Method for comprehensively utilizing sludge in recycling mode

Abstract

The invention discloses a method for comprehensively utilizing sludge in a recycling mode. The method comprises the following steps: dewatering sludge of a municipal wastewater treatment plant; respectively analyzing and detecting dewatered sludge, food residues, domestic garbage and human and animal excreta, and deodorizing simultaneously; sorting the deodorized sludge, food residues and domestic garbage; mixing the sludge, the food residues, the domestic garbage, the human and animal excreta, crop straws with reused fluffy sludge in a certain ration at 5-6MPa; meanwhile, controlling stirring temperature to 40-45DEG C until the moisture content of the mixture is 55-65wt%; carrying out aerobic fermentation on the mixture in a fermentation tank for 6-7 days to obtain the fluffy sludge; andcarrying out aftertreatment on the fluffy sludge to obtain fertilizer or fuel. The method has the effects of high fermentation degree, high fermentation speed and the like and is environmentally friendly, and the fertilizer or fuel obtained by aftertreatment can be used for improving soil or saving energy.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for comprehensive utilization of sludge resources. Background technique [0002] In recent years, with the rapid development of my country's economic construction and the enhancement of people's awareness of environmental protection, the country has formulated stricter and feasible standards for sewage discharge, and built various types and scales of sewage treatment plants. The problem is how to provide for these sewage plants. Separation of matter—sludge looking for a way out. [0003] In our country, due to economic and technical reasons, there is no stable and reasonable outlet for sludge at present. Some data show that about 90% of the built sewage treatment plants do not have supporting facilities for sludge treatment, and more than 60% of the sludge is directly used for agriculture without any treatment, and the digested sludge is also due to the lac...

AI Technical Summary

Problems solved by technology

However, because the sludge contains a large number of toxic and harmful substances that are difficult to degrade, such as pathogenic bacteria, parasites, non-ferrous metals, and organic pollutants, the abuse of sludge without stabilization and harmless treatment may cause secondary pollution of the soil, and then pass through the food chain. Harmful to human health

[0006] (2) Landfill needs to find a suitable site, and these sites are often not suitable for finding. At the same time, harmful components in the sludge will leak into the groundwater and cause pollution. At the same time, the sanitation and odor problems of the landfill often cause secondary pollution. Pollution

Therefore, landfilling does not ultimately eliminate pollution, but only delays it.

[0007] (3) The entry of harmful components in the sludge into the sea will definitely harm the marine ecosystem, threaten the human food chain, and cause environmental pollution on a global scale

[0008] ⑷ The direct incineration of sludge requires high costs; fly ash, slag and flue gas are produced during the incineration process

However, the total fermentation period of this method is more than two months.