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Process coupling catalyzed iron with biological filter

A biological filter, catalytic iron coupling technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of high cost, no large-scale application, reaction conditions Harsh and other problems, to achieve the effect of increasing the adhesion and solving the difficult problems of "hanging film"

Inactive Publication Date: 2013-04-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the advanced oxidation method has the problems of high oxidant price, difficult recovery of catalyst, harsh reaction conditions, and high cost, so it has not been applied on a large scale.
[0009] At present, my country has put forward stricter requirements on the discharge standards of industrial wastewater treatment, and the above methods are difficult to solve problems in engineering practice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Copper-plated engineering plastics as cathode material (1%)

[0032] Specific steps are as follows:

[0033](1) The waste water from the industry that is difficult to degrade enters the catalytic iron reaction tank, and the pH value of the influent water is controlled to be 6.8; the catalytic iron reaction tank is aerated with an aeration tube, and the dissolved oxygen concentration is controlled to be 0.5mg / L. The catalytic iron bed uses Engineering plastic shavings (thickness 0.5-2 mm, width 5-80 mm) are coated with simple copper on the surface by electroless plating, mixed with iron shavings at a weight ratio of 1%, wherein the weight ratio of copper and iron is 0.3%:1, and Ensure that its bulk density in the pool is 0.5 kg·dm -3 , The hydraulic retention time is controlled at 1h.

[0034] (2) The effluent of the catalytic iron reaction tank is used as the influent of the biofilter for biological treatment, and the pH value of the influent of the biofilt...

Embodiment 2

[0037] Example 2 Copper-plated engineering plastics as cathode material (40%)

[0038] (1) Wastewater from industry that is difficult to degrade enters the catalytic iron reaction tank, and the pH value of the influent water is controlled to be 6.8; the catalytic iron reaction tank is aerated with an aeration tube, and the dissolved oxygen concentration is controlled to 0.5mg / L. The catalytic iron bed uses chemical In the plating method, engineering plastic shavings (thickness 0.5-2 mm, width 5-80 mm) are covered with copper by electroless plating, mixed with iron shavings at a weight ratio of 40%, and the weight ratio of copper and iron is 0.3% :1, and ensure that its bulk density in the pool is 0.5 kg·dm -3 , The hydraulic retention time is controlled at 1h.

[0039] (2) The effluent of the catalytic iron reaction tank is used as the influent of the biofilter for biological treatment, and the pH value of the influent of the biofilter is controlled to be 6.86; the aeration t...

Embodiment 3

[0042] Example 3 Copper shavings as cathode material (copper to iron ratio 1:40)

[0043] (1) Wastewater from industry that is difficult to degrade enters the catalytic iron reaction tank, and the pH value of the influent water is controlled to be 6.8; the catalytic iron reaction tank is aerated with an aeration tube, and the dissolved oxygen concentration is controlled to 0.5mg / L. The catalytic iron bed uses chemical In the way of plating, copper shavings (thickness 40μm-1.5 mm) are mixed with iron shavings at a copper-iron weight ratio of 1:40, and the bulk density in the pool is guaranteed to be 0.3 kg·dm -3 , The hydraulic retention time is controlled at 1h.

[0044] (2) The effluent of the catalytic iron reaction tank is used as the influent of the biofilter for biological treatment, and the pH value of the influent of the biofilter is controlled to be 6.86; the aeration tube is also used in the biofilter to aerate, and the dissolved oxygen concentration is controlled to ...

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Abstract

The invention relates to a process coupling catalyzed iron with a biological filter. A catalyzed iron reaction tank is arranged in front of the biological filter. A catalyzed iron bed is arranged at the upper part of the biological filter, an aerator pipe is arranged at the lower part of the biological filter, and a water inlet is formed at the bottom of the biological filter. A PVC (polyvinyl chloride) packing layer is arranged at the upper part of the biological filter, the aerator pipe is arranged at the lower part of the biological filter, and the bottom of the biological filter is connected with a water outlet in one side of the top of the catalyzed iron reaction tank. The process comprises the following steps: refractory industrial wastewater enters the catalyzed iron reaction tank, the pH value of in-water is controlled within a range of 5.0-10.0; the inner part of the catalyzed iron reaction tank adopts the aerator pipe for aeration, the concentration of dissolved oxygen is controlled within a range of 0.01-5.0mg / L, the stacking density of the catalyzed iron bed is controlled within a range of 0.1-0.5kg / dm-3, and the hydraulic retention time is controlled within a range of 0.5-1 hour; out-water of the catalyzed iron reaction tank is used as the in-water of the biological filter to carry out biological treatment, and the pH value of the in-water of the biological filter is controlled within a range of 6.0-8.0; the inner part of the biological filter also adopts the aerator pipe for aeration, and the concentration of the dissolved oxygen is controlled within a range of 2.0-4.0mg / L-1; and the stacking density of PVC packing in the biological filter is controlled within a rang of 0.01-0.05kg / dm-3, and the hydraulic retention time is controlled within a range of 2.0-4.0 hours. The out-water passing through the biological filter is drained into water. The COD removal rate of the industrial wastewater subjected to the purifying and biochemical treatment by the method can reach 50 percent, and the new standard is stably reached.

Description

technical field [0001] The invention relates to the field of water pollution control engineering, in particular to a sewage advanced treatment process, in particular to a process for advanced treatment of refractory industrial wastewater using a catalytic iron coupled biological filter process. Background technique [0002] With the development of society and the improvement of people's living standards, the requirements for water environment quality are getting higher and higher, and the government continues to formulate stricter wastewater discharge standards. Therefore, the advanced treatment technology of sewage, especially the advanced treatment technology of refractory industrial wastewater has attracted more and more attention. [0003] In the field of sewage treatment, the gravity separation technology using the manual is generally called the primary treatment; the biological method is called the secondary treatment; the advanced treatment after the biological method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 马鲁铭刘飞萍王梦月
Owner TONGJI UNIV
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