FeOxHy. Directed at the problem that secondary effluent of a municipal sewage plant has high content of organic matters, the invention brings forward the method of improving removal effects of coagulation, deposition and filtration units of a reclaimed water plant on organic matters by using combined action of an alkali salt and a ferric salt, wherein an alkali salt solution and a ferric salt solution are added according to a certain mol ratio and react with each other to produce in situ FeOxHy which enables organic matters in water to be agglomerated and adsorbed and settling properties of floc to be improved, and removal of the organic matters is further realized by using a solid-liquid separation reactor. The method can be used for deep purification of secondary effluent of the municipal sewage plant and is also applicable to a reclaimed water treatment project using effluent of the municipal sewage plant or rainwater as a water source.

Description

technical field [0001] The invention belongs to the technical field of regenerated water treatment, and in particular relates to a method of using in situ to generate iron hydroxyhydroxide In situ FeO x h y Method for removing organic matter in reclaimed water. Background technique [0002] There are often high concentrations of dissolved organic matter (DOM), low doses of estrogen and other small molecular organics in the effluent of urban sewage plants (ie, raw water for reclaimed water). Many reclaimed water purification processes cannot effectively remove the above-mentioned risk pollutants; on the other hand, some pollutants in the water may be converted into more toxic by-products in the purification and disinfection process, thereby significantly increasing the water quality safety risk. [0003] The coagulation and sedimentation method has remarkable effect in removing pollutants in water, stable operation, and can also effectively remove chroma, turbidity, SS, COD...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F9/02B01J20/06B01J20/30C02F101/30
Inventor 孙丽华张雅君许萍冯萃敏齐晓璐
Owner BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
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