树脂吸附法处理酸析黑液废水的研究

Treatment of Wastewater of Acid-Precipitation Black Liquor with Resin Adsorption Process

采用树脂吸附法处理酸析黑液废水并回收木质素,考察了树脂吸附-脱附的影响因素,并优化了相关工艺参数。实验结果表明,在最佳工艺条件下,黑液经酸析-固定床吸附处理后,CODCr由72000 mg/L降至9000 mg/L,去除率为87.5%,木质素去除率达到98.0%,色度由16000倍降至8倍,去除率高达99.9%。酸析得到粗木质素,树脂吸附可分离回收较纯木质素。可生化性实验表明,经树脂吸附处理后废水的生物降解性能得到显著改善。该工艺操作简单,稳定可靠,运行成本低,在废水处理的同时实现了资源回收,且为后续生物处理创造了良好条件。

Resin adsorption process was adopted to treat acid-precipitation black liquor and recover the lignin dissolved in the wastewater. The factors influencing adsorption and desorption were investigated, and the process parameters were optimized. The experimental results showed that CODer of black liquor reduced from 72000 to 9000 mg/L with removal efficiency of 87. 5% through acid precipitation and fixedbed adsorption treatment under the optimal conditions. The removal rate of lignin was 98.0%, and the wastewater color became yellowy from 16000 dilution times with 99.9% removal rate. Crude lignin was obtained by acid precipitation and purer lignin could be separated and recovered through resin adsorption. The biodegradation experiments indicated the wastewater biodegradability was greatly improved after resin adsorption treatment. The proposed process is effective for the wastewater treatment, it can also recover the pollutant as resource, and the resulting effluent is more suitable for subsequent biodegradation as compared to the original wastewater.