High-cyanide-content wastewater treatment system and treatment method

Abstract

The invention discloses a high-cyanide-content wastewater treatment system and a treatment method. The high-cyanide-content wastewater treatment system comprises a reaction kettle, a deamination tower, an absorption apparatus and a water storage tank. The high-cyanide-content wastewater treatment method comprises the steps that firstly, sodium cyanide containing wastewater is collected to the reaction kettle, the temperature in the reaction kettle is kept to 155-160 DEG C, and the pressure is kept 0.5-0.6 Mpa, so that sodium cyanide is hydrolyzed into ammonia gas and sodium formate; then, the pressure in the reaction kettle is relieved to normal pressure, a hydrolysate is led to the deamination tower, a fan of the deamination tower is started to blow ammonia gas; the removed ammonia gas is led to a dilute sulphuric acid containing absorption apparatus from a gas outlet of the deamination tower, and the ammonia gas reacts with dilute sulphuric acid to generate ammonium sulfate; the liquid subjected to deamination is led to the water storage tank from a liquid outlet of the deamination tower and finally is discharged into a sewage treatment process from the water storage tank. The high-cyanide-content wastewater treatment system has the advantages that the raw material inputting amount is small, the cost is low, the operation is simple, and a treatment effect is good; the generated ammonium sulfate can serves as a chemical fertilizer, and the system is environmentally friendly and saves resources.

Description

technical field [0001] The invention relates to a sewage treatment system and a treatment method, in particular to a high-cyanide wastewater treatment system and a treatment method. Background technique [0002] High-concentration sodium cyanide-containing wastewater requires complex environmental protection processes, a large investment in equipment, and high treatment costs. Among the commonly used treatment methods, the use of ferrous sulfate to break cyanide will produce a large amount of solid waste containing cyanide; the use of alkaline chlorination to break cyanide will cause excessive chloride ions in the effluent, which will bring difficulties to the next biochemical treatment; use hydrogen peroxide Oxidative cyanide breaking has higher input costs. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an environment-friendly and economical high-cyanide wastewater treatment system and treatment method. [0...

AI Technical Summary

Problems solved by technology

[0002] High-concentration sodium cyanide-containing wastewater requires complex processes for environmental protection treatment, a large investment of equipment, and high treatment costs

Among the commonly used treatment methods, the use of ferrous sulfate to break cyanide will produce a large amount of solid waste containing cyanide; the use of alkaline chlorination to break cyanide will cause excessive chloride ions in the effluent, which will bring difficulties to the next biochemical treatment; use hydrogen peroxide Oxidation and breaking of cyanide have higher input costs

Images