Process for reclaiming city domestic sludge

Abstract

The invention relates to the technical field of sludge resource technology, in particular to a technology which uses aerobic biological-physical-chemical jointed rapid fermentation technology to treat the urban living sludge resources; municipal sludge, mushroom dregs and green garbage are mixed based on a proper proportion; then an appropriate amount of quicklime is added to the mixture for fermentation through the aerobic biological-physical-chemical jointed technology; the fermentated product is screened and sorted to form the refined organic fertilizer. The technology can make fast treatment to three waste resources including the municipal sludge, the urban green garbage and the mushroom dregs; the technology can also adjust the material proportion of the mixture based on the nutritional characteristics of various gardens and fruit trees, as well as the resource conditions in different areas, so that the obtained organic fertilizer can achieve best effect. The organic fertilizer has full nutrients, good fertilizer efficiency, long fertilizer effect period and high utilization rate, which has the functions of improving the soil activity, resisting drought, saving water, preventing disease and improving crop yield and quality so as to eventually reduce the municipal sewage sludge and realize harmless treatment to the municipal sewage sludge resource.

Description

technical field [0001] The invention relates to the technical field of sludge resource utilization technology, in particular to an aerobic biological-physical-chemical combined rapid fermentation technology for urban domestic sludge resource utilization. Background technique [0002] Sludge refers to the flocculent mud particles produced in the process of urban sewage treatment, that is, the solid components in sewage, which are characterized by high organic matter content, high nitrogen, phosphorus, potassium content, and high moisture content (>80%). Add flocculants to form a colloid, which is extremely difficult to dehydrate and contains a large number of pathogenic bacteria, parasites, organic pollutants and weed seeds. If they are piled up or buried, they will cause serious pollution to the surrounding environment. [0003] At present, the treatment (or disposal) of municipal sludge can be roughly divided into ① landfill, ② thermal drying-incineration, ③ composting-r...

AI Technical Summary

Problems solved by technology

Chinese Patent Publication No. CN1631821 discloses a treatment method for municipal sludge, but ignores the possible secondary air pollution caused by using dewatered sludge as fuel

Chinese Patent Publication No. CN1762863 discloses a sludge drying and recycling process, which involves dehydrating and drying the sludge and then fermenting it, and then granulating it to make granular dry sludge as an organic fertilizer. The disadvantage is that the When the sludge is dried, the microorganisms in the sludge are killed, making it difficult for the fermentation process to proceed smoothly. At the same time, a large number of bacteria need to be added, which increases the processing cost

Chinese Publication Patent No. CN1974492 discloses a method for producing microbial fertilizer by mixing garbage and sludge for secondary fermentation. Its advantage is that the pollution of garbage and sludge to the environment can be solved through fermentation, and at the same time, microbial bacteria with high fertilizer efficiency can be obtained. The disadvantage is that the impact of heavy metals in sludge and garbage on the environment is not considered

[0007] Chinese published patent No. CN1445182 discloses an improved method for treating organic sludge. After the sludge is pretreated chemically and / or physically, the biodegradability of the cells in the sludge is greatly increased. The solid-liquid separation and biodegradation occur simultaneously in the membrane bioreactor, which can significantly improve the sludge efficiency. The disadvantage is that the cost of the membrane bioreactor is relatively high

Chinese Publication Patent No. CN1654437 discloses an alternate aerobic and anaerobic composting reactor for sludge, which uses a self-made composting reactor and an oxygen supply system with automatic temperature control by a single-chip microcomputer, but this treatment method cannot effectively reduce the toxicity of heavy metals in sludge

Chinese Publication Patent No. CN1727292 discloses an integrated method of semi-drying and high-temperature aerobic composting fermentation technology to treat sludge. This method can save energy, has a high degree of automation and low operating costs. The disadvantage is that this method is only a simple treatment. Sludge, does not provide comprehensive treatment of other municipal organic waste

The disadvantage is that it increases the difficulty of mixing compost materials, and the materials used also increase the content of heavy metals in compost

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