Method and device for treating phosphorus wastewater by adopting multi-electrode baffling electric flocculation process

Abstract

The invention belongs to the technical field of sewage treatment in environmental engineering, and particularly relates to a method and a device for treating phosphorus wastewater by adopting a multi-electrode baffling electric flocculation process. The PH value of wastewater is regulated with alkaline liquor to 7.0-8.0; the regulated wastewater is pumped into an electric flocculation tank through a peristaltic pump, is subjected to electrolytic flocculation treatment through the baffling of a multi-electrode under the condition of aeration, and then is discharged through an overflow launder, the discharged water is collected and left to stand for 30 minutes, a liquid supernatant is discharged, a floc is recycled; a power supply of the electric flocculation tank is a direct current power supply, the current density is 1.27-5.08mA / cm<2>, and the electrolysis time is 2 minutes to 48 hours. The technical characteristics are as follows: the wastewater baffles along the multi-electrode, then the short stream of the wastewater is avoided, the chance of enabling a pollutant in the wastewater to be in contact with a high-concentration flocculating agent in an electrolysis plate is increased, the flocculent precipitation is promoted, so that the pollutant treatment effect is improved. The multi-electrode baffling electric flocculation process is suitable for treating inorganic phosphorus wastewater at medium and low concentrations, needed equipment is simple, easy in operation and low in cost, and runs stably, so that the process is an electrochemistry phosphorous removal process having a high potential.

Description

Technical field [0001] The invention belongs to the technical field of environmental engineering sewage treatment, and specifically is a method and device for treating phosphorus-containing wastewater by adopting a multi-polar plate baffle electric flocculation technology. Background technique [0002] Most of the phosphorus-containing wastewater comes from domestic sewage, chemical sewage, livestock sewage, and loss of fertilizer from cultivated land. Phosphorus is one of the main elements that cause the eutrophication of water bodies. The eutrophication of water bodies causes the plankton to multiply, which causes the water quality to turn black and smelly, destroy the beauty of the living environment, affect the survival of aquatic organisms, cause the deterioration of ground water bodies, and threaten humans. health. According to my country's "Urban Sewage Treatment Plant Discharge Standard" (GB18918-2002), the first level A standard for total phosphorus emission of urban se...

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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

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