Ethylene glycol industrial wastewater treatment device and method for treating ethylene glycol industrial wastewater

Abstract

The invention relates to the field of organic wastewater treatment, and discloses an ethylene glycol industrial wastewater treatment device and a method for treating the ethylene glycol industrial wastewater. The ethylene glycol industrial wastewater treatment device includes: a secondary adjustment control unit and a reaction and discharge unit; the secondary adjustment control unit is used to adjust the pH value of the ethylene glycol industrial wastewater, add carbon sources, nitrogen nutrients and phosphorus nutrients, The first waste water is obtained; the reaction and discharge unit includes a feed pump, a circulating pump, an anoxic expanded bed reactor, an anoxic water outlet tank, a water outlet, a self-cleaning filter and a slag storage tank, and the reaction and discharge unit is used for the first wastewater. The wastewater undergoes denitrification reaction to obtain purified wastewater; the anoxic expanded bed reactor includes a main body, a water flow distributor and a three-phase separator arranged inside the main body, and the inside of the main body is divided into a water flow distribution area, anoxic Expanded bed reaction zone and separated effluent zone. The device of the invention has low energy consumption, and can continuously process high-concentration COD and NO 3 ‑N ethylene glycol industrial wastewater.

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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