Energy-saving deep treatment system and method for non-biodegradable organic wastewater

Abstract

The invention relates to an energy-saving deep treatment system and method for non-biodegradable organic wastewater. The system comprises an forward osmosis (FO) membrane concentration device and a multi-effect evaporator, wherein the forward osmosis membrane concentration device comprises FO membrane airtight exchange tanks, an absorbing solution recycling device and a clean water recovering device, at least one stage of FO membrane airtight exchange tank is arranged, the absorbing solution recycling device is respectively connected with each stage of FO membrane airtight exchange tank by virtue of an electrically operated valve, the clean water recovering device is connected with the absorbing solution recycling device, all stages of FO membrane airtight exchange tank are sequentially connected by virtue of solution-discharge electrically operated valves and are connected with a mother solution incinerator by virtue of a Chaoyue electrically operated valve. According to the system, based on the high osmotic pressure characteristic of non-biodegradable organic wastewater, by preparing the absorbing solution with relatively high colligative property and using the osmotic pressure difference caused by the colligative property difference of the solution, the non-biodegradable organic wastewater can be efficiently concentrated and meanwhile the water resource is recycled so as to produce electric energy; the automatic interlocking control of the running operation is achieved and the running mode can be adjusted according to different incoming water conditions.

Description

technical field [0001] The invention relates to an advanced treatment system for refractory organic wastewater and a treatment method thereof, belonging to the technical field of advanced wastewater treatment. Background technique [0002] Water pollution is one of the major environmental problems facing our country. According to statistics, industrial wastewater accounts for more than 70% of the total sewage volume, and most of industrial wastewater is high-concentration organic wastewater. High-concentration organic wastewater mainly comes from wastewater with a COD concentration of more than 2000mg / L discharged from papermaking, leather, food, and chemical industries. The polluted water containing refractory organic compounds in organic wastewater is called refractory organic wastewater. It usually refers to organic matter that cannot be decomposed quickly or incompletely under microorganisms or specific conditions. The existing forms of such pollutants are always enric...

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Problems solved by technology

[0010] Chinese patent document CN102381812A discloses " a kind of utilization 3 Catalytic Oxidation Advanced Treatment Method and Device for Refractory Biodegradable Organic Wastewater", CN103539296A Disclosed "Method and Device for Treating High Concentration Refractory Organic Wastewater" and CN1264761C Disclosed "Refractory Biodegradable Organic Wastewater Treatment Method and Device", The process is complicated, the cost is high, and the treatment effect needs to be improved

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