Method for strengthening biological phosphorus removal of sewage and recycling phosphate resources from sewage

A sewage biological and phosphate technology, applied in chemical instruments and methods, phosphorus compounds, water/sewage treatment, etc., can solve the problems of difficult precipitation of chemical sediments and unfavorable phosphorus recovery, etc., to reduce the burden of biological treatment, convenient and efficient Effect of recycling and enhancing activity

Inactive Publication Date: 2017-04-19
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] When chemical phosphorus removal is carried out in the sludge treatment process, due to the high concentration of suspended matter and organic matter in the sludge water, the chemical precipitation of phosphate is not easy to precipitate, which is not conducive to the recovery of phosphorus.

Method used

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  • Method for strengthening biological phosphorus removal of sewage and recycling phosphate resources from sewage
  • Method for strengthening biological phosphorus removal of sewage and recycling phosphate resources from sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Based on inverted A 2 O system phosphorus removal recovery method (see figure 1 ):

[0057] 1) Feed domestic sewage raw water, a mixed solution containing 150% of the influent domestic sewage from the aerobic tank with a high concentration of nitrate, and the sludge returned from the secondary sedimentation tank into the anoxic tank In the process, after denitrification and denitrification, it is introduced into the anaerobic pool and stayed in the pool for 0.5 hours;

[0058] 2) After releasing phosphorus in the anaerobic tank, discharge 5% of the anaerobic tank mixed solution that has undergone sufficient anaerobic phosphorus release into the intermediate sedimentation tank; the remaining 95% of the mixed solution enters A 2 Purification treatment is carried out in the aerobic pool of the O system;

[0059] 3) The hydraulic retention time of the mixed solution in the intermediate sedimentation tank is 1h, and the mud and water are separated;

[0060] 4) 100% of th...

Embodiment 2

[0068] Phosphorus removal recovery method based on oxidation ditch system (see figure 2 ):

[0069] 1) Pass the domestic sewage raw water and the sludge from the intermediate sedimentation tank and the secondary sedimentation tank (equivalent to 100% of the raw water inflow of the system) into the anaerobic tank and stay in the middle pool for 1 hour;

[0070] 2) After releasing phosphorus in the anaerobic tank, discharge 30% of the anaerobic tank mixed solution that has undergone sufficient anaerobic phosphorus release into the intermediate sedimentation tank; the remaining 70% of the mixed solution enters the oxidation ditch of the oxidation ditch system for purification treatment ;

[0071] 3) The hydraulic retention time of the mixed solution in the intermediate sedimentation tank is 2h, and the mud and water are separated;

[0072] 4) 100% of the sludge settled in the intermediate sedimentation tank is discharged synchronously according to the inflow speed, and enters ...

Embodiment 3

[0080] Based on traditional A 2 O system phosphorus removal recovery method:

[0081] 1) Feed the raw domestic sewage, the high-concentration nitrate mixture from the aerobic tank equivalent to 300% of the influent domestic sewage, and the sludge returned from the secondary sedimentation tank into the anoxic tank , after denitrification and denitrification, introduce into the anaerobic tank and stay for 1 hour;

[0082] 2) After the anaerobic tank releases phosphorus, 15% of the anaerobic tank mixed solution that has undergone sufficient anaerobic phosphorus release is discharged into the intermediate sedimentation tank; the remaining 85% of the mixed solution enters the A 2 Purification treatment is carried out in the aerobic pool of the O system;

[0083] 3) The hydraulic retention time of the mixed solution in the intermediate sedimentation tank is 1.5h, and the mud and water are separated;

[0084] 4) 100% of the sludge settled in the intermediate sedimentation tank is ...

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Abstract

The invention discloses a method for strengthening biological phosphorus removal of sewage and recycling phosphate resources from sewage. The method is characterized in that mixed liquor containing phosphate with relatively high concentration at an anaerobic stage of a primary flow system is introduced into an intermediate sedimentation tank of a side flow system to carry out mud-water separation based on an inverted and conventional A2O system and an oxidation ditch system; then, liquid supernatant of the intermediate sedimentation tank is introduced into a chemical phosphorous removal reaction tank; ferric salt or aluminum salt is added into the reaction tank, so that phosphate reacts with iron ions or aluminum ions to form insoluble phosphate; and insoluble phosphate precipitates in a chemical precipitation tank are recycled, and liquid supernatant of the chemical precipitation tank is exhausted into an aerobic tank; and sludge of the intermediate sedimentation tank is separately exhausted into a sludge treatment tank, a follow-up aerobic tank or is returned to an anoxic tank according to an operation condition of the system; and part of phosphate in sewage on an anaerobic phase in the primary flow system is chemically recycled at side flow, so that burden of biological phosphorus removal of the primary flow system is relieved, biological phosphorus removal is facilitated, and phosphate resources in sewage are recycled.

Description

technical field [0001] The invention belongs to a novel method for biologically purifying sewage and recovering phosphate resources therein, in particular to a method for strengthening biological dephosphorization of sewage and recovering phosphate resources in sewage. Background technique [0002] The discharge of phosphate in sewage is a key factor that causes eutrophication in lakes, reservoirs and bays. Therefore, my country's sewage discharge standards have made strict regulations on the concentration of phosphate. my country's "Urban Wastewater Treatment Plant Pollutant Discharge Standard" (GB18918-2002) stipulates that since January 1, 2006, the effluent of newly built urban sewage treatment plants must meet the first-class A discharge standard, that is, the total phosphorus should not exceed 0.5mg / L. [0003] The phosphate in sewage comes from various cleaning agents in daily life, human excrement, or the loss of phosphate fertilizer in farmland and the discharge of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C01B25/37C01B25/36
CPCC01B25/36C01B25/375C02F3/308C02F9/00C02F2301/08C02F1/52C02F1/58
Inventor 袁林江
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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