Energy-saving coal chemical engineering wastewater deep treatment system and treatment method thereof

Abstract

The invention discloses an energy-saving coal chemical engineering wastewater deep treatment system and a treatment method thereof. The system comprises a forward osmosis (FO) membrane concentration device and a multi-effect evaporator, wherein the FO membrane concentration device comprises one or more stages of airtight FO membrane exchange boxes, a sucked solution recycling device and a clear water recovering device; the sucked solution recycling device is connected with the stages of airtight FO membrane exchange boxes through electrical valves respectively; the clear water recovering device is connected with the sucked solution recycling device; the stages of airtight FO membrane exchange boxes are connected through liquid discharge electrical valves in sequence and connected with a mother liquid incineration furnace through overrunning electrical valves. The method is characterized in that for high osmotic pressure characteristic of coal chemical engineering wastewater, water resources are recycled while the coal chemical engineering wastewater is efficiently concentrated to generate electrical energy by preparing a sucked solution with relatively good colligative properties and utilizing osmotic pressure difference caused by colligative property difference of the solution; the automatic interlocking control is realized in a running process and the running mode can be adjusted according to different water feeding conditions.

Description

Technical field [0001] The invention relates to an advanced treatment system and method for coal chemical wastewater, and belongs to the technical field of wastewater treatment. Background technique [0002] The so-called coal chemical industry is an industry that converts coal into gas, liquid, and solid fuels and produces various chemical chemicals through a series of chemical process reactions. [0003] my country's coal-rich, oil-poor, and low-gas energy structure determines the rapid development of the coal chemical industry, especially the new coal chemical industry. Traditional coal chemical industry generally refers to coal gasification, liquefaction, coking and tar processing, calcium carbide acetylene chemical industry, etc. It also includes the production of carbon materials and coal-based polymer materials from coal. The new coal chemical industry is led by coal gasification, including coal-based methanol, acetic acid, and dimethyl ether. The rapid development of the ...

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Problems solved by technology

However, it is not difficult to find that some methods are limited in their applicability due to their own disadvantages.

For example: the physical method does not completely degrade the pollutants, but only transfers them from one phase to another; the chemical method requires a large amount of chemical agents, which makes the operation cost high and it is difficult to promote on a large scale. secondary pollution

Biological treatment is relatively cheap and is currently widely used as a water treatment method. However, its limitations are: 1) slow degradation rate; 2) strong selectivity of bacterial action; 3) incomplete degradation may form Toxic intermediate products; 4) Some aromatic compounds are difficult to be degraded

AogatePR research pointed out that the treatment effect of some

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