Preparation method of composite carrier particles, composite bioreactor, sewage treatment system and sewage treatment method

Abstract

The invention discloses a preparation method of composite carrier particles with controllable biological carrier particle size, a composite bioreactor, a sewage treatment system and application of the method. Functional mineral powder or organic carbon source powder is loaded in a basic carrier particle structure with the particle size distribution of 30-100 [mu] m, D50 greater than 40 [mu] m and D90 less than 90 [mu] m through a dry powder mixing process to form the composite carrier particles to promote enrichment of nitrogen and phosphorus removal obligate bacteria in a system; then, micro sludge particles with the particle size of 50-500 microns are formed by inducing microorganisms to grow on the composite carrier particles, and the micro sludge particles and the activated sludge jointly form the composite bioreactor. The tiny sludge particles are uniform in size, interception of the tiny sludge particles at the front end of the secondary sedimentation tank can be realized in various low-energy-consumption modes, and the actual operation solid load of the secondary sedimentation tank is reduced while the microbial biomass of a biochemical tank is increased; in addition, through the recovery and separation effect of the hydrocyclone in the sludge discharging process, efficient recovery of tiny sludge particles is achieved.

Description

technical field [0001] The invention relates to the field of environmental technology, in particular to a composite carrier particle with a controllable biological carrier particle size and a preparation method thereof, a composite bioreactor with a controllable biological carrier particle size, and a method and system for treating sewage. Background technique [0002] With the increasingly prominent environmental capacity and water environment problems, the requirements for environmental protection continue to increase. Existing sewage treatment plants are faced with the requirement to upgrade the effluent quality from the first-class B standard to the first-class A standard or even higher standards. There are two types of wastewater biological treatment methods currently commonly used: [0003] (1) One is the activated sludge method, which is characterized in that the microorganisms that treat the sewage are in a suspended state in the bioreactor; [0004] (2) The second...

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Problems solved by technology

[0006] (1) Limited by the suspension growth characteristics, the microbial diversity is not perfect, which affects the effect of advanced treatment;

[0007] (2) Limited by the parameters of the sewage treatment process, the growth cycle of some key microorganisms is limited;

[0008] (3) Limited by the change of influent water quality, the supply of nutrients for microbial growth fluctuates, affecting biological activity and actual treatment effect

[0010] (1) After the combination of carrier particles and floc sludge, the separation is difficult and easy to be lost with the sludge;

[0011] (2) The micron particle size cannot be adjusted, and the floc sludge treated in the biochemical tank cannot be separated, resulting in a huge load of the secondary sedimentation tank, which cannot match the treatment efficiency of the biochemical tank;

[0012] (3) The subsequent sludge sedimentation treatment in the secondary sedimentation tank is more difficult

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