A wastewater treatment system and method

Abstract

A waste water treatment device and a method are disclosed. The waste water treatment device comprises an ozone oxidation device and a biochemical treatment device. The ozone oxidation device comprises an ozone destructor and an oxidation reactor. The biochemical treatment device comprises a two-phase expanded bed, an oxygen dissolving device and a circulating pump. An exhaust outlet at the top of the oxidation reactor is connected to a gas inlet of the ozone destructor. A gas outlet of the ozone destructor is connected to a gas inlet at the lower part of the oxygen dissolving device. A water discharging pipeline at the bottom of the oxygen dissolving device and a water discharging pipeline at the lower part of the oxidation reactor are combined and then connected to the circulating pump. The outlet of the circulating pump is connected to a water inlet at the lower part of the two-phase expanded bed. A water outlet at the upper part of the two-phase expanded bed is connected to a water inlet at the upper part of the oxygen dissolving device. The method includes: feeding waste water into the oxidation reactor firstly to subject the waste water to oxidation, and feeding the waste water into the biochemical treatment device to subject the waste water to aerobic biochemical reactions. According to the waste water treatment device and the method, reaction conditions and mass transfer conditions can be optimized, the biochemical treatment load is increased, the oxygen component in the oxidation exhaust and the excess pressure of the exhaust are fully utilized, and the treatment cost is reduced.

Description

technical field [0001] The invention relates to the field of waste water treatment, and more particularly relates to an ozone oxidation-two-phase expanded bed waste water treatment system and method for advanced treatment of waste water. Background technique [0002] In wastewater treatment, aerobic biological treatment is the most commonly used process, but due to the improvement of wastewater discharge standards, the difficulty of biochemical treatment of wastewater has increased accordingly, especially for industrial wastewater with poor biochemical properties, conventional biochemical treatment is difficult to work, for biochemical treatment For wastewater that does not meet the discharge standards, chemical oxidation + biochemical treatment is an effective measure, which has been applied in various industrial wastewater treatments. [0003] Ozone is a strong oxidant that can be produced by discharging air or oxygen in a high voltage electric field. After ozone is added...

AI Technical Summary

Problems solved by technology

[0004] Although the ozone oxidation-biological aerated filter treatment process can effectively degrade organic matter in wastewater, it also has disadvantages such as high investment, high operating cost, large land occupation, and small treatment load.

First of all, the packing bed in the biological aerated filter operates as a fixed bed. After a certain period of time, due to the uneven distribution of water and air, the growth of the biofilm will be uneven, which will lead to a short circuit of the water flow through the packing bed. It affects the overall treatment efficiency; secondly, the waste water to be treated passes through the packing bed at one time, the contact time between the waste water and the biofilm is short, and the stability of the treatment effect is not high; The growing biofilm provides the oxygen needed to degrade organic matter, and the blown air strongly disturbs the biofilm, hindering the growth of the biofilm; fourth, the thickness of the packed bed of the biological aerated filter is about 3m, usually It requires a large bed area, resulting in increased land occupation and investment

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