Integrated toxic and refractory wastewater treatment device and treatment method

Abstract

The invention discloses an integrated toxic and refractory wastewater treatment device and a treatment method. The device includes a series-connected adjustment tank, a first-stage reactor, a second-stage reactor, a third-stage reactor, a coagulation sedimentation tank, a biochemical reaction Pool, also includes aeration blower. Both the first-stage reactor and the third-stage reactor are advanced oxidation reactors, the second-stage reactor is a Fenton reactor, and the coagulation and sedimentation tanks include 2 to 4 stages, and the coagulation and sedimentation tanks at all levels are composed of coagulation reaction The biochemical reaction pool is composed of anoxic pool, aerobic pool, sedimentation pool and clear water pool. The wastewater treatment method provided by the invention combines the toxic and refractory wastewater treatment device with reasonable process parameters, effectively coupling the Fenton-like reaction and the Fenton reaction, the two cooperate with each other, and at the same time match the appropriate coagulation sedimentation and biochemical The reaction process can strengthen the wastewater treatment effect, improve the efficiency of wastewater treatment and reduce the cost of wastewater treatment.

Description

technical field [0001] The invention belongs to the field of toxic and refractory wastewater treatment, and relates to a device for treating toxic and refractory wastewater and a method for treating toxic and refractory wastewater. Background technique [0002] At present, toxic and refractory wastewater mainly uses Fenton and Fenton-like reactions for physical and chemical pretreatment. Fenton's method refers to H 2 o 2 in Fe 2+ Under the catalytic action of · ); the Fenton-like method refers to the conversion of zero-valent iron and iron-based multi-metallic materials under the condition of oxygen 2 reduced to H 2 o 2 , then at Fe 2+ Under the catalytic action of the catalyst, the strong oxidizing HO is generated in situ · . HO produced by Fenton reaction and Fenton-like reaction · It can non-selectively and quickly mineralize toxic and refractory pollutants in wastewater, or decompose and convert toxic and refractory pollutants into small molecular substances th...

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Problems solved by technology

[0003] The existing Fenton-like reactors are mainly in the form of fixed beds, and the fixed-bed Fenton-like reactors have the problems of easy compaction and passivation of the filler and low mass transfer efficiency in the reactor.

In order to solve the problems of packing compaction and low catalyst utilization efficiency, CN101979330B discloses a drum-type micro-electrolysis reaction device, and CN102276018B discloses a submerged iron-carbon micro-electrolysis reactor. passivation to prevent filler compaction

However, the use of this type of device still has the following disadvantages: (1) the energy consumption of rotating the reactor or the packing drum is high, resulting in high operating costs; (2) although the rotating can make the packing turn over, it cannot make the packing roll over the entire reactor. The interior is in a fully fluidized state, and the mass transfer efficiency is limited, which is not conducive to the improvement of wastewater treatment efficiency.

[0004] CN104876319A discloses a Fenton-like reactor, which fluidizes the filler in the reaction tank by means of mechanical stirring and waste water reflux to prevent the filler from compacting and passivating, but the device needs to rely on stirring to assist the filler flow It is not conducive to the reduction of energy consumption. This device still cannot completely avoid the central deposition of fillers at the bottom of the reaction tank, which is not conducive to the further improvement of mass transfer efficiency in the reaction tank.

That is, to use this method for wastewater treatment, at least 5 reaction tanks connected in series and 2-stage sedimentation tanks are required, and the equipment costs are high and the floor area is large.

At the same time, when this method treats wastewater, ozone is introduced into the Fenton reactor, and a certain height of activated carbon is filled in the tank of the Fenton reactor. On the one hand, the cost of ozone treatment is high, and ozone treatment needs to be equipped with ozone Remove the equipment to avoid environmental damage caused by the escape of residual ozone, which further increases the cost of wastewater treatment. On the other hand, the activated carbon filled in the reaction tank will affect the pollutants, corrosion products, active substances, degradation products, etc. in the liquid Mass transfer efficiency between phases and packings, reducing wastewater treatment efficiency

In addition, the above-mentioned Fenton-like reactor needs to rely on the joint action of mechanical agitation and wastewater reflux to realize the fluidization of the filler, and the energy consumption is too high, which is not conducive to the reduction of wastewater treatment costs. Moreover, because the Fenton-like reactor cannot completely Avoid the sedimentation of the filler at the bottom of the reaction tank, which hinders the further improvement of the fluidization degree of the filler, which also limits the further improvement of the wastewater treatment efficiency

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