Method for separating inorganic/organic components from sludge

Abstract

The invention discloses a method for separating inorganic / organic components from sludge. The method comprises the following three steps of: sludge conditioning, acid liquor extraction and neutralization treatment. Firstly, through sludge conditioning and sterilization treatment, extracellular polymeric substances are destroyed, cell wall breaking is performed, sludge desanding and sludge dewatering properties are improved, and sufficient extraction of inorganic salt from acid liquor is also facilitated; then, through acid liquor extraction, precipitates, namely soluble calcium salt, iron salt, aluminum salt, heavy metal, phosphate and the like, generated by chemical agents adhered to the sludge are dissolved out and separated, and the sludge is further conditioned. Therefore, the separation of organic matters and inorganic minerals in the sludge is greatly improved, and mechanical separation is easy to achieve through adoption of a physical method by utilizing specific gravity difference. Separated organic components can be used for fuel, sewage plant carbon source reuse and the like, and inorganic minerals can be used for soil remediation materials, building materials and the like. The method can be used for sludge treatment of a sewage treatment plant, sludge treatment for cleaning bottom mud in water environment treatment and ditch cleaning in a pipe network and the like.

Description

technical field [0001] The invention relates to a method for separating organic / inorganic components of sludge; it is used for sludge treatment in sewage treatment plants, water environment treatment to clean out bottom sludge, and sludge treatment for clearing ditches in pipe networks and the like. Background technique [0002] At present, domestic sludge treatment and disposal technologies mainly include three mainstream processes: composting, drying + incineration, wall-breaking pretreatment + anaerobic digestion. [0003] Some areas in my country have begun to use sewage treatment plant sludge compost for soil improvement and urban greening, and a few areas use sludge as a substrate to make compound fertilizers for agriculture. However, due to the pathogenic bacteria, heavy metals and other components contained in sludge may cause secondary pollution to the soil, which will threaten food safety, the final outlet after sludge composting is limited is the limiting factor r...

AI Technical Summary

Problems solved by technology

[0007] However, my country's sludge treatment and disposal is still in its infancy. More than 80% of the urban sewage sludge in the country has not been stabilized. After simple sludge dehydration, it is directly disposed of by landfill, incineration, etc.

The result of this is: the sludge volume is huge, resulting in huge sludge disposal costs; the sludge is extremely unstable, and once the organic components in the sludge are corrupted, it will cause serious secondary pollution to the environment; the useful resources in the sludge are not available. Therefore, it is urgent to develop new sludge treatment technology, make full use of useful components in sludge, and realize sustainable treatment, disposal, development and utilization.

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