AN IMPROVED COMPOSITION FOR TREATMENT OF EFFLUENTS FROM PAPER AND PULP INDUSTRY AND THE PROCESS THEREOF

摘要

The pulp and paper industry in India is one of the highly polluting industries. Paper industries in India face problems in the area of environmental management particularly because of low scale of operation, various and mixed raw materials inputs and lack of adequate modernization in the paper manufacturing as well as effluent treatment. The industry uses on an average 250-300 m3 of fresh water per ton of paper produced arid nearly 75% of which is discharged as effluent popularly known as black liquor. It contains organic and inorganic pollutants imparting high COD, BOD and dark color. If such untreated wastewater is allowed to accumulate, the decomposition of organic materials it contains can lead to production of malodorous gases. Moreover wastewater contains numerous toxic substances, which affect the aquatic flora and fauna, resulting in loss of productivity of natural waters and deterioration of water quality to such an extent that the water becomes unusable. Thus it is obvious that the proper treatment of pulp and paper industry effluent (Black Liquor) is quite necessary. This invention related to an improved composition useful for the treatment of black liquor, an effluent from pulp and paper industry and the use there of in such treatment. The novelty of the process lies in the use of flocculating agent, comprising salt from Group I elements, transition metal and natural earth. The process of the present invention removes COD, TDS and color simultaneously from black liquor at ambient temperature, thus saving energy cost, the operation does not involve any use of mineral acid thus, avoiding corrosion problems.