Advanced treatment recovery technology of coking wastewater

A technology for advanced treatment and coking wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, general water supply conservation, etc., can solve the problem of ineffective biological aerated filter treatment and the production of reverse osmosis concentrate Large scale, non-standard wastewater treatment and other problems, to achieve continuous and stable operation, good cleaning effect, and reduce civil construction investment

Active Publication Date: 2014-09-10
SHANGHAI KAIXIN ISOLATION TECH CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

[0003] The main problems in my country's coking wastewater treatment are: some small coking plants have not yet built sewage treatment facilities; most coking plant wastewater treatment is not up to standard
However, there are still many problems in these projects using membrane technology. The main problems are: MBR membrane fouling is relatively serious, membrane flux declines relatively quickly, the treatment effect of biological aerated filter is not obvious, reverse osmosis membrane fouling is relatively serious, and chemical cleaning is relatively serious. Frequent, large output of reverse osmosis concentrate, easy to pollute the environment when discharged, etc.
Therefore, the use of aerobic effluent to enter the MBR membrane module will easily cause oil and organic matter to pollute the MBR membrane filaments, and it is not easy to clean
After pretreatment by ultrafiltration and other units, the CODc content of reverse osmosis influent water is still 100-150mg / L, which will cause serious pollution to the reverse osmosis membrane and frequent chemical cleaning.

Method used

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  • Advanced treatment recovery technology of coking wastewater
  • Advanced treatment recovery technology of coking wastewater
  • Advanced treatment recovery technology of coking wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 180L of biochemically treated coking wastewater from a steel plant. Pour 180L of waste water into the circulation tank of the ceramic membrane pilot equipment, start the circulation pump, and control the pressure at the entrance and exit of the membrane at 2.0 / 1.3kg / cm 2 , start filtering at room temperature. When the filtrate is 157.5L, the concentrated liquid reaches the lowest liquid level of the equipment, and the filtration is terminated. At this time, the concentration ratio reaches 8 times. Ceramic membrane filtrate 145L, into the reverse osmosis material tank, start the RO circulation pump, operating pressure 15 / 14kg / cm 2 , start filtering at room temperature. The filtrate 109L was collected. The water recovery rate is 75%.

[0052] The water quality test results are shown in Table 1:

[0053] Table 1

[0054]

Embodiment 2

[0056] The raw water of coking wastewater from a steel plant is degreased by air flotation, then hydrolyzed and acidified, and then enters the anaerobic pool, anoxic pool, and aerobic pool in sequence. The effluent from the biochemical aerobic tank is placed in the membrane water inlet tank, and the water is transported into the membrane system through the feeding image, and the wastewater is driven by the circulating pump to provide the surface flow rate of the membrane. The pressure in and out of the membrane is controlled at 2.0 / 1.3kg / cm2, and the filtration starts at room temperature. The concentrate is returned to the anoxic pool to control the reflux ratio to be 5. The filtrate is sent to the material tank of reverse osmosis, and the water is recovered. The water recovery rate is 75%.

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Abstract

An advanced treatment recovery technology of coking wastewater comprises the steps of sequentially implemented air floatation oil removal pretreatment, acidifying treatment, denitrification treatment and biodegradation treatment, and also comprises the following steps: 1, processing biodegraded wastewater by using an inorganic membrane filtering device, reusing parts of the obtained membrane filtrate as mineral separation process water, and allowing the residual membrane filtrate to enter a pollution resistant reverse osmosis membrane device to carry out desalination treatment; and 2, pumping the membrane filtrate obtained in step 1 into the pollution resistant reverse osmosis membrane device to carry out desalination treatment in order to remove COD, NH3-N and inorganic salts in water, and directly reusing the obtained membrane permeation liquid as circulating cooling water. The technology adopting an inorganic membrane to carry out the reverse osmosis pretreatment can solve the problems of no pollution resistance and unlikely dirt obstruction of an ultrafilter membrane, and no flocculating agent or a small amount of the flocculating agent is added by adopting inorganic membrane feeding, so the reverse osmosis pollution degree is reduced, thereby the cleaning period of the RO (reverse osmosis) membrane is prolonged, the cleaning effect is good, and the irreversible dirt obstruction of the RO membrane is avoided.

Description

technical field [0001] The invention relates to chemical production, in particular to an advanced treatment and recovery process of coking wastewater. Background technique [0002] Coking wastewater mainly comes from the high-temperature dry distillation of medium coal in coking production, gas purification and refining of chemical products, of which the residual ammonia water produced in the ammonia distillation process is the main source. The water quantity and water quality of coking wastewater vary depending on the scale of coking production, the gas purification process used and the depth of chemical product processing. However, the average amount of water is about 1.18 to 1.83 tons of waste water per ton of coke produced. The national annual discharge of coking wastewater is about 300 million tons. Coking wastewater has complex water quality and large volume, and is toxic, harmful, highly polluting and difficult to treat industrial wastewater. Being able to treat th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCY02A20/131
Inventor 申雅维齐唯葛文越
Owner SHANGHAI KAIXIN ISOLATION TECH CO LTD
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