Comprehensive utilization method and comprehensive utilization system for biochemical sludge

Abstract

The invention discloses a comprehensive utilization method and a comprehensive utilization system for biochemical sludge. The method comprises the following processing steps: step (1) of centrifuging the biochemical sludge, rotating and drying in a rotary drier to obtain the dry sludge, wherein a drying medium is boiler exhaust gas; step (2) of grinding the dry sludge as boiler fuels or mixing the dry sludge with thermal coals as the boiler fuels; taking the boiler exhaust gas generated by burning as the drying medium in the step (1); step (3) of directly burning the dry sludge or burning the dry sludge with the thermal coals to generate ashes, filtering the ashes after melting with alkalis or water; adding acids in filtrate to precipitate, filtering to obtain precipitates and secondary filtrate; washing, drying and burning the precipitates to obtain white carbon blacks; adding the alkalis in the secondary filtrate to precipitate, filtering and collecting the precipitates, washing, drying and burning the precipitates to obtain iron oxide reds. The method can effectively process the sludge and reasonably utilize generated heats and products, so that the method has the advantages of good processing effects, energy conservation and environment protection.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource recycling, in particular to a biochemical sludge comprehensive utilization method and a comprehensive utilization system. Background technique [0002] With the continuous development of social economy, the chemical industry (coal chemical industry, petrochemical industry), printing and dyeing paper industry, and urban life produce more and more sewage. While treating these sewage, a large amount of biochemical sludge is produced. Establish a A sludge resource utilization method with good treatment effect, low investment cost, stable operation, advanced technology, energy saving and environmental protection, environmental benefits, social benefits, and economic benefits, which meets the requirements of harmless sludge treatment and resource utilization. It is a major technical problem in energy saving, environmental protection and various industrial production fields....

AI Technical Summary

Problems solved by technology

The problem of sludge agricultural use and landfill or stacking is that it occupies a large area, and the transportation cost is high. The heavy metals and toxic substances contained in the sludge will accumulate in the soil and pollute the groundwater. It has been reported that sludge filling Some herbivores died due to the accumulation of poison near the burial site

After the sludge is incinerated, the volume is greatly reduced, which can solve the shortcomings of landfill storage, but the problems of secondary pollution of flue gas and heat loss in the process have not been well solved.

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