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Enhanced wastewater phosphorus removal method

A technology for sewage and sludge, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve the problems of difficulty in recycling phosphorus resources, poor phosphorus removal effect, etc., and achieve increased links and treatment costs. , save costs, and achieve the effect of recycling

Inactive Publication Date: 2015-07-08
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to propose a stepwise enhanced phosphorus removal method for sewage in view of technical problems such as poor phosphorus removal effect and difficulty in phosphorus resource recovery in the existing sewage biological phosphorus removal technology

Method used

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Effect test

Embodiment 1

[0047] Take A 2 / O is 5L of activated sludge in the secondary sedimentation tank of a sewage treatment plant that is the main treatment process. The sludge is placed for 1 day by gravity concentration, and the total phosphorus concentration is determined to be 700mg / L. Take 1L of this concentrated sludge and place it in an anaerobic reactor, and add 50 g of blue-ironite crystals at the bottom of the reactor, with an average particle size of 4 mm. Set the temperature of anaerobic digestion to 35°C, the rising velocity of sludge to 0.05m / s, add 42.4mmol of amorphous FeOOH, react for 21 days, and monitor the changes of soluble phosphate in the sludge digestion system. The results showed that compared with the final dissolved phosphorus concentration of 240mg / L in the control experiment, the final phosphorus concentration of the anaerobic digestion system with FeOOH was 80mg / L, and the phosphorus concentration was reduced by 67%.

Embodiment 2

[0049] A 2 / O is the activated sludge in the secondary sedimentation tank of the sewage treatment plant in the main treatment process. After gravity concentration for 1 day, the total phosphorus concentration of the sludge is 610-750mg / L. The concentrated sludge was added to a CSTR reactor with an effective volume of 1L containing 10g blue-ironite seeds (average particle size 3mm) as the experimental material, and amorphous FeOOH was added at the same time according to the Fe / sludge TP molar ratio of 2.0 , set the temperature of anaerobic digestion to 55°C, and the sludge rising velocity to 0.05m / s, and run for 108 days in total. It has been confirmed by testing that after a period of operation, the crystal size of blue-ironite in the mud phase of the digester increases, and no other associated minerals are formed, and the phase is single, such as figure 2 , image 3 shown.

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Abstract

The invention discloses an enhanced wastewater phosphorus removal method applicable to biological treatment process of wastewater, and belongs to the technical field of wastewater depth treatment. The method includes removal and recycling of phosphorus in sludge mixed solution in sludge anaerobic tank through crystallization of blue-iron stone (Fe3(PO4)2.H2O); and removal of phosphorus in wastewater in an aerobic biological reaction tank through the flocculation precipitation of ferric iron. The method employs crystallization of blue-iron stone as the main process for phosphorus removal, adopts a of biological and chemical combined method for phosphorus removal, has high phosphorus removal efficiency, does not produce chemical sludge, and can realize the recycling of phosphorus resource in sewage and save the operation cost of the sewage treatment. The method is an environmentally friendly novel technology for wastewater phosphorus removal.

Description

technical field [0001] The invention belongs to the technical field of sewage advanced treatment technology, and specifically relates to a method for treating sewage by utilizing microbial action and chemical reaction, in particular to a method for removing phosphorus through anaerobic and aerobic biological treatment and chemical crystallization, and realizing recovery of phosphorus resources and Sewage treatment methods for excess sludge reduction. Background technique [0002] With the growth of urban sewage treatment volume and the improvement of treatment efficiency, the amount of residual sludge as a by-product of sewage treatment is also increasing day by day. Traditional sludge reduction and treatment methods have certain limitations in terms of technology and environmental safety. For the various sludge reduction technologies currently used at home and abroad, a problem that is difficult to solve is: when the sludge reduction effect is good and the output of the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F3/30C02F11/00
Inventor 程翔陈兵孙德智刘佳琪
Owner BEIJING FORESTRY UNIVERSITY
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