Bleach Plant Effluents from the Pulp and Paper Industry by Pratima Bajpai

By Pratima Bajpai

This ebook covers bleach plant effluents, that the majority polluting effluent from the pulp and paper undefined. Disappearance of benthic invertebrates, a excessive prevalence of fish ailments, and mutagenic results at the aquatic fauna are a number of the effects of the disposal of bleach effluents into floor waters. This booklet describes environmental impression of bleach plant effluents, environmental rules, and measures to minimize the pollutants load by means of inner method amendment and exterior therapy of bleach plant effluents.

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The washing efficiency of these washers depend on the nature and quality of the fibrous raw materials. Most small industries use brown stock washers for washing of pulp produced from agro residues but the efficiency of these washers is not satisfactory as high carry over of black liquor along with pulp is observed in agro-based industries. , to minimize the amount of black liquor entering the bleaching section. 3 Oxidative Alkali Extraction Addition of oxygen to the pulp in alkaline extraction is an efficient method for increasing the bleaching effect and decreasing the consumption of chlorine chemicals and hence the pollution load.

Many studies have investigated the quality of bleaching effluents from ECF and TCF bleaching processes (Nelson 1998). The general conclusion from each of these studies is that the differences in toxicity in a wide variety of test species are not significant, and that secondary biological treatment removes toxicity from the effluents. The effluent from a modern bleached Kraft pulp mill is found to show a low level of toxicity when subjected to very sensitive tests, such as the induction of MFO enzymes in the livers of fish (Hodson et al.

These areas include product quality development, management of non-process elements, reduction of solid waste generation and air emissions, management of process upset conditions, and mill chemical balances. Enzyme Pretreatment Xylanase pretreatment of pulps prior to bleach plant reduces bleach chemical requirements and permits higher brightness to be reached (Viikari et al. 2009). The reduction in chemical needed can translate into significant cost savings when high levels of chlorine dioxide and hydrogen peroxide are being used.

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