A method for immobilized anaerobic ammonium oxidation coupled with short-range denitrification to treat urban sewage and nitrate wastewater

A short-range denitrification and anammox technology is applied in the field of immobilized anammox coupled with short-range denitrification to treat urban sewage and nitrate wastewater, which can solve the problems of unstable system operation and loss, and achieve sludge settling performance. Good, maintain the effect of stable operation

Active Publication Date: 2019-02-15
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of unstable operation of the SBR system of anammox-short-range denitrification treatment of urban sewage and nitrate wastewater caused by the loss of anammox bacteria and the influence of organic matter on anammox activity. Microbial technology prepares anammox gel pellets, traps anammox bacteria in the system and weakens the influence of organic matter on anammox bacteria, and enhances the stability of the system

Method used

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  • A method for immobilized anaerobic ammonium oxidation coupled with short-range denitrification to treat urban sewage and nitrate wastewater
  • A method for immobilized anaerobic ammonium oxidation coupled with short-range denitrification to treat urban sewage and nitrate wastewater

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Embodiment 1

[0029] The preparation of the anaerobic ammox gel beads, the specific process is as follows:

[0030] Select the anammox sludge with a sludge concentration of 9000 mg / L, wash it with deionized water after deoxygenation, and set it aside. Preparation of embedding agent: Prepare 200ml of polyvinyl alcohol (PVA) and sodium alginate (SA) mixed solution ① according to the mass-volume percentage concentration of 15g / L and 2g / L, and heat it at 120°C for 20min to accelerate it. Dissolve; prepare 500ml sodium nitrate (NaNO 3 ) and calcium chloride (CaCl 2 ) mixed fixative ②. Anammox sludge with a concentration of 9000mg / L and the mixed solution ① take 25ml respectively, mix well to obtain the bacteria-glue mixed solution, and then add it dropwise to 250ml mixed fixative solution ② in relative amounts, and fully mix it at room temperature. After contacting for 12 hours, the immobilized beads were immobilized and cross-linked, and then the immobilized beads were washed with deoxygenat...

Embodiment 2

[0032] Using anammox immobilization technology coupled with short-range denitrification to treat urban sewage and nitrate wastewater, the specific process is as follows:

[0033] Such as figure 1As shown, the above-mentioned activated anammox pellets are added to the SBR reactor (5) of anaerobic ammonium oxidation coupling short-range denitrification treatment of urban sewage and nitrate wastewater according to the volume filling rate of 20%, and the reactor is effective Volume 10L; inoculate short-range denitrification sludge with nitrite accumulation rate of 80%-100% in the anammox-short-range denitrification SBR reactor (5), and the sludge concentration after inoculation is 2500-3000mg / L; city The urban sewage in the sewage raw water tank (1) enters the anaerobic waste water through the first water inlet pump (3) and the nitrate waste water in the nitrate waste water tank (2) through the second water inlet pump (4) at a volume ratio of 10:1. Ammonia oxidation-short-range d...

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Abstract

The invention relates to a method for treating municipal sewage and nitrate wastewater by immobilized anaerobic ammoxidation coupled short-range denitrification, belonging to the technical field of sewage treatment. Polyvinyl alcohol and sodium alginate are used as embedding materials to perform anaerobic ammoxidation cell immobilization, and the prepared anaerobic ammoxidation gel pills are used in an SBR (sequencing batch reactor) system for treating municipal sewage and nitrate wastewater by anaerobic ammoxidation-short-range denitrification. The process unit comprises a municipal sewage raw water tank, a nitrate wastewater tank and an anaerobic ammoxidation-short-range denitrification SBR reactor. The immobilized microbe technique is utilized to solve the problems of high loss tendency, unstable systems operation and the like caused by poor settleability of the anaerobic ammoxidation bacteria. The immobilized anaerobic ammoxidation gel pills and short-range denitrification sludge coexist in the SBR system; and since the mass transfer between organic substances and toxic substances is hindered, the anaerobic ammoxidation bacteria in the immobilized pills can not be easily inhibited, thereby enhancing the treatment process stability of the system.

Description

technical field [0001] The invention relates to a method for immobilized anaerobic ammonium oxidation coupling short-range denitrification to treat urban sewage and nitrate wastewater, belonging to the technical field of sewage treatment. The specific content is to use immobilized microbial technology to immobilize highly active anammox bacteria in gel beads. The denitrification sludge is co-inoculated in the same SBR reactor, and urban sewage and nitrate wastewater enter the reactor in a certain proportion. The ammonia nitrogen is converted into nitrogen gas through the anaerobic ammonium oxidation process, realizing the simultaneous removal of ammonia nitrogen and nitrate. Background technique [0002] Due to the acceleration of my country's industrial process, the discharge of a large amount of wastewater containing nitrogen and phosphorus without strict treatment has caused eutrophication of water bodies to occur continuously, and the water environment has been severely...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F3/34C02F101/16
CPCC02F3/28C02F3/341C02F2101/16C02F2203/006
Inventor 王淑莹韩金浩贾方旭张向晖彭永臻王众
Owner BEIJING UNIV OF TECH
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