Treatment of High Consistency Effluent from Bamboo CTMP Pocess with a Multi-bio-stages Sequence

摘要

The characteristics of effluent from Bamboo CTMP pulping process were investigated.The results showed that this type of effluents,compared with that from wood pulping process,had the following characteristics: 1)higher consistency of COD; 2)higher contents of nitrogen(ammonia).The loading of COD was 7320 mg/l,the content of nitrogen (ammonia)was higher than 500 mg/l.Combinations of anaerobic and aerobic bio-reactors were applied to investigate the efficiency of effluents removal.This treatment system could be organized into four stages,i.e.,flocculation,anaerobic,aerobic and post-flocculation stages.The results show that,in the first stage,while using PSAFCS No.2 with a dosage of 2000 mg/l,the removing ratios of COD,BOD5 and SS can be reach up to about 49.4%,46.4% and 71.1%; in the anaerobic processing stage,those of COD,BOD,SS reach up to about 85.4%,86.8% and 60.1%; in the aeration stage,those of COD,BOD,SS reach about 68.4%,84.5%,52.5%,respectively.The discharged water could meet the local effluent discharging standard,the values of COD,BOD,SS and color have been significantly brought down to 172 mg/l,27mg/l,72 mg/l and 150 times,respectively.This multi-bio-stages sequence may become a suitable method for the treatment of high consistency effluent from Bamboo CTMP process economically.