Sludge treatment method and device

Abstract

The invention provides a sludge treatment method and device, relating to the field of waste recycling. The method comprises the following steps: adding strong acid or strong base solution with weight not lower than 10% of the weight of to-be-treated sludge to the to-be-treated sludge and stirring the substances to react to obtain a solid-liquid mixture; carrying out solid-liquid separation on the solid-liquid mixture to obtain filtrate and a solid part; carrying out solid-liquid separation after concentrating the filtrate to obtain a solid precipitate; drying the solid precipitate and then adding water to elute the solid precipitate to obtain a recycled solution and a solid insoluble substance respectively; regulating the pH value of the solid part to be neutral and landfilling or burning the solid part after compressing the solid part. The method provided by the invention has the beneficial effects that the degradation time of pollutants is reduced through chemical reaction, so that a great number of pollutional components are dissolved in strong acid or strong base and a small quantity of solid parts which basically do not contain pollution sources is obtained, thus reducing the burning quantity and the area occupied by landfilling and avoiding secondary pollution.

Description

technical field [0001] The present invention relates to the field of waste recycling, in particular to a sludge treatment method and device thereof. Background technique [0002] Sewage treatment technology is a technology that realizes water purification after enriching pollutants in water by certain technical means. Large-scale sewage treatment projects generally need to be completed in special sewage treatment plants. [0003] The sludge produced by the sewage treatment plant forms a new pollutant. Although the sludge reduction treatment has been vigorously promoted, the amount of sludge is still large and the treatment is still difficult. [0004] At present, the main processes of sludge treatment are mud-water separation (separation of mud-water by physical means such as filter press or centrifugation), landfill, composting or incineration. [0005] Among them, the landfill is mostly for the centralized storage of the sludge after the separation of the mud and water, s...

AI Technical Summary

Problems solved by technology

[0005] Among them, the landfill is mostly to store the sludge after the separation of mud and water, so that the organic matter contained in it can be naturally degraded; while composting (sludge after separation of mud and water) can properly utilize sludge as a resource, but because the composition of composting is complex , and even breed some harmful microorganisms, there are very few components that can be used as fertilizers, and most of the accumulations need to be digested and then landfilled; incineration is mainly to remove the moisture and combustible substances in the sludge after the initial separation of mud and water through high-temperature combustion , and eventually landfill, which cannot achieve the effect of pollutant separation in sludge

[0006] In addition, the methods of landfill and composting rely on natural ability to degrade the organic matter in the sludge, which occupies a large area and takes a long time, and the undegradable substances in the sludge are still concentrated, which is likely to cause the enrichment of pollutants in some areas. lead to secondary pollution

[0007] For the incineration treatment, the water, carbon-containing substances and volatile substances in the sludge are removed by high-temperature calcination, and the residue after incineration still needs to be landfilled; this operation cannot recover the active components in the landfill, and there are also The risk of causing secondary pollution, and the incineration operation consumes a lot of energy, is expensive, and is not environmentally friendly

[0008] In addition, in the existing technology, the common sludge treatment equipment is bulky and complicated to operate. For different sludge treatment stages, there are different equipment corresponding to them, and the integration has not been realized, which is very inconvenient for the centralized treatment of the entire sludge.

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