Method for treating wastewater with conductive filter material and achieving regeneration

A technology for filtering materials and treating waste water, applied in the environmental field, can solve the problems of increasing the cost of backwashing, secondary pollution, incomplete backwashing, and speeding up the washing speed, and achieves easy automatic control, high elution efficiency, and short processing time. Effect

Active Publication Date: 2016-06-22
CHINA CONSTR THIRD BUREAU GREEN IND INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The backwashing process can wash away some of the particles in the pores of the filter material and the waste in the pores that are not firmly absorbed, but it is difficult to wash out the solidly attached waste particles in the pores
This is because although the fluid flow rate in the backwashing process is fast, the intricate pores of the filter material make it difficult to increase the fluid flow rate in the pores, and it is difficult to completely wash away the solid attachments in the pores.
In order to solve the problem of incomplete backwashing, domestic and foreign engineers and technicians have proposed improved backwashing methods, including ultrasonic oscillation assistance, adding cleaning agents, and accelerating the washing speed, etc., but there are certain application problems
Ultrasonic oscillation requires a large area of ​​ultrasonic equipment, adding cleaning agents increases the cost of backwashing and causes secondary pollution, and increasing the washing speed increases the amount of backwashing water, which not only increases the cost, but also often fails to meet expectations

Method used

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  • Method for treating wastewater with conductive filter material and achieving regeneration
  • Method for treating wastewater with conductive filter material and achieving regeneration
  • Method for treating wastewater with conductive filter material and achieving regeneration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Conductive tungsten carbide filter material is used for the filtration treatment of turbid surface water. like figure 1 As shown, the experimental device includes a filter tube 1 with a length of 30 cm, an inner diameter of 4 cm, and a thickness of 2 cm. The filter tube is a porous ceramic filter tube made of tungsten carbide (the average pore size is 0.1-1 micron), and the ceramic tube is connected to the cathode of the DC power supply through a metal molybdenum wire. There is also a ruthenium-titanium thin rod anode in the middle of the filter tube, with a length of 30 cm, which is used as the anode of the electrolysis process during work, and the connection mode of the lead is the same as that of the cathode. Water inlet pipe 4 and water outlet pipe are arranged on the filter pipe, and the remaining parts are sealed, and the pumping pressure is 0.2-0.4MPa during work. The filter tube is placed in the clean water tank 2. During operation, the clean water passing thr...

Embodiment 2

[0028] Electroactive tungsten carbide filter material is used for the treatment of oily catering wastewater. The experimental device, material manufacturing method and experimental method of Example 2 are the same as those of Example 1, and the obtained experimental results are shown in the table below. The oily catering wastewater was taken from the grease trap of a catering wastewater treatment facility, and the oil content was determined to be 0.45g / L after organic solvent extraction, and the filtration experiment run period was 72 hours. Record the water level in the clean water tank and calculate the water output in a certain unit time. The result is as follows:

[0029]

[0030] It can be seen that the water flux retention rate of the electrolysis experimental group after 72 hours is significantly higher than that of the non-electrolysis group, indicating that electrolysis can maintain the treatment capacity for oily catering wastewater and maintain the water flux re...

Embodiment 3

[0032] Titanium nitride filter material is used for the filtration treatment of turbid surface water. The experimental device is the same as in Example 1, but the material of the filter tube used is titanium nitride filter material, and the electrical connection is the surface contacting the titanium nitride layer. The filter material is based on an ordinary alumina tube, depositing a layer of porous titanium nitride electroactive covering layer (inner wall of the tube), the layer thickness is 0.7mm, and the average pore size of the active layer is 0.7 microns. Experimental group 1 did not apply electric field, and experimental group 2 applied electric field, and carried out electrolysis while filtering. After the filtration starts, the pumping pressure is controlled to be 0.2MPa, the operation period is 3 days, the voltage of the electrolysis group is 5V, and the water quality parameters of the treated surface water are the same as those in Example 1.

[0033] Record the wat...

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Abstract

The invention provides a method for treating wastewater with a conductive filter material and achieving regeneration. The conductive filter material is made into a pipe shape suitable for pressure filtering, namely, a filter pipe, and the filter pipe is connected with the negative electrode of an electrolytic power supply; an inert electrode is arranged in the center of the filter pipe and connected with the positive electrode of the electrolytic power supply; one end of the filter pipe is provided with a water inlet pipe for pumping in wastewater to be treated, and the other end of the filter pipe is provided with a water outlet pipe. In the filtering process, the electrolytic power supply carries out power supply and electrolysis at the same time, or when the water outlet amount is obviously decreased after filtering is carried out for a period of time, electrolysis is started to recover the filtering performance of the filter pipe. In the electrolysis process, hydrogen bubbles are constantly generated in pore channels of the filter material serving as a negative electrode and generate huge bubble pressure in the growing process, so that particles filling the pore channels of the filter material are rapidly separated from a biological membrane, and the filtering performance of the filter material is rapidly recovered. The method solves the problems that a conventional filter material is difficult to regenerate, short in service life and the like.

Description

technical field [0001] The invention belongs to the field of environmental technology, and in particular relates to a method for treating waste water and regenerating it by using a conductive filter material. Background technique [0002] Filtration is a simple and efficient separation technology without secondary pollution. For decades, filtration technology has been widely used in the purification process of contaminated wastewater. Solid particles, colloids, organic matter, harmful ions and bacteria in water can be effectively removed by filtration technology. At present, there are many kinds of widely used filter materials, including sandstone, ore, anthracite, nut shell and carbon materials with granular structure, porous polymeric organic film with block structure, porous ceramics, porous metal and fiber fabrics, etc. These filter materials, in the form of particles or membranes, intercept waste particles through barriers, adsorption bridging, etc., and allow water mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F1/48
CPCC02F1/001C02F1/48C02F2201/48
Inventor 毛旭辉汤丁丁张列宇王雷任迎春
Owner CHINA CONSTR THIRD BUREAU GREEN IND INVESTMENT CO LTD
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