仿酶生物处理杨木心材Bio-APMP制浆废水及回用

Treatment of Wastewater and Recycling from Bio-APMP Process of Poplar Heartwood by Biomimetic Degradation Combined with Biological Treatment

中文关键词:  Bio-APMP  厌氧废水处理  曝气生物滤池  仿酶处理  废水回用

Key Words:Bio-APMP  anaerobic wastewater treatment  BAF  biomimetic treatment  wastewater recycling

中文摘要:

      杨木心材碱性过氧化氢机械浆（APMP）的制浆废水不仅产生水量大，且化学需氧量（COD）较高，处理难度较大；通过白腐菌Trametes sp.48424预处理杨木心材，经碱性过氧化氢制浆得到生物处理APMP（Bio-APMP），可以有效降低制浆废水中的污染物含量，提高纸浆质量。本研究首先用内循环（IC）厌氧反应器对杨木心材Bio-APMP制浆废水进行厌氧生物处理，再利用仿酶-混凝与曝气生物滤池（BAF）相结合的组合工艺进行深度处理，探究厌氧和BAF处理的最佳工艺条件，以及仿酶络合物和絮凝剂的最佳用量。同时，研究了处理后制浆废水回用对Bio-APMP制浆性能的影响。研究结果表明，采用白腐菌生物预处理技术，Bio-APMP制浆废水的COD和木质素含量均低于传统APMP，制浆废水中的COD_Cr降低了15.3%。在最佳厌氧生物处理条件下，COD_Cr去除率为89.5%。此外，工艺优化后BAF的COD_Cr最高去除率为81.9%。Fe-EDTA仿酶络合物用量为15 mg/L时，仿酶-混凝法处理制浆废水效果最好，此时COD_Cr去除率为67.7%。利用厌氧+BAF+仿酶-混凝结合的方法深度处理Bio-APMP制浆废水，制浆废水的COD_Cr从11952 mg/L降至80.4 mg/L；将深度处理后的废水回用于Bio-APMP制浆过程，纸浆质量有所下降，纸张物理强度有所降低。

Abstract:

      The pulping wastewater from alkaline peroxide mechanical pulp （APMP） of poplar heartwood has not only a large quantity， but also 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） anaerobic 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 biomimetic complexes and flocculants were investigated. The effect of wastewater reuse on the performance of Bio-APMP pulping was also explored. 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 COD_Cr in the pulping wastewater was reduced by 15.3%. At the best anaerobic treatment condition， the removal rate of COD_Cr was 89.5%. The results also indicated that the highest removal rate of COD_Cr 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 COD_Cr reached 67.7%. By using a combination of anaerobic， BAF， biomimetic treatment， and coagulation for the advanced wastewater treatment， the COD_Cr 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.