Tributyl phosphate extraction of high phenolic coking wastewater
extraction of high phenolic coking wastewater, after extraction of tributyl phosphate kerosene can be washed with lye recycling, but because the sodium phenolate recovery also need to invest in lye, and tributyl phosphate is not can use unlimited time, their use has a certain number of, a certain extraction effect, tributyl phosphate will need to be replaced.
reduce coking wastewater in coking plant of reflux, lower concentration of the pollutants in the coking wastewater, simple pretreatment, application of microorganism to deal with it. On the other hand, can one-time increase investment, and adopts steam dephenolizing tower for removal of the lye recycling ( Compared with the extraction solvent cleaning more clean and simple) 。 If extraction solvent cleaning fluid sodium phenolate easy to recycle and the economy, can continue to in coking wastewater using tributyl phosphate removal of phenol by extraction, using the reoccupy after fatigue to power plants burning method processing.
( 1) High phenol extraction dephenolizing pretreatment of coking wastewater experiments show that the temperature should be below 40 ℃, pH less than 8. 0, extraction ratio R is 1:2, the reaction time take 8 min, with 30% of the TBP extracting the original coking wastewater of kerosene, volatile phenol removal rate is as high as 96. 94%, the content of residual volatile phenol in water for 127. 62 mg/L, can satisfy the subsequent microbial processing. Extraction process of complexation reaction is reversible reaction, with 5% of sodium hydroxide with R = 1:1 cleaning, recycling of up to 94. More than 25%, the water remaining volatile phenol concentration of 371 mg/L, the generated sodium phenolate can use carbon dioxide or sulfuric acid acidification decomposition of phenol, implements the resource recycling.
( 2) Ammonia nitrogen removal and activated sludge domestication experiment shows that by studying the chemical precipitation and remove method, the coking wastewater in the NHS - N to remove the MAP method removal effect is much better than the blow off method. 1) Ammonia nitrogen concentration is as high as 3500 mg/L of the coking wastewater, through chemical precipitation after pretreatment, ammonia nitrogen concentration to 292 mg/L, ammonia nitrogen removal rate can reach 91. 66%. After extraction, the MAP precipitation except ammonia wastewater by 4 times dilution application anaerobic 48 h, 24 h after processing aerobic wastewater COD, volatile phenol, ammonia nitrogen removal rate reached 84 respectively. 85%, 51. 40%, 82. 91%.
( 3) Coagulation precipitation after the domestication of activated sludge wastewater experiments show that the polymeric ferric sulfate of coking wastewater treatment dosing quantity is less than polyaluminium chloride, and polymeric ferric sulfate of phenols and chromaticity of the treatment effect is better than that of polyaluminium chloride, and treatment effect is obvious. To the biological treatment of waste water per liter of water and 800 mg of PFS, its volatile phenol, ammonia nitrogen, COD, respectively by 27 mg/L, 35. 6 mg/L, 550 mg/L down to 15. 60mg/L,22. 72 mg/L, 153 mg/L, then through 2 g/L of powder activated carbon adsorption after 30 min wastewater COD, ammonia nitrogen, volatile phenol decreased to 84. 92mg/L, 0. 49mg/L, 16. 25 mg/L, and satisfies the requirement of wastewater reuse.
( 4) Using microorganism concentration was 4%, the concentration of 10% PVA freezing thawing fixed efficient XA05 phenol degradation bacteria, the temperature of 37 ℃, pH of 7. Five conditions, the speed of 150 r/min of constant temperature shock shaking bed degradation of phenol, the degradation rate slowed, with the increase of phenol concentration of phenol concentration below 957 mg/L after 36 h of degradation of the culture medium, the degradation efficiency can be up to 99. 44%, and the activation of PVA biological membrane in the treatment of wastewater containing phenol, the adaptability of temperature and pH is far better than that of free of bacteria. Continuous with the processing of phenol concentration of 0. 31 d 8 g/L of the culture medium, the degradation of phenol in more than 99%, and PVA dissolved in only a small number, does not affect its continued use. Application of PVA biological membrane extraction, precipitation MAP, diluted coking wastewater, due to high oil content in waste water, fixed method, the advantages of living cells.
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