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Pretreatment method of coal middle-low temperature dry distillation wastewater
Inactive Publication Date: 2018-04-06
BEIJING CYCLE COLUMBUS ENVIRONMENTAL TECH RES INST CO LTD
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[0003] Patent CN205368013U discloses a semi-coke wastewater pretreatment device, which includes gravity oil separation, dissolved air flotation, filtration, dephenolization and ammonium cyanide separator. Emulsified oil removal measures, while putting air flotation in front of dephenolation will oxidize phenols to quinones with poor biodegradability
[0004] Patent CN20621
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Embodiment 1
[0027] The wastewater from a coal medium-temperature dry distillation enterprise, the main indicators of water quality are: COD 20000mg / L, total phenols: 4000mg / L, oil: 1000mg / L, NH 4 -N 2000mg / L, CO 2 1500mg / L,H 2 S 100mg / L, pH 8.1.
[0028] The waste water treatment process is as follows: the waste water stays in the gravity degreasing tank for 4 hours, the heavy oil in the oil collecting hopper at the bottom of the degreasing tank is indirectly heated by steam, and the heating temperature of the discharged oil is above 70°C, after the gravity degreasing, the waste water enters the ceramic membrane filter for filtration and degreasing. In addition to coal ash and a part of suspended oil, the ceramic membrane is backwashed by mixing steam and filtered water. After gravity degreasing and ceramic membrane filtered water, the oil content can be reduced to less than 150mg / L. The effluent enters the deacidification and deamination unit, using double towers Acid deamination, adj...
Embodiment 2
[0031] The wastewater from a coal medium-temperature dry distillation enterprise, the main indicators of water quality are: COD 32000mg / L, total phenols: 7000mg / L, oil: 1500mg / L, NH 4 -N 2500mg / L, CO 2 2500mg / L, H 2 S 120mg / L, pH 8.3.
[0032]The waste water treatment process is as follows: the waste water stays in the gravity degreasing tank for 4 hours, the heavy oil in the oil collecting hopper at the bottom of the degreasing tank is indirectly heated by steam, and the heating temperature of the discharged oil is above 70°C, after the gravity degreasing, the waste water enters the ceramic membrane filter for filtration and degreasing. In addition to coal ash and a part of suspended oil, the ceramic membrane is backwashed by mixing steam and filtered water. After gravity degreasing and ceramic membrane filtered water, the oil content can be reduced to less than 150mg / L. The effluent enters the deacidification and deamination unit, using double towers Acid deamination, the...
Embodiment 3
[0035] The wastewater from a coal low-temperature dry distillation enterprise, the main indicators of water quality are: COD 52000mg / L, total phenols: 12000mg / L, oil: 1800mg / L, NH 4 -N 3000mg / L, CO 2 3500mg / L, H 2 S 150mg / L, pH 8.5.
[0036] The wastewater treatment process is as follows: the wastewater stays in the gravity degreasing tank for 5 hours, and the heavy oil in the oil collecting hopper at the bottom of the degreasing tank is indirectly heated by steam, and the heating temperature of the discharged oil is above 70°C. After gravity degreasing, the wastewater enters the ceramic membrane filter for filtration In addition to coal ash and a part of suspended oil, the ceramic membrane is backwashed by mixing steam and filtered water. After gravity degreasing and ceramic membrane filtered water, the oil content can be reduced to less than 200mg / L. The effluent enters the deacidification and deamination unit, using double towers Acid deamination, the pH of the wastewate...
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Abstract
The invention discloses a pretreatment method of coal middle-low temperature dry distillation wastewater. The method comprises the steps of firstly eliminating heavy oil and suspended oil by filteringthe wastewater through a gravity oil-removal tank and a ceramic film; eliminating emulsified oil and suspended substances through extraction, dephenolization, demulsification and air flotation; further adjusting pH after improving biodegradability through Fenton oxidation, and therefore final water-out oil content, ammonia, phenol and biodegradability after the processing reaching the requirements of biochemical water is guaranteed. The method specifically eliminates floated oil, the heavy oil, the suspended oil and the emulsified oil step by step, guarantees that the final water-out oil content, ammonia, phenol and biodegradability after the processing reach the requirements of the biochemical water, and on the basis of the above, by means of optimization combination of each unit of eliminating the oil, stilling the ammonia, dephenolizing and improving the biodegradability of the wastewater of the processing, achieves high-efficient recycle of tar, the ammonia and the phenol in the wastewater, improves the biodegradability of the wastewater, can guarantee stability of a follow-up biochemical system, and has a good application prospect.
Description
technical field [0001] The invention relates to the field of advanced treatment of industrial wastewater, in particular to a pretreatment method for low-temperature dry distillation wastewater in coal. Background technique [0002] Medium and low-temperature coal dry distillation technology for coal uses low-rank coal as raw material and dry distillation at 600-800°C to obtain semi-coke, tar and gas products. The waste water produced by it is similar to coking waste water, but due to the type of coal used and The process is different, and the wastewater produced is also different from coking wastewater. The treatment methods include pretreatment, biochemical treatment and advanced treatment. Pretreatment is mainly used to remove substances harmful to the biochemical system. The main pollutants are acid gases such as carbon dioxide and hydrogen sulfide. , tar, coal ash, phenol and ammonia, and the biodegradability of wastewater is low, so it is necessary to add measures to im...
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