Energy-saving fine chemical wastewater deep treatment system and treatment method

Abstract

The invention relates to an energy-saving fine chemical wastewater treatment system and treatment method. The system comprises a forward osmosis membrane concentration device and a multi-effect evaporator, wherein the forward osmosis membrane concentration device comprises FO membrane closed exchange boxes, a drawn liquid recycling device and a clear water recovery device, at least one stage of FO membrane closed exchange box is arranged, the drawn liquid recycling device is connected with each stage of the FO membrane closed exchange box through an electric valve respectively, the clear water recovery device is connected with the drawn liquid recycling device, and all the stages of FO membrane closed exchange boxes are sequentially connected through liquid discharge electric valves and connected with a mother liquid incineration furnace through overtaking electric valves. The method is designed against high osmotic pressure property of fine chemical wastewater, and by preparing drawn liquid with relatively high colligative property and utilizing the osmotic pressure difference caused by differences in colligative property of a solution, the fine chemical wastewater can be efficiently concentrated, water resources can be simultaneously recycled, and electric energy is produced; and the operation process realizes automatic interlocking control, and the operation way can be adjusted according to different water inlet conditions.

Description

technical field [0001] The invention relates to an advanced treatment system for fine chemical wastewater and a treatment method thereof, belonging to the technical field of advanced wastewater treatment. Background technique [0002] China refers to the industry that produces fine chemicals as fine chemical industry, referred to as fine chemical industry, including dyes, paints, medicines, chemical fibers and pesticides. According to statistics, there are currently 25 categories of fine chemicals in my country, with more than 30,000 varieties. , the production capacity of fine chemical products is nearly 13500kt / a, and the annual output is about 9700kt. With the rapid development of my country's economy, fine chemical products are more and more widely used in the national economy and people's lives. [0003] The fine chemical production process is different from the general chemical (general chemical) production. It consists of three parts: chemical synthesis (or separation...

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Problems solved by technology

[0007] Chinese patent document CN103159381A discloses "a fine chemical wastewater treatment and reuse method" and CN103896457A discloses "a fine chemical wastewater treatment process", the treatment cost is high, and the treatment effect needs to be improved

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