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A kind of semi-coke wastewater multi-stage treatment process

A technology of blue carbon waste water and treatment process, applied in water/sewage multi-stage treatment, multi-stage water treatment, water/sewage treatment and other directions, can solve the problems of secondary pollution, complex process, restricted use, etc. Emission reuse, simple process steps, and the effect of avoiding waste

Active Publication Date: 2019-03-29
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many semi-coke enterprises adopt processes such as airtight oil separation and ammonia steaming to remove phenols for pretreatment, but it is still difficult for wastewater to meet the requirements of biochemical inflow after these physical and chemical pretreatments. General biochemical treatment methods cannot completely degrade organic matter in wastewater. The effluent cannot meet the standard
The treatment methods for semi-coke wastewater mainly include physical methods, chemical methods and biological methods. The main treatment methods include adsorption method, flue gas treatment method, activated sludge method, incineration method, catalytic oxidation-biochemical method, ammonia removal Phenol-SRB method, etc., but there are problems of high operating cost and poor operability
The cost of using activated carbon to adsorb and treat wastewater is high, and adsorption regeneration is difficult, so it is not suitable for high-concentration sewage treatment; the flue gas method requires that the amount of ammonia in the wastewater must be balanced with the amount of ammonia required by the flue gas, and its use is limited; activated sludge method, incineration The method and catalytic oxidation method have large investment and poor applicability; the ammonia distillation and dephenolization-SRB process needs to use chemical agents to remove phenols, resulting in secondary pollution
Although the single technology of semi-carbon wastewater treatment can achieve good results in the laboratory research stage, the solutions that can be used in industrial systems have yet to be explored, and the problems of high treatment costs and complicated processes in the existing technologies need to be improved.

Method used

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  • A kind of semi-coke wastewater multi-stage treatment process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Use semi-coke to produce raw coal as an adsorbent, and the content of -200 mesh is 82%. A blue charcoal wastewater, raw water COD is 28000-32000mg·L -1 , the content of ammonia nitrogen is 2000-3000mg·L -1 , the volatile phenol content is 4000-5000mg·L -1 ;After being treated by distilling ammonia and removing phenols, the COD is 7400-9600mg·L -1 , the content of ammonia nitrogen is 80-150mg·L -1 , the volatile phenol content is 240-350mg·L -1 ;Use the flotation column to remove oil, and the COD of the waste water after oil removal is 3700-5000mg·L -1 , the content of ammonia nitrogen is 80-150mg·L -1 , the volatile phenol content is 150-200mg·L -1 ; Coal powder adsorption pretreatment of waste water after oil removal, COD reduced to 1200-1700mg L -1 , the content of ammonia nitrogen is 80-150mg·L -1 , the volatile phenol content is 40-60mg·L -1 ; After biochemical treatment, COD is 85-150mg·L -1 , the content of ammonia nitrogen is 5-10mg·L -1 , t...

Embodiment 2

[0034] Example 2: Use blue charcoal powder as the adsorbent, the content of -200 mesh is 80%. A blue charcoal wastewater, raw water COD is 24000-30000mg·L -1 , the content of ammonia nitrogen is 2000-2500mg·L -1 , the volatile phenol content is 3000-3500mg·L -1 ;After being treated by distilling ammonia and removing phenols, the COD is 7000-9500mg·L -1 , the content of ammonia nitrogen is 80-125mg·L -1 , the volatile phenol content is 180-210mg·L -1; Use flotation column to remove oil, and the COD of waste water after oil removal is 3500-4500mg·L -1 , the content of ammonia nitrogen is 80-125mg·L -1 , the volatile phenol content is 100-150mg·L -1 ; Coal powder adsorption pretreatment of waste water after oil removal, COD reduced to 1000-1500mg L -1 , the content of ammonia nitrogen is 80-125mg·L -1 , the volatile phenol content is 30-50mg·L -1 ; After biochemical treatment, COD is 80-100mg·L -1 , the content of ammonia nitrogen is 5-8mg·L -1 , the volatile phenol co...

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Abstract

The invention discloses a semi-coke wastewater multi-level treatment technology, belonging to the purifying treatment on the wastewater produced in a semi-coke production process. The semi-coke wastewater multi-level treatment technology comprises the following steps: recycling ammonia and phenol from wastewater by ammonia distillation and dephenolizing processes; feeding the wastewater into a flotation column for flotation and recycling coal tar; leading the wastewater after coal tar removal into a stirring device; adding a regulator to adjust the pH value of the wastewater to be 2-4, and adding pulverized coal into the stirring device, wherein the concentration is 150-300g / L; stirring sufficiently; performing filter pressing of the coal-water mixed slurry with a neutral pH value to obtain filtrate and a dehydrated coal cake; treating the filtrate in a biochemical system; performing advanced treatment of the tail water after biochemical treatment by a pulverized coal adsorption method; conveying the treated coal-water mixed slurry to concentration equipment, and adding a regulator into the concentration equipment to facilitate sedimentation, wherein the obtained overflow is final effluent which enters a circulating water system; feeding the underflow into a press-filtering device to obtain filtrate and a dehydrated coal cake; and returning the filtrate to the concentration equipment. The coal cake obtained in the technological process is applied to combustion for power generation or heating, the pollutants are thoroughly decomposed, and zero-emission recycling of wastewater is realized.

Description

technical field [0001] The invention relates to an industrial waste water treatment process, in particular to a multi-stage treatment process for blue carbon waste water. Background technique [0002] Semi-coke is a relatively low volatile solid carbonaceous product obtained by medium-low temperature (600-800°C) dry distillation and pyrolysis of long-flame coal, non-caking coal or weakly caking coal. It is also called semi-coke. It is an important production raw material in coal chemical production. It has the characteristics of high fixed carbon, high specific resistance, and high chemical properties. It is widely used in industries such as calcium carbide, ferroalloy, fertilizer gas production, blast furnace injection, and civil clean briquette manufacturing. Semi-coke wastewater mainly comes from dust removal and washing water in the production process of semi-coke, condensed water in raw coal gas and residual ammonia water, etc. It has complex components, mainly containi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/001C02F1/048C02F1/283C02F1/40C02F1/52C02F1/66C02F3/00C02F9/00C02F2301/08
Inventor 王永田李小兵田全志边岳孙浩张义魏锦扬高丽慧文虹
Owner CHINA UNIV OF MINING & TECH