MABR-MBR combined type sewage treatment device and treatment method

The technology of a sewage treatment device and treatment method, which is applied in the field of MABR and MBR combined sewage treatment equipment, can solve the problems of high energy consumption, low oxygen utilization rate, and high maintenance cost of the aeration system, so as to save infrastructure costs and reduce volume The effect of low load and operating costs

Inactive Publication Date: 2015-09-16
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, when MBR is used alone, the utilization rate of oxygen is too low, most of the oxygen diffuses into the air through air bubbles, and the energy consumption of the aeration system is high
Only a small amount of oxygen is used by microorganisms. When there is surfactant in the wastewater, it is easy to generate foam, which is not easy to remove. Moreover, due to the increase in the concentration of sludge in the aeration tank, there will often be problems of membrane fouling in the actual operation process. Clean the membrane module, so there will be disadvantages such as short membrane life and high maintenance costs

Method used

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  • MABR-MBR combined type sewage treatment device and treatment method
  • MABR-MBR combined type sewage treatment device and treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] use as figure 2 The MABR-MBR integrated wastewater treatment device with the structure shown is fed into the pretreated domestic sewage. The domestic sewage is the shower wastewater from a bathing center. The water quality indicators are: COD: 140mg / L, NH3-N: 42mg / L, SS: 45mg / L, LAS: 6.2mg / L, MABR membrane module material is polyvinylidene fluoride (PVDF), inner diameter 0.4mm, outer diameter 0.45mm, MBR membrane module material is the same as MABR membrane, pore size is 0.1 um, the membrane flux is 16L / (m 2 h). Firstly, the pretreated water is pumped into the MABR tank by the water inlet pump, and at the same time, aeration is made to the MABR membrane cavity. The water treated by the membrane enters the MBR tank through the diversion wall, and is aerated at the bottom of the tank. The sludge concentration is 4500-5500mg / L, and a sludge discharge pipe is installed at the bottom of the MBR reactor to discharge the remaining sludge regularly. The water quality afte...

Embodiment 2

[0042] The processing device is the same as in Example 1. The influent water adopts pretreated landscape lake water with severe eutrophication, and its water quality indicators are COD: 83mg / L, TP: 0.23mg / L, TN: 13mg / L, NH 3- N: 0.8 mg / L. The operating conditions are basically the same as in Example 1: in the MABR tank, the aeration pressure is about 0.07-0.1MPa, the pH is controlled at 7.5-8.5, and the hydraulic retention time is controlled at 8h; in the MBR tank, the aeration rate is adjusted so that the dissolved oxygen concentration is controlled at 3.5~4.5mg / L, PH at 7.5~8, hydraulic retention time at 6h, sludge concentration at 4000~5000mg / L. At room temperature, after the device runs stably, the effluent indicators are COD: <11mg / L, TP: <0.08mg / L, TN: <2.3mg / L, NH3-N: <0.2mg / L.

Embodiment 3

[0044] The processing device is the same as in Example 1. The influent is pretreated cornstarch wastewater, and its water quality index is COD: 8350mg / L, NH 3- N: 13mg / L, TN: 210mg / L, SS: 2200mg / L, PO 4- : 48mg / L, PH: 3.4. The operating conditions are basically the same as those in Example 1 except for the following: in the MABR pool, the aeration pressure is about 0.07-0.1MPa, the pH is controlled at 7.5-8.5 by adding NaOH, and the hydraulic retention time is controlled at 12h; in the MBR pool, the dissolved oxygen The concentration is controlled at 3.5-4mg / L, the pH is 7.5-8, the hydraulic retention time is controlled at 9h, and the sludge concentration is 6000-9000mg / L. After the device runs stably, its effluent indicators are COD: 4- : <2mg / L, PH: 7.1.

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Abstract

The invention belongs to the technical field of sewage treatment, and discloses an MABR-MBR combined type sewage treatment device. The device comprises a pre-treatment unit, an MABR unit, an MBR unit and a backflushing unit matched with the MBR unit, wherein the four units are arranged along a sewage flowing direction. The invention further discloses a control method thereof. The effect of removing nitrogen and phosphorous is well realized through the sufficient combination of advantages of two membrane reactors. Since the bubbleless aeration is adopted in an MABR pond, the utilization rate of the oxygen is high and nearly can achieve 100%. Since the mass transfer range of the oxygen is small, denitrifying bacteria and denitrifying phosphate-accumulating organism are mainly existent in the water to finish denitrification and phosphorous releasing process of the nitrate, and the performance of removing nitrogen and phosphorous in the next stage is strengthened. After entering an aerobic MBR pond, the aerobic bacteria further remove residual nitrite and ammonia nitrogen, and the aerobic phosphorous-accumulating bacteria finish the phosphorous removal work. Through the previous treatment of the MABR, the volumetric loading of the MBR is reduced.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a combined MABR and MBR sewage treatment device and treatment method. Background technique [0002] Such as figure 1 As shown, the membrane aerated bioreactor (usually abbreviated as MABR) is a type of membrane bioreactor, and the reactor is a kind of hollow fiber membrane cavity 100 filled with hydrophobic air permeability, oxygen and pollutants A concentration difference is formed near the biofilm, with the membrane cavity as the center, and the two diffuse from the inside to the outside and from the outside to the inside respectively. The metabolism of microorganisms in the biofilm consumes dissolved oxygen and degrades organic pollutants in sewage. sewage treatment technology. The process of removing pollutants by the MABR system can be divided into the following four steps: first, the pollutants in the water body react with the anaerobic bacteria in the water flow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 程方刘琪张文丽
Owner TIANJIN CHENGJIAN UNIV
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