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Method for treating phosphoric wastewater through ozone-enhanced electrocoagulation

A treatment method and electro-flocculation technology, applied in water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., to achieve the effects of high treatment efficiency, major market development prospects, and simple treatment process

Inactive Publication Date: 2010-01-06
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the treatment of phosphorus-containing wastewater by ozone-enhanced electrocoagulation

Method used

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  • Method for treating phosphoric wastewater through ozone-enhanced electrocoagulation
  • Method for treating phosphoric wastewater through ozone-enhanced electrocoagulation
  • Method for treating phosphoric wastewater through ozone-enhanced electrocoagulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Implementation plan and working principle: Firstly, a comparative experiment of a single ozone oxidation treatment process, a single electro-coagulation treatment process and an ozone-enhanced electro-coagulation treatment process is carried out.

[0028] The ozone-enhanced electrocoagulation treatment process for phosphorus-containing wastewater uses a resin glass electrolytic cell, with iron sheets as the anode and cathode, the distance between the two electrode plates is 50mm, and 50 mg / L KH 2 PO 4 The wastewater is an electrolyte, the pH is not adjusted (pH4.6), the power supply for electrocoagulation is a DC stabilized power supply, and the current density is 15mA / cm 2 , The voltage is 36V, and the ozone flow rate is 20mL / min. It works as follows:

[0029] Anode surface: Fe 0 → Fe 2+ (aq)+2e

[0030] Fe 2+ (aq)+2OH - (aq)→Fe(OH) 2 (s)

[0031] 4Fe 2+ (aq)+10H 2 O(l)+O 2 (g)→4Fe(OH) 3 (s)+8H + (aq)

[0032] Cathode surface: 2H 2 O(aq)+2e→H 2 (g)+2OH...

Embodiment 2

[0056] Electrolyte KH 2 PO 4 The concentrations of wastewater were 50mg / L and 100mg / L respectively, and other conditions of the ozone-enhanced electrocoagulation treatment process were the same as above, and the treatment results are shown in Table 2.

[0057] Table 2 Treatment results of phosphorus-containing wastewater with different concentrations

[0058]

[0059] Monitoring method: with embodiment 1.

[0060] The results in Table 2 show that the increase of phosphorus-containing wastewater concentration decreased the removal of phosphate, in KH 2 PO 4 When the wastewater concentration is 100mg / L, the removal rate of phosphorus-containing wastewater by the ozone-enhanced electrocoagulation wastewater treatment process of the present invention is 85.9% after 15 minutes of reaction.

Embodiment 3

[0062] The current densities used in electrocoagulation are 10mA / cm2 and 15mA / cm2 respectively, with 50mg / L KH2PO4 wastewater as the electrolyte, the pH is not adjusted (pH4.6), and the ozone flow rate is 20mL / min. The residence time of wastewater in the tank is 15min, and the treatment results are shown in Table 3.

[0063] Table 3 Treatment effect of phosphorus-containing wastewater under different current densities

[0064]

[0065]

[0066] Monitoring method: Same as above.

[0067] The results in Table 3 show that at a current density of 10mA / cm 2 Under conditions, the removal rate of phosphorus-containing wastewater by the ozone-enhanced electrocoagulation treatment process of the present invention is 15mA / cm relative to the current density 2 It was slightly lower at 92.8%.

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Abstract

The invention relates to a method for treating phosphoric wastewater through ozone-enhanced electrocoagulation, which uses iron sheets as an anode and a cathode to electrolyze the phosphoric wastewater and introduces ozone at the same time. The method has simple treatment process, is unnecessary to add chemical agents basically, has high treatment efficiency, small equipment volume, easy operation and simple after-treatment, forms no hard fouling, is one of the effective methods for treating the phosphoric wastewater, and has significant market development prospect.

Description

(1) Technical field [0001] The invention relates to an ozone-enhanced electrocoagulation treatment method for phosphorus-containing wastewater. (2) Background technology [0002] Phosphorus-containing wastewater comes from wastewater discharges from chemical, paper, rubber, dye and textile printing and dyeing, pesticide, coking, petrochemical, fermentation, pharmaceutical and medical, and food industries. Phosphorus is a key factor leading to eutrophication of water bodies. Phosphorus-containing wastewater affects the survival of aquatic organisms such as fish and causes the deterioration of surface water bodies, thus threatening human health. [0003] At present, domestic and foreign sewage phosphorus removal technologies mainly include biological method, chemical method and adsorption method. Biological methods such as A / O, A 2 / O, UCT process, has good treatment effect, but requires stricter management, mainly suitable for treatment of low-concentration and organic phos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78C02F1/463
Inventor 何志桥宋爽裘建平徐乐瑾
Owner ZHEJIANG UNIV OF TECH