Pretreatment method of sucralose wastewater

Abstract

The invention relates to a pretreatment method of sucralose wastewater. The pretreatment method is characterized by comprising the following steps: (1) regulating the sucralose wastewater through a regulating tank, treating the sucralose wastewater through a coagulative precipitation tank and a wet catalytic oxidation device in sequence; (2) continuously feeding the wastewater into a coagulative precipitation tank, respectively adding a coagulant accounting for 0.02-0.04% of the weight of the wastewater and a coagulant aid accounting for 0.002-0.005% of the weight of the wastewater, controlling the pH value to be 6.5-7.5, reacting for 10-15 minutes, feeding the wastewater into the precipitation tank after the wastewater is discharged, and standing for 1.5-2.5 hours; (3) carrying out air floatation on a supernatant in the sedimentation tank, filtering and removing scum through quartz sand, enabling the wastewater to enter a membrane separation device, and enabling the formed inorganic high-salt wastewater and organic low-salt wastewater to respectively enter an MVR evaporator; and (4) enabling the evaporation condensate water to enter a biochemical system, and returning the inorganic high-salinity wastewater evaporation concentrated solution to the adjusting tank; and enabling the organic low-salt wastewater evaporation concentrated solution to enter an incineration device. Themethod has the advantages that the ammonium chloride salt with the content of more than 90% can be obtained and can be recycled; the COD of an effluent treated by a biochemical system is stabilized below 150mg / L; the membrane system can continuously and stably operate, and the cleaning frequency is reduced;.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a pretreatment method for sucralose production wastewater. [0002] technical background [0003] As a high-intensity sweetener, sucralose has the advantages of no energy, high sweetness, and high safety, and is currently one of the most ideal sweeteners. [0004] However, the wastewater produced during the production of sucralose is often high-concentration, high-salt, and refractory. Organic wastewater containing ring-like polymer pollutants is difficult to open and degrade. If the pretreatment cannot To achieve the effect will bring greater difficulty to the subsequent biochemical treatment, and even the effluent will not meet the standard. [0005] The existing better treatment technology is the pretreatment method of wet catalytic oxidation + membrane separation + MVR. Because the wastewater contains too much sugar, the efficiency of wet catalytic oxidat...

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Problems solved by technology

[0004] However, the wastewater produced during the production of sucralose is often high-concentration, high-salt, and refractory. Organic wastewater containing ring-like polymer pollutants is difficult to open and degrade. If the pretreatment cannot To achieve the effect, it will bring greater difficulty to the subsequent biochemical treatment, and even the effluent will not meet the standard

[0005] The existing better treatment technology is the pretreatment method of wet catalytic oxidation + membrane separation + MVR. Because the wastewater contains too much sugar, the efficiency of wet catalytic oxidation is 50%-60%. There is a lot of organic matter; the wastewater after wet oxidation treatment enters the membrane separation device to separate organic matter and inorganic salts, but due to the high content of organic matter and suspended matter SS in the wastewater, the continuous operation time of the membrane system is very short (short 2-3h, 3-5 days), the front-end filter element needs to be cleaned and replaced, and the cleaning of the filter element is very troublesome, which affects the continuous operation of the membrane system and the efficiency of the entire device; the wastewater after membrane separation enters the MVR device for evaporation and concentration, and the output The ammonium chloride salt still contains a large amount of organic matter, which makes the ammonium chloride salt dark in color and has many impurities. The cost of resource utilization is high, and the cost of hazardous waste disposal is higher

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