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III.AEROBIC BIOLOGICAL AND COAGULATION TREATMENTS OF HIGH YIELD PULPING EFFLUENT

Caf Nanjing

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Abstract

Two processes(Aeration lagoon and Activated sludge)were used to treat effluent from BCMPand BCTMP waste water of fir,spruce and poplar and their purification efficiencv were tested.The resultsshow that:a)aerobic biological process is favour to this type of waste water;b)for waste water with CODlevel of 1～2 kg COD/m￣3·d under the batch process(after 32 h aeration),64.7% COD_(cr) was removed frompoplar BCMP effluent and 53.0% COD_(cr) removed from fir BCMP effluent; under continuous process,67%～80%COD_(cr) removed from spruce effluent and 73%～87%COD_(cr) removed from poplar effluent,97%～99%BOD_7 removed from both spruce and poplar effluent;c)whole system was stable and easy for regula-tion.

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What this paper is about

Two processes(Aeration lagoon and Activated sludge)were used to treat effluent from BCMPand BCTMP waste water of fir,spruce and poplar and their purification efficiencv were tested.The resultsshow that:a)aerobic biological process is favour to this type of waste water;b)for waste water with CODlevel of 1～2 kg COD/m￣3·d under the batch process(after 32 h aeration),64.7% COD_(cr) was removed frompoplar BCMP effluent and 53.0% COD_(cr) removed from fir BCMP effluent; under continuous process,67%～80%COD_(cr) removed from spruce effluent and 73%～87%COD_(cr) removed from poplar effluent,97%～99%BOD_7 removed from both spruce and poplar effluent;c)whole system was stable and easy for regula-tion.

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Available abstract

Two processes(Aeration lagoon and Activated sludge)were used to treat effluent from BCMPand BCTMP waste water of fir,spruce and poplar and their purification efficiencv were tested.The resultsshow that:a)aerobic biological process is favour to this type of waste water;b)for waste water with CODlevel of 1～2 kg COD/m￣3·d under the batch process(after 32 h aeration),64.7% COD_(cr) was removed frompoplar BCMP effluent and 53.0% COD_(cr) removed from fir BCMP effluent; under continuous process,67%～80%COD_(cr) removed from spruce effluent and 73%～87%COD_(cr) removed from poplar effluent,97%～99%BOD_7 removed from both spruce and poplar effluent;c)whole system was stable and easy for regula-tion.

Key concepts: Effluent, Chemistry, Aeration, Pulp and paper industry, Wastewater, Wastewater quality indicators, Activated sludge, Chemical oxygen demand

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