Treatment of Wastewater and Recycling from Bio-APMP Process of Poplar Heartwood by Biomimetic Degradation Combined with Biological Treatment
The pulping wastewater from alkaline peroxide mechanical pulp(APMP)of poplar heartwood has not only a large quantity,but al-so high COD,making it difficult to treat.The white rot fungus Trametes sp.48424 was used to pretreat poplar heartwood,and bioprocessed APMP(Bio-APMP)was obtained by alkaline hydrogen peroxide pulping,which could effectively reduce the content of pollutants in pulping wastewater and improve pulp quality.In this study,the anaerobic biological treatment was carried out with an internal circulation(IC)anaer-obic reactor firstly,following by a combination of biological aerated filter(BAF)and biomimetic coagulation for advanced treatment of poplar heartwood Bio-APMP pulping wastewater.The optimum conditions for anaerobic and BAF treatment,as well as the optimum dosage of biomi-metic complexes and flocculants were investigated.The effect of wastewater reuse on the performance of Bio-APMP pulping was also ex-plored.The results showed that when the biotechnology of white-rot fungus pretreatment was applied,the COD and lignin content of Bio-APMP pulping wastewater were lower than that of traditional APMP,and the CODCr in the pulping wastewater was reduced by 15.3%.At the best anaerobic treatment condition,the removal rate of CODCr was 89.5%.The results also indicated that the highest removal rate of CODCr in the BAF after process optimizing was 81.9%.When the dosage of Fe-EDTA biomimetic complex was 15 mg/L,the biomimetic coagulation had the best effect on pulping wastewater treatment,and the removal rate of CODCr reached 67.7%.By using a combination of anaerobic,BAF,biomimetic treatment,and coagulation for the advanced wastewater treatment,the CODCr of Bio-APMP pulping wastewater was reduced from 11952 mg/L to 80.4 mg/L.By reusing the wastewater after advanced treatment into Bio-APMP pulping process,the quality of the pulp was decreased and the physical strength of the paper was reduced.
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