酚醛缩合-铁碳微电解预处理高含酚工业废水

Pretreatment of Industrial Wastewater Containing High Concentration Phenol by Phenol-formaldehyde Condensation and Ferric Carbon Micro Electrolysis

采用酚醛缩合-铁炭微电解联合工艺预处理高含酚废水。考察了反应时间、酸催化剂用量、甲醛用量对酚醛缩合反应的影响,以及pH值、反应时间等对铁碳微电解的影响。结果表明:在80℃下,以2%废水量的盐酸为催化剂,加入15%废水量的甲醛反应5 h,废水中酚质量浓度由13 850 mg/L降至980 mg/L。在pH值为2时,铁碳微电解120min,酚质量浓度可继续降至48 mg/L。酚的总去除率为99.7%,达到企业相关要求。

The combined process, phenol-formaldehyde condensation and ferric carbon micro electrolysis was used to pretreat wastewater containing high concentration phenol. The effects of reaction time, amount of acid catalysis and amount of formaldehyde on the phenol-formaldehyde condensation reaction, and the influence of pH value and reaction time on ferric carbon micro electrolysis were investigated. The results showed adding 2% of the wastewater amount of hydrochloric acid as catalyst, adding 15% of the wastewater amount of formaldehyde at 80℃ for 5 hours, the amount of phenol in wastewater decreased from 13 850 mg/L to 980 mg/L. When pH was 2 and the reaction time was 120 min, the phenol content continued to fall to 48 mg/L by ferric carbon micro electrolysis. The total removal rate of phenol was 99.7%.