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A method and device for treating phosphorus-containing wastewater using multi-plate baffle electrocoagulation technology

A technology of technical treatment and electrocoagulation, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. Complete and other problems, to avoid the decline of electrolysis efficiency, avoid electrolysis short flow, reduce the effect of processing costs

Active Publication Date: 2017-07-07
中国中化股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing electrocoagulation wastewater treatment technology has several disadvantages: first, the anode generates a high concentration of metal cations after electrification and electrolysis, and an ion concentration gradient is formed between the ion concentration of the solution near the electrode and the bulk solution, and the concentration polarization will affect the electrode. plate electrolysis efficiency; second, iron electrode electrolysis produces ferrous ions, and ferrous ions react with color-forming substances in water to form organic iron compounds that are difficult to flocculate and settle, causing the raw water to change color; third, the flocculated sediment quickly sinks to the bottom of the pool, and the reaction incomplete
Fourth, multi-plate parallel electrolysis is prone to electrolytic short circuit

Method used

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  • A method and device for treating phosphorus-containing wastewater using multi-plate baffle electrocoagulation technology
  • A method and device for treating phosphorus-containing wastewater using multi-plate baffle electrocoagulation technology
  • A method and device for treating phosphorus-containing wastewater using multi-plate baffle electrocoagulation technology

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Embodiment 1

[0022] The multi-plate baffle electrocoagulation treatment process for phosphorus-containing wastewater uses high-molecular organic resin as the electrolytic cell, with a size of 200mmx200mmx200mm and an effective volume of 4L. Iron plate and aluminum plate are used as electrodes, the plate size is 105mmx87mmx2mm, and the effective area is 78.8cm 2 , set 8 kinds of anodes and cathodes and their arrangements, and the distance between the plates is 1.5cm. NaOH solution is used to adjust the pH value of wastewater to 7.0-8.0, the initial total phosphorus concentration is 10.0mg / L, and DC power supply is used for batch electrolytic treatment with a current density of 2.54mA / cm 2 , the aeration rate is 0.25L / (L·min), and the total electrolysis time is 15-30min. After the drained water was allowed to stand for 30 minutes, the total phosphorus concentration of the sample was measured. Table 1 shows the electroflocculation phosphorus removal effect of different cathode and anode pla...

Embodiment 2

[0026] The multi-plate baffle electrocoagulation treatment process for phosphorus-containing wastewater uses high-molecular organic resin as the electrolytic cell, with a size of 200mmx200mmx200mm and an effective volume of 4L. The iron plate is used as the anode and the aluminum plate is used as the cathode. The size of the plate is 105mmx87mmx2mm, and the effective area is 78.8cm 2. The distance between the anode and cathode plates is set to 4 levels, 1cm, 1.5cm, 3cm, 4cm. Use NaOH solution to adjust the pH value of wastewater to 7.0-8.0, the initial total phosphorus concentration is 10.0mg / L, and use DC power supply for batch electrolysis treatment with a current density of 2.54mA / cm 2 , the aeration rate is 0.25L / (L·min), and the electrolysis time is 30min. After the drained water was allowed to stand for 30 minutes, the total phosphorus concentration of the sample was measured. Table 2 shows the phosphorus removal effect of electrocoagulation with different plate spaci...

Embodiment 3

[0030] The multi-plate baffle electrocoagulation treatment process for phosphorus-containing wastewater uses high-molecular organic resin as the electrolytic cell, with a size of 140mmx55mmx185mm and an effective volume of about 1.20L. Set two sets of electrolysis, one set of non-induction, the electrode connection mode is Fe(+)-Fe(-)-Fe(+), the other set is induction electrolysis, the electrode arrangement is Fe(+)-Fe (sensing electrode plate)-Fe(-), the specifications of the plates are 145mmx60mmx2mm, and the effective area of ​​the single plate is 71.5cm 2 , The distance between the positive and negative plates is 1.5cm. Using the baffle electrolysis method, the waste water folds and flows along the plate, the pH value of the waste water is adjusted to 7.0-8.0 by using NaOH solution, the initial total phosphorus concentration is 10.0 mg / L, and the DC power supply is continuously flowed for electrolysis treatment, with a conductivity of 150 μS / cm. The current density is 2.5...

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Abstract

The invention belongs to the technical field of environmental engineering sewage treatment, and specifically relates to a method and a device for treating phosphorus-containing waste water by adopting a multi-plate baffle electric flocculation technology. Adjust the pH value of the waste water to 7.0‑8.0 with lye; after adjustment, it is pumped into the electrocoagulation tank through the peristaltic pump and flows through the folding of the multi-plate. , collect the discharged water and let it stand for 30 minutes, discharge the supernatant, and recover the flocs; the power supply of the electrocoagulation tank is a DC power supply, the current density is 1.27-5.08mA / cm2, and the electrolysis time is 2min-48h. The technical features of the present invention are: waste water folds and flows along the polar plate, avoids short flow of waste water, increases the chance of contact between the pollutants in the waste water and the high-concentration flocculant at the electrolytic plate, facilitates flocculation and precipitation, and thus improves the treatment effect of pollutants . The multi-electrode baffle electrocoagulation dephosphorization technology of the present invention is suitable for treating medium and low concentration inorganic phosphorus wastewater, and requires simple equipment, easy operation, low cost and stable operation, and is a very potential electrochemical dephosphorization technology.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage treatment, and specifically relates to a method and a device for treating phosphorus-containing waste water by adopting a multi-plate baffle electric flocculation technology. Background technique [0002] Most of the phosphorus-containing wastewater comes from domestic sewage, chemical sewage, animal husbandry sewage, and fertilizer loss from cultivated land. Phosphorus is one of the main elements that cause eutrophication of water bodies. Eutrophication of water bodies causes plankton to multiply in large numbers, causing water to turn black and smelly, destroying the beauty of the living environment, affecting the survival of aquatic organisms, causing the deterioration of surface water bodies, and threatening human beings. healthy. According to my country's "Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), the Class A standard for the total phosph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/463C02F1/58
Inventor 段秀梅黄剑宇张大明
Owner 中国中化股份有限公司
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