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

A fluidized bed and internal electrolysis technology, which is applied in anaerobic digestion treatment, chemical instruments and methods, sustainable biological treatment, etc. problems such as operating costs, to achieve the effect of improving the biodegradability of wastewater, simplifying the installation and replacement process, and widening the pH range

Inactive Publication Date: 2010-04-07
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0021] like figure 1 As shown, the wastewater from a certain fine chemical industry enters through the water inlet 4, and the return port 6 is adjusted to make the rising flow rate 3m / h, the diameter of the electrolytic filler in the suspended catalytic iron used is 25mm, and the iron-copper mass ratio is 10:1. The addition rate was 40%, and the reaction time in the packing zone was 2.0 h. Under this operating condition, the removal rate of COD, chroma, TP and the improvement of BOD / COD in the effluent of the fluidized bed are equal and greater than the effect of traditional catalytic iron internal electrolysis, but there is no decrease in treatment efficiency after continuous operation for 3 months. There is also no clogging problem, while the traditional catalytic iron internal electrolysis system needs to adopt a mechanical stirring method every 15d or so to ensure the stable operation effect.

Embodiment 2

[0023] like figure 2 As shown, the comprehensive wastewater of a chemical park enters the fluidized bed system through the water inlet 4, and the air inlet 7 is controlled so that the dissolved oxygen concentration in the system is about 0.3 mg / L. Suspended catalytic iron electrolytic packing with a diameter of 25 mm and a mass ratio of iron to copper of 20:1 was used as the carrier in the fluidized bed, the dosage rate was 20%, and the reaction time in the packing area was 1.0 h. At the same time, hydrolysis acidification sludge is added to realize the coupling of catalytic iron internal electrolysis and hydrolysis acidification. Under the dual action of gas and water, the carrier and sludge in the system are in a fluidized state, and the COD, TP removal rate and BOD / COD change values ​​of the final effluent are equal and greater than the traditional hydraulic retention time and the electrolysis reaction time in the catalytic iron. Advection catalytic iron / hydrolysis acidif...

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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....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/28C02F3/12
CPCY02W10/10
Inventor 刘志刚胡坚马鲁铭吴德礼赵冀平王红武魏保平樊金红陈恒宝
Owner TONGJI UNIV
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