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Wastewater phosphorus recovery pretreatment process

A phosphorus recovery and pretreatment technology, applied in the field of pretreatment technology, can solve the problems of water pumps, pipe fittings and other facilities that are prone to scaling and high impurity content in products, and achieve the effect of reducing the content of impurities and reducing the amount of alkali

Active Publication Date: 2014-09-10
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of livestock and poultry breeding wastewater, urban sludge anaerobic supernatant and other waste water phosphorus recovery, a large amount of alkali needs to be added, the product has high impurity content, and water pumps, pipe fittings and other facilities are easy to scale. The invention provides a waste water Phosphorus recovery pretreatment process

Method used

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Examples

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Effect test

Embodiment 1

[0011] A livestock and poultry breeding wastewater, initial pH value 6.0, suspended solids 830 mg / L, carbonate 800 mg / L, NH 4 + and PO 4 3- The concentrations were 340 mg / L and 93 mg / L, respectively. Firstly, the wastewater is pumped into the blowing tank for aeration and blowing, the gas-liquid ratio is controlled at 8:1, and the residence time is 100 min. After the blowing, the pH value rises to 9.0, and 95% of the carbonate is removed. The stripped wastewater flows into the sedimentation tank, and the sedimentation time is 60 minutes to remove more than 90% of the suspended solids and colloids in the wastewater, as well as some inorganic salt precipitation products. The effluent after the sedimentation tank is pumped into the crystallization reaction tank, and a certain amount of MgCl is added 2 , adding 0.2 mg / L NaOH to adjust the pH value to 9.4, and carry out magnesium ammonium phosphate (MgNH 4 PO 4 ·6H 2 O) Crystallization reactions. After the reaction, the mag...

Embodiment 2

[0013] Anaerobic supernatant of municipal sludge, initial pH value 7.0, suspended solids 1200 mg / L, carbonate 500 mg / L, NH 4 + and PO 4 3- The concentrations were 820 mg / L and 150 mg / L, respectively. Firstly, the wastewater is pumped into the stripping tank for aeration and stripping, the gas-liquid ratio is controlled at 6:1, and the residence time is 70 minutes. After stripping, the pH value rises to 8.7, and 97% of the carbonate is removed. The stripped wastewater flows into the sedimentation tank, and the sedimentation time is 120 minutes to remove more than 89% of suspended solids and colloids in the wastewater, as well as some precipitation reaction products. The effluent after the sedimentation tank is pumped into the crystallization reaction tank, and a certain amount of MgCl is added 2 , adding 0.5 mg / L NaOH to adjust the pH value to 9.5, and carry out magnesium ammonium phosphate (MgNH 4 PO 4 ·6H 2 O) Crystallization reactions. After the reaction, the content...

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Abstract

The invention discloses a wastewater phosphorus recovery pretreatment process, belonging to the field of water pollution control and resource recycling. The wastewater phosphorus recovery pretreatment process comprises the following steps: performing CO2 air stripping of the phosphorus-containing wastewater in an air stripping tank (tower); leading the wastewater after air stripping into a sedimentation tank in an automatic-flow mode; removing the suspension organic matters, colloids and some sediments of the wastewater in the sedimentation tank; performing phosphorus recovery of the effluent of the sedimentation tank through magnesium ammonium phosphate or calcium phosphate crystallization reaction. By adopting the wastewater phosphorus recovery pretreatment process disclosed by the invention, the alkali added for phosphorus recovery can be greatly reduced, the content of impurities in the phosphorus recovery product is reduced, and meanwhile, the problem of scaling of facilities such as water pumps, pipe fittings and the like is effectively solved.

Description

technical field [0001] The invention belongs to the field of water pollution control and resource regeneration, and is a pretreatment process for phosphorus recovery of phosphorus-containing wastewater. Background technique [0002] The presence of a large amount of phosphorus in wastewater is one of the main reasons for water eutrophication, which has a serious negative impact on the quality of water environment and has become one of the major environmental problems at present. Phosphorus is an indispensable nutrient element for all life forms, and it is also an important chemical raw material. Especially the limited phosphate rock resources in nature make it necessary to realize the recycling of phosphorus resources. Phosphorus recovery from wastewater is an important way to alleviate water pollution and phosphorus resource shortage. At present, the main process for phosphorus recovery from wastewater such as aquaculture wastewater and urban sludge anaerobic supernatant i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C02F103/20
Inventor 叶志隆陈少华邓玉君叶欣
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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