A carbon-reducing sewage biological treatment method and its sludge to prepare a carbon-fixing soil amendment
A technology for biological sewage treatment and soil conditioner, applied in microbial treatment, sustainable biological treatment, sewage/sludge fertilizer, etc. It can solve the problems of greenhouse gas emission, aggravate greenhouse effect, greenhouse effect, etc., and reduce mineralization. , the effect of improving soil index and improving soil fertility
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[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 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 inoculum ...
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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