粉煤灰作为吸附剂对提高造纸废水中污染物去除效率研究

打开文本图片集

中图分类号：X793 文献标识码：A DOI：10. 11980/j. issn. 0254-508X. 2025. 05. 022

Study on Enhancing the Removal Efficiency of Pollutants in Papermaking Wastewater Using Fly Ash as an Adsorbent

YUE Jinghua* DONG Wenze （Huanghe Jiaotong University，Jiaozuo，He’nan Province，454950） （*E-mail：jinghua1322301@126. com）

Abstract：This study investigated the adsorption performance of fly ash for pollutants in papermaking wastewater and analyzed the effects of various parameters，including the dosage of fly ash，initial COD concentration of the wastewater，adsorption time， pH value，and tempera‐ ture，on the adsorption of pollutants in papermaking wastewater. The results showed that when the dosage of fly ash was 2.0g/100mL ，the removal rates of various pollutants in the wastewater reached an optimal level. Further increases in the dosage resulted in a significantly di‐ minished enhancement in the removal efficiency of pollutants. As the initial CODCr concentration of the wastewater increased from 3000mg/L to 4000mg/L ，the removal rates of CODCr and chromaticity decreased by approximately 16.9% and 13. 8% ，respectively. The pH value of 6 was the most favorable for adsorption，achieving a CODCr removal rate of 58.6% . Both acidic and alkaline environments could reduce the COD removal efficiency. When the temperature increased from 20 ℃ to ，the CODCr removal rate improved by approximately 18. 9 per‐ centage points. Kinetic analysis showed that the adsorption process conformed to the pseudo-second-order model（ R2>0.99 ），with chemi‐ sorption being the dominant mechanism. The optimal adsorption conditions for fly ash were determined as follows：the dosage of fly ash was 2.0g/100mL ，the pH value was 6，the temperature was 60∘C ，and the adsorption time was 240min . Under these conditions，the removal rates of CODCr ，chromaticity， BOD5 ，and SS were 73.4% ， 78.6% ， 62.7% ，and 55.6% ，respectively.

Key words：fly ash；papermaking wastewater；pollutants；adsorption performance

造纸废水中含有大量的有机物、悬浮物和无机盐等污染物。（剩余8105字）