System for efficiently treating acrylonitrile wastewater and combined process thereof

Abstract

The invention discloses a system for efficiently treating acrylonitrile wastewater and a combined process thereof, and belongs to the technical field of industrial wastewater treatment. The system comprises a primary circulation type air flotation column, a secondary circulation type air flotation column, a high-efficiency electrolytic tank, a chemical tank, a water inlet tank, a hydrolysis acidification tank, an anaerobic fixed membrane reactor and a photobiology-fixed bed integrated reactor; wherein the primary circulation type air flotation column and the secondary circulation type air flotation column are both communicated with the chemical tank, and the chemical tank is communicated with the water inlet tank; the water inlet tank is communicated with a water inlet of the first-stage circulation type air flotation column through a lifting pump, the bottom of the first-stage circulation type air flotation column is communicated with the middle water tank through a low-shear circulating pump, the middle water tank is communicated with a water inlet of the second-stage circulation type air flotation column, and the bottom of the second-stage circulation type air flotation column is communicated with the efficient electrolytic tank. According to the combined process, the acrylonitrile and other refractory substances in acrylonitrile wastewater can be efficiently removed, the energy consumption is low, and the sludge yield is low.

Description

technical field [0001] The invention relates to a system for efficiently treating acrylonitrile wastewater and a combined process thereof, belonging to the technical field of industrial wastewater treatment. Background technique [0002] Acrylonitrile is a raw material for synthetic fiber, rubber, resin and other high molecular organic matter. The main components of acrylonitrile sewage are organic pollutants such as acrylonitrile, acetonitrile, cyanide, heterocyclic nitrogen compounds and inorganic pollutants, which are toxic, biodegradable and environmentally harmful. Therefore, if the wastewater is directly discharged without proper treatment, it may cause serious environmental pollution and health risks. [0003] At present, the methods for the treatment of acrylonitrile wastewater mainly include incineration, advanced oxidation, membrane separation technology, biological treatment technology and so on. The incineration method is simple to operate, but the treatment co...

AI Technical Summary

Problems solved by technology

The utility model patent "Acrylonitrile Wastewater Treatment Device" CN 205473157U uses a three-effect downstream evaporation and crystallization device to remove polymers, but the energy consumption is high and the cost is high, and the removal of nitrogen and phosphorus in acrylonitrile wastewater is not mentioned

Although acrylonitrile oligomers can be separated from wastewater by collectors, they remain suspended in the froth and are difficult to remove

Images