Sewage treatment system and method for enhancing rapid transfer of organic matter

Abstract

The invention provides a sewage treatment system and method for strengthening fast transfer of organic matters. The system comprises a sludge pretreatment basin, an adsorption-condensation basin, a sedimentation tank and a regeneration tank. The method includes: putting sludge in the sludge pretreatment basin, generating high shear force through fast stirring, and exposing close bond type extracellular polymeric substances with higher aggregation performance in the inner layer of sludge floc; feeding the pretreated sludge into the adsorption-condensation basin, and fully mixing the sludge with sewage under slow agitation to enable the sludge to quickly adsorb organic matters in the sewage and aggregate together again to form sludge floc; feeding mixed liquid containing the sludge floc into the sedimentation tank to stay, enabling supernatant to flow out via a water outlet, feeding part of settled sludge into the regeneration tank via a sludge pump, and discharging the excess sludge to serve as recyclable materials; subjecting the sludge in the regeneration tank to aerobiotic regeneration under the aeration condition, and feeding the sludge into the sludge pretreatment basin through a sludge reflux pump. Compared with the traditional adsorption-regeneration process, the system and method has the advantages that pollutant adsorption and removal rate of the process can be increased by 20-30%, process energy consumption can be lowered by 30-60%, and organic content of the excess sludge is increased by 10-20%.

Description

technical field [0001] The invention relates to a sewage treatment system and method for strengthening activated sludge to absorb organic matter in sewage, and belongs to the fields of waste water treatment and environmental protection. Background technique [0002] Although the currently commonly used activated sludge sewage treatment process can meet the corresponding discharge standards, it has problems such as high energy consumption, high residual sludge volume and greenhouse gas emissions. Due to the rich organic matter in sludge, the resource utilization of sludge has been paid more attention in recent years. Generally, the higher the content of organic matter in the sludge, the higher the value of resource utilization. Activated sludge has a certain adsorption capacity for organic matter in sewage. Based on this, an adsorption-regeneration process consisting of three units of adsorption tank, sedimentation tank and sludge regeneration tank has been proposed, which c...

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Problems solved by technology

However, the key point of this process is to meet the requirements of sewage treatment, without considering the resource utilization of sludge. Therefore, the sludge after the adsorption is completed enters the regeneration tank for aeration regeneration, and all the adsorbed organic matter is degraded to restore the adsorption capacity of the sludge.

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