Biophysical Treatment Process of Electroplating Wastewater

Abstract

The invention relates to a biophysical treatment process of electroplating wastewater. The biophysical treatment process of the electroplating wastewater comprises the following steps: (1) carrying out solid-liquid separation on the electroplating wastewater; (2) enabling liquid obtained from the step (1) to pass through a micro-electrolysis reactor; (3) adjusting pH of the wastewater passing through the micro-electrolysis reactor to be 10, then adding sodium hypochlorite, adjusting the pH value to be 6-7 after reaction, then performing reaction again for 20 minutes, adding a flocculating agent, carrying out flocculating treatment, and then standing to precipitate for 4-6 hours so as to obtain clear supernate; (4) discharging the supernate obtained by treatment in the step (3) to a microorganism reaction tank, adjusting the PH value to be 7-8, feeding 10 g of a biological agent in every cubic meter of liquid, and standing for a week. By the process, the quantity and the quality of treated water are increased, running cost is reduced, and the quality of drained water is promoted to reach the standard.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a biophysical treatment process for electroplating wastewater. Background technique [0002] The sources of electroplating wastewater are generally: (1) plating cleaning water; (2) waste electroplating solution; (3) other wastewater, including washing the floor of the workshop, scrubbing plate washing water, condensed water from ventilation equipment, and leakage from plating tanks. Or various tank liquids and drainages of "running, popping, dripping, and leaking" caused by improper operation and management; (4) Equipment cooling water, which has not been polluted except for the temperature rise during use. The water quality and quantity of electroplating wastewater are related to the process conditions of electroplating production, production load, operation management and water use methods and other factors. The water quality of electroplating wastewater i...

AI Technical Summary

Problems solved by technology

[0014] Physicochemical + biochemical methods are used for treatment. Since hypophosphite is used as a reducing agent in electroplating wastewater, it is difficult to effectively precipitate, resulting in the concentration of total phosphorus in the biochemical tail water is usually 2-5mg / L, and after precipitation with calcium salt, it usually contains High concentration of fluoride ions, the concentration range is 10-20mg / L, it is difficult to meet the increasingly stringent emission standards

[0015] The Ministry of Environmental Protection requires the electroplating industry to discharge in accordance with GB21900-2008 "Electroplating Pollutant Discharge Standard". Conventional treatment methods are used to treat electroplating wastewater with complex components. Level treatment, etc., so that the dosage of drugs is large, the process repeats to produce a lot of sludge, the cost is high, and it is difficult to ensure that the discharge of sewage meets the standard