Drainage treatment method

A technology of drainage treatment and process, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem that the treatment method cannot be carefully controlled.

Inactive Publication Date: 2016-10-12
OMEGA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, fine-grained control cannot be performed with this type of drainage treatment

Method used

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Effect test

Embodiment approach 1

[0048] like figure 1 As shown, in the wastewater treatment method of this embodiment, the wastewater (sewage raw water) 1 is first supplied to the electrolytic cell 2 without a diaphragm. In order to impart conductivity to drainage 1 and supply available chlorine (Cl 2 , HOCl, OCl － ) based on the chloride ion (Cl － ), and NaCl was added to the drainage 1 so that the salt concentration of the drainage 1 was about 3%.

[0049] In addition, electrolysis (2Cl － → Cl 2 +2e － , Cl 2 +H 2 O→HOCl+HCl), and oxidatively decomposes the dirty components (mainly organic components) in the wastewater by the generated hypochlorous acid (HOCl). In addition, the fouling components are directly oxidized by contact with the anode electrode, thereby being decomposed. Furthermore, the pollution components are decomposed by hydroxyl radicals (·OH) generated by electrolysis.

[0050] This wastewater treatment method includes an anode side treatment step through the anode side 3 (electroly...

Embodiment approach 2

[0065] like figure 2 As shown, in the wastewater treatment method of this embodiment, the wastewater (sewage raw water) 1 is first supplied to the electrolytic cell 2 without a diaphragm. In order to impart conductivity to drainage 1 and supply available chlorine (Cl 2 , HOCl, OCl － ) based on the chloride ion (Cl － ), and NaCl was added to the drainage 1 so that the salt concentration of the drainage 1 was about 3%.

[0066] In addition, electrolysis (2Cl － → Cl 2 +2e － , Cl 2 +H 2 O→HOCl+HCl), and oxidatively decomposes the dirty components (mainly organic components) in the wastewater by the generated hypochlorous acid (HOCl). In addition, the fouling components are directly oxidized by contact with the anode electrode, thereby being decomposed. Furthermore, the pollution components are decomposed by hydroxyl radicals (·OH) generated by electrolysis.

[0067] Next, in the anode side treatment process (electrolysis path on the anode side 3), the concentration of h...

Embodiment approach 3

[0072] like image 3 As shown, the wastewater treatment method of this embodiment is to increase the hydrogen ion concentration of the wastewater 1 in the cathode side treatment process (the electrolysis channel of the cathode side 4), so that chlorine gas (refer to Embodiment 2) can be easily dissolved, and it is not necessary to In 1, alkali such as sodium hydroxide (NaOH) is added, but the electrolytic pathway on the cathode side can be used to increase the hydrogen ion concentration pH, thereby making chlorine gas (Cl 2 ) is easy to dissolve, and can reduce the amount of alkali added, thereby reducing or even reducing the cost of the medicament.

[0073] That is, the pH tends to increase (2H 2 O+2e － →H 2 +2OH － ), while chlorine gas (Cl 2 ) is easily soluble (Cl 2 +2OH － → 2HOCl), and in the chlorine gas dissolving tank 9, the remaining available chlorine in the anode side treatment process (the electrolysis path of the anode side 3) described later can be foamed a...

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Abstract

Provided is a drainage processing method, which can conduct a more detailed control. The drainage processing method comprises a positive electrode side treatment process which enables drainage to pass through a positive electrode side (3) having diaphragm electrolysis, and a negative electrode side treatment process which enables drainage to pass through a negative electrode side (4). Phenomena in the positive electrode side treatment process and in the negative electrode side treatment process and characteristic change of drainage can be combined to conduct a control. A negative ion exchange membrane (5) can be used as the membrane (P). In the negative electrode side treatment process, chloride ions contained in the drainage moves towards the positive electrode side (3) to reduce the chloride ions.

Description

technical field [0001] The present invention relates to a wastewater treatment method utilizing electrolysis with a diaphragm system. Background technique [0002] A method of treating wastewater has been proposed in the past (Patent Document 1). [0003] That is, the waste liquid or drainage containing refractory substances is introduced into the electrolysis device whose anode is a conductive ceramic electrode, and 10A / dm 2 The above high current density conducts electrolysis to generate hypohalous acid and active oxygen in waste liquid or drainage, and imparts strong oxidative decomposition. The strong oxidative decomposition action refers to the anodic oxidation by electrolysis performed at a high current density and the oxidative decomposition action by the hypohalous acid and active oxygen generated there. [0004] Active oxygen such as hydroxyl radicals are generated at the anode and are powerful, but such active oxygen such as hydroxyl radicals have a short life. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461
Inventor 中村信一
Owner OMEGA CO LTD
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