Bidirectional flow internal circulation type PS advanced oxidation reactor and sewage treatment method

Abstract

The invention discloses a bidirectional flow internal circulation type PS advanced oxidation reactor and a sewage treatment method. The bidirectional flow internal circulation type PS advanced oxidation reactor comprises a reactor, wherein an inner barrel and an outer barrel which are staggered up and down and are concentric to each other are arranged in the reactor; the upper end of the inner barrel is open; the lower end of the inner barrel is connected with the bottom of a reactor tank; the upper end of the outer barrel is connected with the top of the reactor tank; the lower end of the outer barrel is open; the bottom of the reactor tank is provided with a power-free self-priming backflow system and an umbrella-shaped conical water distributor; the lower end of a catalyst dosing pipe which stretches to the bottom from the top of the reactor tank is correspondingly communicated with an umbrella-shaped conical medicine distributor; the umbrella-shaped conical medicine distributor is positioned in a water-distributing mixed area of the reactor; the reactor also comprises a circular water distribution baffle, a water inlet mixing device and a secondary dosing device. The reactor is small in height-diameter ratio, the reaction space is fully utilized, the capacity load rate is high, the power consumption is low, the unreacted pollutants and agents are repeatedly treated in the power-free backflow system, the agent utilization rate is improved, the agent consumption and energy consumption are reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to a waste water treatment device and a sewage treatment process, in particular to a two-way internal circulation type PS advanced oxidation reactor and a sewage treatment method. Background technique [0002] High-concentration organic wastewater is one of the problems in industrial wastewater treatment. It generally has the characteristics of poor biodegradability and large relative molecular weight of pollutants. [0003] The existing biological treatment methods are difficult to deal with the large molecular weight organic pollutants that are difficult to biodegrade, and the advanced oxidation method generates extremely active free radicals (hydroxyl radical OH·, sulfate radical SO 4 - etc.), can effectively oxidize macromolecular refractory organic substances into low-toxic or non-toxic small molecular substances, and has the characteristics of high reaction efficiency, fast reaction speed, complete degradation of organic su...

AI Technical Summary

Problems solved by technology

However, there are some problems in the treatment of high-concentration organic wastewater by the Fenton oxidation method, including: (1) The pH of the Fenton method needs to be kept at about 2.5 to 4 to prevent the precipitation of ferrous iron in order to achieve a good treatment effect. Most wastewater biochemical After the treatment, the pH is in the near-neutral or alkaline range, and the subsequent advanced oxidation treatment needs to add a large amount of acid to the system, resulting in high treatment costs; (2) Most of the Fenton reaction equipment (such as fluidized bed) has a relatively large height and diameter , large hydraulic loss and low volume utilization rate, resulting in difficult construction and high energy consumption; (3) It is difficult to form hydraulic conditions in different regions according to the requirements of different reaction stages inside the reactor, and short flow is prone to occur, resulting in low efficiency of chemical utilization; ( 4) The free ferrous ions in the system are easily oxidized, and Fe 2+ Homogeneous catalysis produces free radicals with extremely fast reaction rates and excess Fe 2+ It will compete with pollutants for free radicals, which will easily cause local Fe in the reactor 2+ Excessive reduction of free radicals generated by catalysis, resulting in Fe 2+ and free radicals are rapidly consumed, while oxidants in other local areas are not effectively catalyzed, and the generation and utilization efficiency of free radicals is low; (5) The remaining oxidants and catalysts in the advanced oxidation reaction cannot be recycled and reused, resulting in waste of chemicals and form secondary pollution

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