Technique for processing coking wastewater or organic wastewater by supercritical water oxidization technique

Abstract

The invention relates to a process by adopting supercritical water oxidation technology to treat coking wastewater or organic wastewater. The invention is that: coking wastewater or organic wastewater is pretreated to obtain wastewater without solid granules; the wastewater is heated to 380-450 DEG C with a first interchanger and / or a supercritical boiler, and then enters demineralizing equipment to remove the salt in the wastewater by taking advantage of the property that supercritical inorganic matter is indissoluble; the wastewater after desalting is put in a reaction kettle to generate autothermal reaction with an heated and pressurized oxidant to obtain high-temperature gas-liquid mixture with higher temperature; the high-temperature gas-liquid mixture enters the first interchanger and acts as thermal medium to exchange heat with new coming coking wastewater or organic wastewater and then goes through a secondary interchanger to enter a cooler and is cooled to normal temperature, after pressure thereof is adjusted by a pressure regulation device, the high-temperature gas-liquid mixture enters a gas-liquid separator for separation, and then the air is discharged, while the liquid, namely the treated water is recycled. The organic contamination and oxidant are all dissolved in the wastewater; oxidation reaction is generated in homogeneous phase, in short reaction time, oxygenolysis of organic contamination is carried out quickly.

Description

technical field [0001] The invention relates to a sewage treatment process, for example, a new technology for coking wastewater and other organic wastewater treatment, in particular a supercritical water oxidation technology for coking wastewater or organic wastewater treatment. Background technique [0002] my country's coke industry has developed extremely rapidly. By the end of last year, there were more than 15,000 coking plants, and the coke production capacity was close to 300 million tons. However, the number of small and medium-sized independent coking enterprises accounts for more than 80% of the total number of coking enterprises, and the production capacity accounts for about 35%. The scale of the enterprise is small, the layout is extremely unreasonable, and the problems of environmental protection are prominent. Harmful pollutants such as waste water and waste gas discharged from coke production seriously pollute the environment and threaten the health of the pe...

AI Technical Summary

Problems solved by technology

The process is complicated, covers a large area, and has high investment and operating costs. At present, the investment for denitrification of general coking wastewater is 150,000-200,000 yuan / ton of water, and the operating cost is 5-6 yuan / ton of water. 100-150m 2 / ton of water

[0004] In order to solve this problem, a lot of research has been done on biochemical methods from the aspects of microorganisms, process flow and reactors. However, as far as the national situation is concerned, there are still quite a few enterprises that cannot meet the requirements of national or local environmental protection standards.

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