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Method and device for treating sewage and producing biogas

A sewage treatment method and sewage treatment technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, sludge treatment, etc., can solve the problem of large excess sludge production, low anaerobic decomposition rate, and blower consumption and other problems, to achieve the effect of less excess sludge generation, high treatment efficiency, and reduced energy consumption

Inactive Publication Date: 2015-07-22
TIANJIN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Although this method can treat pollutants and realize the discharge of treated sewage up to the standard, it has the problems of high energy consumption, large residual sludge output and difficult treatment.
On the one hand, the main energy consumption of typical sewage treatment methods comes from the aerobic treatment of organic pollutants in sewage. In order to completely oxidize organic matter into carbon dioxide, it is necessary to carry out blast aeration to provide sufficient oxygen for microorganisms, so the blower consumes a large amount of electric energy
On the other hand, the main components of the remaining sludge produced in the sewage treatment process are aerobic microbial cells, the encapsulation of the cell wall and the anaerobic decomposition rate of the microbial extracellular matter are low, and the fermentation speed is slow
Therefore, the use of excess sludge for anaerobic fermentation to produce biogas has the problems of long fermentation time and low biogas yield.

Method used

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  • Method and device for treating sewage and producing biogas

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Effect test

Embodiment 1

[0025] The treatment object of this embodiment is urban domestic sewage containing suspended and colloidal organic matter. Sewage is pretreated by grilles, grit chambers, primary sedimentation tanks, etc. to remove inorganic impurities and then enters such as figure 1 Processing system shown.

[0026]After including the biological treatment system treatment 9 of aerobic treatment, the aerobic residual sludge 9 obtained in the effluent sedimentation tank 6 after the anaerobic-aerobic-anoxic-aerobic treatment passes through the sludge aeration conditioning tank 10 ( After air 11) conditioning, the regenerated sludge 12 flows to the adsorption sedimentation tank 2, and is fully mixed with the incoming treated sewage raw water 1. Through the physical adsorption and biological adsorption of activated sludge, it is quickly adsorbed and suspended in the sewage. and organic matter in a colloidal state; after the adsorption is sufficient, the adsorption sludge 13 and the supernatant 3...

Embodiment 2

[0028] The treatment object of this embodiment is the city sewage that contains the suspended state of lower concentration, colloidal state organic matter, and flow process is basically the same as embodiment 1, and difference is that the settling tank 6 volume of design is larger, and the mud-water mixture after sewage biological treatment 5 The residence time in the sedimentation tank 6 is longer, and the implementation process is omitted figure 1 The aeration regulating tank 10 in.

[0029] The specific process is as follows: the sewage enters the system of the present invention after being pretreated by grilles, grit chambers, primary sedimentation ponds, etc. to remove inorganic impurities. Sewage raw water 1 flows into adsorption settling tank 2. At the same time, aerobic excess sludge 9 is directly sent from settling tank 6 to adsorption settling tank 2. After mixing and settling with incoming sewage raw water 1, the supernatant enters sewage biological treatment purifi...

Embodiment 3

[0031] The treatment object of this embodiment is the industrial sewage containing higher concentration of suspended state and colloidal organic matter. The mud-water mixture stays in the adsorption sedimentation tank 2 for a long time, and the implementation process is omitted figure 1 The sludge thickening tank 14 in. The sludge 13 adsorbed with a large amount of organic matter separated from the adsorption settling tank 2 directly enters the anaerobic fermentation biogas production device 17 for anaerobic fermentation. In the aeration conditioning tank 10, the dissolved oxygen in the sludge is controlled between 4 mg / l, and the aeration is performed for 15 minutes. Through the treatment of the system of this embodiment, compared with the traditional process, the aeration power consumption of aerobic treatment is saved by 55%, the residence time of biogas fermentation is shortened by 6 days, the amount of biogas produced is increased by 40%, and the amount of sludge produce...

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Abstract

The invention relates to a method and device for treating sewage and producing biogas. The method comprises the following steps: mixing biological sludge discharged from a sewage microorganism treatment purification system of an aerobic treatment unit with raw sewage as a treated object, and carrying out adsorption and sedimentation; feeding the supernate obtained in adsorption and sedimentation process into the sewage microorganism treatment purification system for biological treatment of the sewage; feeding the sludge obtained after the adsorption and sedimentation process into a sludge anaerobic fermentation biogas production system for producing the sludge anaerobic fermentation biogas. The biological sludge discharged from the sewage microorganism treatment purification system is adsorbed, deposited and separated from the raw sewage, and granular organic pollutants in the raw sewage and a part of soluble pollutants are absorbed into the sludge for anaerobic fermentation to prepare the biogas, so that the yield and the speed in anaerobic biogas production are increased, the load of sewage purification is alleviated, the aeration amount and the residual sludge yield are reduced, the treatment efficiency is high, and the efficiency of recycling biomass is also high.

Description

technical field [0001] The invention relates to a method and device for treating sewage and producing biogas, in particular, utilizing the adsorption and sedimentation effect of the mixing of activated sludge and sewage to realize the separation of suspended and colloidal organic matter in sewage from other soluble pollutants, and to improve the adsorption The invention relates to a method for recovering biogas by anaerobic fermentation of sludge with a large amount of organic matter, and a method for continuing biological treatment of the separated supernatant, which belongs to the field of water treatment technology and environmental protection. Background technique [0002] With the increasing emphasis on water resources protection in our country, the country vigorously promotes and develops sewage treatment. The typical sewage treatment method represented by urban sewage is as follows: the sewage enters the sewage treatment system through the grid to remove the larger in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/04
CPCY02E50/30Y02W10/20
Inventor 张书廷戴嘉敏方金兴
Owner TIANJIN UNIV
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