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Carbon dioxide emission reduction sewage treatment method for preparing soil conditioner by coupling carbon sequestration of activated sludge and biomass with high conversion amount of carbon source

A technology of soil improver and activated sludge, which is applied in the direction of sewage/sludge fertilizer, biological water/sewage treatment, water/sludge/sewage treatment, etc., and can solve the problems of increasing greenhouse effect, greenhouse gas emission, and greenhouse effect , to achieve the effect of improving soil index, reducing mineralization and improving soil fertility

Active Publication Date: 2021-11-12
SHENZHEN RES INST OF NANKAI UNIV
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Problems solved by technology

The sewage treated by urban sewage plants contains a large amount of organic matter. According to the quantitative relationship of microbial metabolic activities proposed by American sewage biological treatment expert McKinney: under the action of activated sludge microorganisms, 1 / 3 of the soluble organic matter is passed by microorganisms. Dissimilation decomposition, aerobic process produces CO 2 Causes a large amount of greenhouse gas emissions, causing the greenhouse effect
Through endogenous respiration, 80% of the cell matter is decomposed into inorganic matter, and 20% is undecomposable residue. If the water purification function is realized according to the traditional activated sludge method, 86.67% of the soluble organic matter will be converted It is an inorganic substance, causing serious carbon emissions and exacerbating the greenhouse effect

Method used

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  • Carbon dioxide emission reduction sewage treatment method for preparing soil conditioner by coupling carbon sequestration of activated sludge and biomass with high conversion amount of carbon source
  • Carbon dioxide emission reduction sewage treatment method for preparing soil conditioner by coupling carbon sequestration of activated sludge and biomass with high conversion amount of carbon source
  • Carbon dioxide emission reduction sewage treatment method for preparing soil conditioner by coupling carbon sequestration of activated sludge and biomass with high conversion amount of carbon source

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preparation example Construction

[0067] The present invention also provides a preparation method of the above-mentioned soil conditioner, comprising the following steps: dehydrating the above-mentioned activated sludge to a water content of 60-85%, mixing it with dried and pulverized biomass at a volume ratio of 1:3-3:1, The humic agent is inoculated, aerobically fermented for 30-40 days, and dried to obtain the soil conditioner.

[0068] In the present invention, it is preferable to dehydrate the above-mentioned activated sludge, reduce the water content of the sludge to 60-85%, dry, grind (150 microns, 100 mesh) and put it in a sealed bag for later use. The biomass in the present invention preferably includes agricultural biomass, forestry biomass, urban greening biomass and other biomass wastes. In the present invention, the biomass wastes are preferably washed, dried, and crushed into small pieces, or directly crushed into small particles (0.5 cm, approximately equal to 4 meshes) for use.

[0069]The ino...

Embodiment 1

[0074] use figure 1 The shown process carries out the preparation of activated sludge and soil conditioner;

[0075] Carbon fixation bioreactor test: The influent water is sewage from a sewage treatment plant that has passed through the grid and the liquefaction reaction tank. The insoluble suspended matter has been removed from the sewage used, and all organic matter in the sewage has been converted into soluble organic matter. The COD content in the sewage is 312mg / L.

[0076] The C / N of sewage is adjusted to 4.5 / 1 by adding ammonium chloride. The sewage is used to cultivate and domesticate the activated sludge in the first carbon fixation biological reaction tank with a volume of 25cm*30cm*20cm. The activated sludge comes from the aerobic tank of the sewage plant. After being concentrated by sedimentation, high-concentration activated sludge is extracted. The initial activated sludge concentration (MLSS) is 5614mg / L, the dissolved oxygen is adjusted to 1.1±0.05mg / L, and t...

Embodiment 2

[0088] A total of 5 groups of experiments were set up according to different ratios of activated sludge and biomass, and the same amount of microbial agent (10 g) was added to each group of experiments. The specific ratios are shown in Table 2. Put the mixed sample evenly into a ventilated strip frame (35×45×55cm), adjust the moisture content to about 65%, and carry out aerobic fermentation. A layer of insulation cotton is pasted outside the frame to prevent Excessive loss of heat in the medium affects the fermentation process. Put a small aerator (ACO-9601 / 02) into the plate frame to enhance ventilation. Forced ventilation every 3 days, turning the pile manually every 7 days, and replenishing appropriate water, and taking multi-point sampling every 7 days or so and mixing evenly, each sampling 500g, measuring relevant indicators, using the method of first sampling and then turning the pile way, the composting time is 41d.

[0089] Table 2 Experimental design of composting w...

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Abstract

The invention provides a carbon dioxide emission reduction sewage treatment method for preparing a soil conditioner by coupling carbon sequestration of activated sludge and biomass with high conversion of a carbon source, and relates to the technical field of sewage treatment and carbon sequestration emission reduction. The invention provides a novel sewage treatment method capable of reducing emission, slightly discharging CO2 and proliferating activated sludge carbon sequestration at the same time. Meanwhile, biomass and activated sludge generated in the process are coupled and humified to generate humic acid to prepare the soil conditioner, and the effects of carbon sequestration in the sewage treatment process and long-term carbon storage in the soil are achieved. The soil conditioner has an ecological restoration effect on multiple types of to-be-restored soil such as urban landscaping soil, ecological restoration, sandy soil and saline-alkali soil, is good in restoration capability, and can store carbon in the restored soil for a long time, so that the carbon storage time is prolonged.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and carbon sequestration and emission reduction, and specifically relates to a sewage treatment method for carbon dioxide emission reduction, which converts a high amount of carbon source into activated sludge and biomass to couple carbon sequestration to prepare a soil conditioner. Background technique [0002] With the progress of society, the contradiction between economic and social development and ecological and environmental problems has become increasingly prominent. How to reduce carbon emissions and increase the amount of carbon fixed in the carbon cycle in production and life is of great significance to environmental governance. The sewage treated by urban sewage plants contains a large amount of organic matter. According to the quantitative relationship of microbial metabolic activities proposed by American sewage biological treatment expert McKinney: under the action of activat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C05F17/20C05G3/80C02F101/30C02F101/38C02F101/34
CPCC02F3/12C05F7/00C05F17/20C05G3/80C02F2101/30C02F2101/34C02F2101/38C05F11/00Y02W10/10Y02W30/40
Inventor 于晗于宏兵韩佳伟刘小红
Owner SHENZHEN RES INST OF NANKAI UNIV
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