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High-load metabolic regulation bioreactor and method for waste-water treatment

The invention relates to a bioreactor and a technology of metabolic regulation, which is applied to a high-load metabolic regulation bioreactor and the field of wastewater treatment by using the reactor, and can solve the problems of increased operating cost, high energy consumption and operating cost, and high energy consumption of effluent reflux. Achieve the effect of saving startup cost, low startup cost and fast startup speed

Inactive Publication Date: 2015-11-18
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, the thermal incineration process requires a large investment in infrastructure, consumes a large amount of fuel gas or fuel oil, and has high energy consumption and operating costs. Moreover, when this process is used to treat wastewater containing acrylate, it is easy to cause corrosion of the furnace body, blockage of pipes, furnace bricks, etc. Requires periodic replacement, further increasing operating costs
Acrylic acid is a biodegradable organic substance, but due to the high toxicity of acrylic acid (salt), the biological treatment process usually requires a large amount of dilution of acrylic acid (salt) wastewater with domestic sewage, cooling water, etc. The disadvantage is that a large amount of cooling water is wasted due to the dilution of wastewater, and the energy consumption of effluent backflow is high.
Moreover, because acrylic acid (salt) is highly toxic to water treatment microorganisms, especially methanogens, and it is difficult to domesticate sludge, it often takes half a year or even more than a year to start the reactor, and is easily impacted by shock loads, which seriously affects the normal operation of production equipment. Wait

Method used

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  • High-load metabolic regulation bioreactor and method for waste-water treatment

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Effect test

Embodiment 1

[0063]Wastewater A COD21000mg / L, containing acrylic acid 15000mg / L, waste water B COD55000mg / L, containing sodium acrylate 52000mg / L, the water volume ratio of waste water A and waste water B is 3:1, according to the method of the present invention, the reflux ratio of the treated effluent is 1.125 . After mixing, the waste water does not add acid and alkali to adjust the pH, but adds nutrients such as nitrogen and phosphorus, and enters the high-load metabolic regulation bioreactor of the present invention for pretreatment. The HRT is 6h, and the inhibition rate of anaerobic methanogenesis of the waste water is reduced to 8%. , The BOD5 removal rate is 13%; then the effluent is supplemented with iron, cobalt, nickel trace elements and then treated with the EGSB reactor. The HRT is 24h, and the COD removal rate is above 90%; , the effluent does not contain acrylic acid or acrylate, and the COD drops below 120mg / L.

Embodiment 2

[0065] A certain waste water COD50000mg / L, containing acrylic acid 15000mg / L, sodium acrylate 13000mg / L, sodium acetate 20000mg / L, according to the method of the present invention, after adding nutrients such as nitrogen and phosphorus to adjust the pH of the waste water, it enters the high-load metabolism of the present invention. Regulate the bioreactor for pretreatment, HRT is 3.5h, the treatment load can reach 171kg / m3.d (calculated as acrylic acid), the inhibition rate of anaerobic methanogenesis of wastewater is reduced to 7%, and the removal rate of BOD5 is 10%; then the effluent is supplemented Iron, cobalt, and nickel trace elements are treated by EGSB reactor, the total HRT is 30h, and the COD removal rate is over 95%; the effluent of EGSB reactor is then treated by biological fluidized bed reactor, HRT=20h, and the effluent does not contain acrylic acid Or acrylate, COD dropped below 120mg / L.

Embodiment 3

[0067] A certain waste water COD42000mg / L, containing acrylic acid 15000mg / L, acetic acid 20000mg / L, according to the method of the present invention, after adding nutrients such as nitrogen and phosphorus to adjust the pH of the waste water, enter the high-load metabolic regulation bioreactor of the present invention for pretreatment , HRT is 3h, the treatment load can reach 120kg / m3.d (calculated as acrylic acid), the inhibition rate of anaerobic methanogenesis of wastewater is reduced to 8%, and the removal rate of BOD5 is 12%; then the effluent is supplemented with trace elements such as iron, cobalt and nickel EGSB reactor is used for treatment, HRT is 36h, COD removal rate is above 95%; EGSB reactor effluent is treated with biological fluidized bed reactor, HRT=20h, effluent does not contain acrylic acid or acrylate, COD is reduced to 120mg / Below L.

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Abstract

The invention discloses a high-load metabolic regulation bioreactor and a method for adopting the same to carry out waste-water treatment. The high-load metabolic regulation bioreactor comprises a double-layer barrel-shaped separator (4), a circular isolating barrel (7) and an aeration head (6), wherein the high-load metabolic regulation bioreactor is partitioned into a reaction area and a precipitation area (1) which are connected by a sludge returning gap (8); the circular isolating barrel (7) is vertically arranged in the reaction area; the aeration head (6) is arranged at the bottom part of the circular isolating barrel (7). The method comprises the steps of: mixing of waste water, pretreatment of waste water, anaerobic methanization treatment and aerobic biological treatment. The device and method adopted for treating the waste water containing acrylic acid and the waste water containing acrylate have the advantages of fast starting speed, high treatment load, stable operation and low treatment cost.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a high-load metabolic regulation bioreactor and a wastewater treatment method using the reactor. Background technique [0002] During the production process of acrylic acid and the production process using acrylic acid as raw material, a large amount of waste water containing relatively high concentration of acrylic acid or acrylate will be produced. Due to the high toxicity of acrylic acid and its salts to microorganisms, direct biochemical treatment often has problems such as slow sludge acclimation, easy sludge loss, and unstable water quality. [0003] At present, wastewater containing acrylic acid is mostly treated by thermal incineration and other processes. The thermal incineration process is to concentrate the waste water containing high concentration of acrylic acid through the stripping tower, and spray it into the waste water incinerator in the form of mist with th...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F9/14
CPCY02W10/10
Inventor 周岳溪宋玉栋
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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