Method and fluidized bed for purifying eutrophic water by using microorganism filler

Abstract

The invention relates to a method and fluidized bed for purifying eutrophic water by using microorganism filler. The method for purifying the eutrophic water by using the microorganism filler comprises the following steps: (a) immobilizing anaerobic bacteria in a material by using an embedding method to form filler particles of which the particle size is 5mm to 10mm; (b) coating the outer layers of the particles with mixed facultative aerobe and aerobic bacteria by virtue of chitosan so as to prepare layered and immobilized microorganism filler for purifying water, wherein the particle size of the microorganism filler is 15mm to 20mm; (c) putting the microorganism filler into a microorganism fluidized bed and fixing the fluidized bed at the tail part of a pleasure boat or close to flowing water so that the flowing water flows through the microorganism filler in the fluidized bed and the microorganism filler can be used for removing organic matters, nitrogen and phosphorus out of the eutrophic water body. Therefore, the utilization rate of oxygen, the mass transfer efficiency of organic pollutants in the water and the like are greatly improved; in addition, aged biological membranes can easily fall off from the surface of the filler, so that the membranes are renewed conveniently and the activity of the membranes is maintained.

Description

technical field [0001] The invention relates to the technical field of sewage purification, and specifically refers to a method for purifying eutrophic water by using microbial fillers to pollute water bodies with eutrophication. Background technique [0002] The water pollution of rivers and lakes in my country mainly includes two aspects: nitrogen, phosphorus and other nutrients and organic matter pollution. The technical ways to reduce N, P and organic pollutants in water bodies are the most basic ways of eliminating point sources (interception pollution sources), reducing and controlling non-point source pollution, the most common methods at home and abroad are mechanical dredging, water diversion flushing, chemical and biological remediation. Compared with physical and chemical methods, bioremediation technology can be efficiently completed at room temperature, with good treatment effect, relatively low engineering cost, no or low energy consumption, and operating cost...

AI Technical Summary

Problems solved by technology

[0003] However, the direct application of microbial preparations to treat sewage has the disadvantages of high cost of treatment and unstable effects. In response to this problem, microbial immobilization technology was developed in the 1990s. Fixation to achieve fixed growth, which is beneficial to increase the number of microorganisms in the bioreactor and the solid-liquid separation after the reaction, and is conducive to the removal of nitrogen and high-concentration organic matter or refractory substances, improving the processing capacity and adaptability of the system

The current immobilization technology adopts single-layer embedding or adsorption technology, and uses the porosity of the filler itself to gradually allow different types of aerobic bacteria to grow at different levels in the environment. However, this method has the following problems: First, different types of bacterial agents are positioned at different filler layers to grow and form biofilms, which requires a slow process; second, it is usually impossible to obtain efficient anaerobic bacteria, which greatly reduces the treatment effect of immobilized microorganisms

In this way, because the filler is usually still in the water body, the action of microorganisms is relatively slow, and the biofilm is easy to age.

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