Method for pre-treating difficultly-degradable wastewater by catalyzed iron inner electrolysis fluidized bed

Abstract

The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for pre-treating hard-degradable wastewater by a catalyzed iron inner electrolysis fluidized bed, which comprises the following specific steps that: a suspended catalyzed iron inner electrolysis spherical vector is put into a fluidized bed body, wherein the addition amount of the suspended catalyzed iron inner electrolysis spherical vector is 10 to 60 percent of the active volume of the fluidized bed body; wastewater to be treated is introduced through a water inlet, and a valve on a reflux pipe or an inlet pipe is opened and regulated; a hydraulic fluidized bed is used as an oxygen-deficiency device or a hydrolysis device, and a reflux amount is determined according to the amount of the treated water, the cross sectional area of the bed body and the bulk specific weight of catalyzed iron fillers; a pneumatic fluidized bed is used as an aerobic treatment device, and the compressed air amount of the pneumatic fluidized bed meets the requirements of filler fluidization on the premise that the dissolved oxygen of the wastewater in the device is between 0.5 and 2.5 mg / L; air supply is 6 to 20 times of the amount of the treated water; when the pneumatic fluidized bed is used as a hydrolysis system, the concentration of the dissolved oxygen is less than 0.5 mg / L; the fillers in the fluidized bed body form circulation under the action of an internal guide cylinder and are discharged from a water outlet pipe through solid-liquid separation in a settling region; and a sludge discharge pipe is used for discharging residual sludge. The method is simple, simple in device structure and strong in operability, and can be adapted to the treating scales of different water yields.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for pretreatment of refractory waste water in a catalytic iron internal electrolytic fluidized bed. Background technique [0002] For a long time, wastewater containing toxic and harmful refractory pollutants has been the focus and difficulty of wastewater treatment in my country. Especially with the improvement of environmental protection discharge standards, it is difficult for a single biochemical technology to meet the existing discharge requirements. Therefore, how to further improve the effect of wastewater treatment , reducing the emission of toxic and harmful pollutants has become a practical problem to be solved urgently. According to the characteristics of this kind of wastewater, most of the treatment methods of physicochemical and biochemical combination are used at present. Among them, physicochemical is usually used as pretreatment....

AI Technical Summary

Problems solved by technology

However, as the running time increases, it is inevitable that the electrolytic filler in the catalytic iron will be blocked, resulting in short flow or channel flow, which will not only increase the head loss, but also weaken the treatment effect of this technology

In order to avoid or reduce the occurrence of such phenomena, it is necessary to take a variety of measures, such as increasing the sedimentation or air flotation treatment unit to reduce the SS concentration of the influent electrolysis system in the catalytic iron, increasing the reflux ratio or implementing rapid water falling technology to improve the flushing of the system , put the electrolytic unit inside the catalytic iron, etc., which will increase the investment and operating costs virtually

In addition, the installation and replacement of the filler in the catalytic iron internal electrolysis system is also troublesome, which limits the popularization and application of catalytic iron internal electrolysis. Therefore, it is urgent to develop a new technology to solve the blockage and installation of catalytic iron internal electrolysis. replacement problem

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