Combined device for deeply purifying tail water of urban sewage treatment plant and operation method

Abstract

The invention discloses a combined device for deeply purifying tail water of an urban sewage treatment plant and an operation method, belonging to the technical field of sewage treatment. The device is composed of an intermittent aeration activated carbon biofilter and a three-dimensional S-shaped channel plant floating bed, wherein the intermittent aeration activated carbon biofilter successively comprises a water inlet tube, a biological activated carbon layer, a graded gracel layer, a water outlet tube, an aeration tube and the like from top to bottom; the three-dimensional S-shaped channel plant floating bed is composed of an upper layer of S-shaped channel and a lower layer of S-shaped channel; because the plant floating bed is made of buckle plates with holes, the plant floating bed is convenient to install and good for the growth of plant roots; the intermittent aeration activated carbon biofilter can be utilized to trap and decompose solid suspended matters and organic matters in tail water, and nutrient matters can be partially removed; and the three-dimensional S-shaped channel plant floating bed can further adsorb nutrient matters in the tail water. In the combined device, different filter materials and plant floating bed materials can be replaced according to the water quality characteristic of sewage and regeneration reuse requirements, and the combined device is flexible to operate and can purify various contaminated water bodies.

Description

technical field [0001] The invention relates to a sewage treatment device, in particular to a combined device for deep purification of tail water of urban sewage treatment plants. Background technique [0002] In the context of the increasing shortage of water resources today, sewage reuse has become an important way to solve the shortage of water resources, and has received widespread attention in various countries. As a stable water source, urban tail water can be treated in depth according to the characteristics of the tail water and reused as a secondary water source for cities, which will certainly alleviate the water crisis faced by many cities in my country. However, there are still the following problems to be solved urgently in the treatment of urban tail water. First of all, the existing advanced treatment process of urban tail water mainly includes physical filtration of filter material, but the quality of effluent water is poor; the use of chemical precipitation...

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Problems solved by technology

First of all, the existing advanced treatment process of urban tail water mainly includes physical filtration of filter material, but the quality of effluent water is poor; the use of chemical precipitation or oxidant oxidation method is easy to produce secondary pollution, and the cost is relatively high. It is difficult for plants to maintain long-term operation; purely using ultrafiltration membrane technology has limited removal effect on small molecular weight organic matter and nutrient salts. Although nanofiltration and reverse osmosis can achieve high purification effects, they have high requirements for membrane pressure control and relatively high energy consumption. High, because the membrane is easy to block and pollute, the pretreatment requirements are strict, and it is not easy to maintain and manage, so it is not suitable for the advanced treatment of urban tail water

Secondly, because the urban tail water contains multiple pollutants at the same time, relying on the above-mentioned single treatment method cannot ensure high-quality effluent

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