Ethylene glycol industrial waste water treatment device and method for treating ethylene glycol industrial waste water

Abstract

The invention relates to the field of organic waste water treatment, and discloses an ethylene glycol industrial waste water treatment device and a method for treating ethylene glycol industrial wastewater. The ethylene glycol industrial waste water treatment device comprises a secondary adjusting control unit and a reaction and discharge unit, wherein the secondary adjusting control unit is usedfor adjusting the pH value of ethylene glycol industrial waste water and adding carbon source, nitrogen nutrient salt and phosphorus nutrient salt to obtain first waste water; the reaction and discharge unit comprises a feed pump, a circulating pump, an anoxic expansion bed reactor, an anoxic water outlet tank, a water outlet tank, a self-cleaning filter and a slag storage tank, and the reactionand discharge unit is used for carrying out denitrification reaction on the first waste water to obtain purified waste water; the anoxic expansion bed reactor comprises a main body, a water flow distributor and a three-phase separator which are arranged inside the main body, and the inside of the main body is divided into a water flow distribution area, an anoxic expansion bed reaction area and aseparated water outlet area from bottom to top in sequence. The device of the invention has low energy consumption, and can continuously treat the ethylene glycol industrial waste water containing high-concentration COD and NO3-N .

Description

technical field [0001] The invention relates to the field of organic wastewater treatment, in particular to an ethylene glycol industrial wastewater treatment device and a method for treating ethylene glycol industrial wastewater. Background technique [0002] Ethylene glycol (EG, commonly known as glycol) is an important bulk basic organic chemical raw material, which can be used to produce a variety of chemical products, such as polyester fiber, antifreeze, unsaturated polyester resin, lubricant, plasticizer, Non-ionic surfactants, explosives, coatings and inks, etc., have a wide range of applications. In China, ethylene glycol is mainly used as a raw material for polyester and antifreeze, of which polyester consumption accounts for more than 90%. In 2013, the domestic import volume of ethylene glycol was 8.25 million tons, and the import dependence was as high as about 70%, showing a huge market gap. In 2014, the new domestic polyester production capacity is expected to ...

AI Technical Summary

Problems solved by technology

This method has the following problems: the treatment process requires the COD concentration of the incoming water and the NO 3 -N is less than 1000mg / L and 100mg / L respectively, for high concentration of COD and high concentration of NO 3 -N wastewater cannot be treated

Moreover, during the operation function, a small amount of microbial fillers will gradually float from the inside of the reactor system to the liquid outlet of the reactor body, and a large amount of defilmed sludge will be washed out during this period. These floating fillers and washed out sludge are often blocked Circulating pumps need to be shut down frequently and backwashed to clean up the sludge, which brings great inconvenience to continuous production

[0005] In summary, in the current ethylene glycol industrial wastewater treatment, the electrolysis method has high energy consumption and needs to add a large amount of electrolyte, which will cause strong corrosion to the equipment and cause expensive treatment costs; wet oxidation method, chemical oxidation method and ozone method The initial investment and The operating cost is high; the reverse osmosis method is still in the small test stage, and the removal rate of ethylene glycol is low, and it cannot be applied to the treatment of ethylene glycol wastewater, and it is difficult to realize industrialization; the sequencing batch activated sludge method cannot handle high concentrations of COD and high concentrations of NO 3 -N waste water, frequent backwashing and problems with repairing or replacing pumps

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