Method and device for treating high-salt organic wastewater in chemical production

Abstract

The invention relates to the technical field of environmental protection, and particularly discloses a method and a device for treating high-salt organic wastewater in chemical production. The method comprises the following steps: (a) salt washing; (b) salt dissolving; (c) treatment via a nanofiltration membrane; (d) catalytic oxidation treatment; (e) phosphorus removal and flocculation; (f) settling: (f1) feeding saline water into a first settling cylinder; (f2) feeding saline water in a first settling cylinder into a first double-layer filter cylinder; (f3) feeding the saline water in the first double-layer filter cylinder into a second settling cylinder; (f4) feeding the saline water in the second settling cylinder into a second double-layer filter cylinder; (f5) feeding the saline water in the second double-layer filter cylinder into a purification cylinder; and (g) adsorption: (g1) feeding the saline water in the purification cylinder into a first adsorption cylinder; (g2) starting a pressurizing device on a liquid inlet pipeline of the first adsorption cylinder; (g3) starting a pressure reducing device on a liquid inlet pipeline of the second adsorption cylinder; and (g4) feeding the saline water into a refined brine storage tank. The device and the method invention have the characteristics of better settling separation effect, shorter adsorption time and better adsorption effect.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method and device for treating high-salt organic wastewater in chemical production. Background technique [0002] With the increasingly stringent environmental protection policies and the improvement of discharge standards, the requirements for industrial wastewater treatment technology are also getting higher and higher. Especially for high-salt organic wastewater as hazardous waste, the salt content of raw water is between 1.5 and 3%, COD is 5000-10000mg / L, ammonia nitrogen is above 200mg / L, up to 1000mg / L, and total phosphorus is 100mg / L. More than L, up to 1000mg / L, in addition, it also contains a certain amount of copper, nickel and other strictly controlled pollutants. This type of wastewater has high salinity and COD concentration, and is a refractory industrial wastewater. Special technical means are required to ensure that the effluent is discharged u...

AI Technical Summary

Problems solved by technology

However, the settling step wherein simply adopts the mode of static settling, and the settling separation effect is relatively poor; the adsorption step wherein is simply adsorbed with an adsorbent, and the adsorption time is longer, and the adsorption effect is relatively poor.

[0006] Therefore, the existing treatment of high-salt organic wastewater has the problems of poor sedimentation and separation effect, long adsorption time and poor adsorption effect.

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