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Wastewater Phosphorus Recovery Pretreatment Process

A phosphorus recovery and pre-treatment technology, applied in the field of pre-treatment technology, can solve the problems of easy scaling of water pumps, pipe fittings and other facilities 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: 2016-04-06
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • 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

Experimental program
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Effect test

Embodiment 1

[0011] A livestock and poultry breeding wastewater, initial pH value 6.0, suspended solids 830mg / L, carbonate 800mg / L, NH 4 + and PO 4 3- The concentrations were 340mg / L and 93mg / L respectively. Firstly, the waste water is pumped into the blow-off tank for aeration and blow-off, the gas-liquid ratio is controlled at 8:1, and the residence time is 100 minutes. After the blow-off, the pH value rises to 9.0, and 95% of the carbonate is removed. The blown-off 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 , add 0.2mg / L NaOH to adjust the pH value to 9.4, carry out magnesium ammonium phosphate (MgNH 4 PO 4 ·6H 2 O) Crystallization reactions. After the reaction, the magnesi...

Embodiment 2

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

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Abstract

A pretreatment process for wastewater phosphorus recovery, belonging to the field of water pollution control and resource regeneration, which includes the following steps: firstly, phosphorus-containing wastewater is stripped with CO2 in a stripping tank (tower); the stripped wastewater enters the sedimentation in a self-flowing form The wastewater is removed in the sedimentation tank for suspended organic matter, colloids and part of the precipitated products; the effluent of the sedimentation tank is then reclaimed phosphorus through ammonium magnesium phosphate or calcium phosphate crystallization reaction. The pretreatment process for wastewater phosphorus recovery provided by the present invention can greatly reduce the amount of alkali added during phosphorus recovery, reduce the content of impurities in phosphorus recovery products, and effectively solve the problem of fouling of facilities such as water pumps and pipe fittings.

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 Patents(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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