铁碳微电解深度处理煤制气废水的条件优化

Optimization for conditions of advanced treatment of coal gasification wastewater by iron-carbon micro-electrolysis

采用铁碳微电解对煤制气项目生化处理后的废水进行深度处理。分别考察了静态实验条件下废水的初始p H值、反应时间、铁碳微电解一体化填料的类型及投加量对微电解反应效果的影响。经过实验筛选出最佳的铁碳微电解填料为Poten-ICME05及p H值为3.01、投加量80 g/L及反应时间为60 min是最佳反应条件。在此条件下,废水CODCr从初始的133.6 mg/L降到27.0 mg/L,去除率为79.79%;废水浊度由初始的0.63 NTU降到0.29 NTU,去除率为53.97%;废水色度由初始的260倍降到10倍,去除率为96.15%;BOD5/CODCr由初始的0.166提高到0.353,废水的可生化性得到较好的改善。经处理后出水水质主要指标完全可以达到地方排放标准CODCr≤40 mg/L。结果表明:Poten-ICME05是一种性能良好的微电解一体化填料,对去除废水中CODCr、浊度、色度等的效果最好,能有效地应用于煤制气废水的深度处理。

The iron-carbon micro-electrolysis process was used to treat goal gasification wastewater. The influences of initial p H value,reaction time,iron-carbon catalyst dosage and types on the treatment effect were investigated.The results show that Poten-ICME05 can exhibit higher CODCr,turbidity and chromaticity removal performance.The experimental factors were optimized. When the initial p H value was 3. 01,the Poten-ICME05 dosage was 80 g / L,and the reaction time was 60 min,the concentration of CODCrin the wastewater after the treatment decreased from 133. 6 mg / L to 27. 0 mg / L,and the removal efficiency of CODCrwas 79. 79%; the turbidity of wastewater decreased from 0. 63 NTU to 0. 29 NTU,and the corresponding removal efficiency was 53. 97%; the chromaticity decreased from 260 to 10 unit,and the removal of chromaticity was 96. 15%; the biodegradability of the effluent was improved by increasing the ratio of BOD5/ CODCrfrom 0. 166 to 0. 353. The wastewater treated could meet the local drainage standard of CODCr≤40 mg /L. Thus,the Poten-ICME05 is a micro-electrolysis integration with a good performance on removal of CODCr,turbidity and chromaticity,which can be effectively used for advanced treatment of coal gasification wastewater.