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Premium member Presentation Transcript PULP & PAPER INDUSTRY: PULP & PAPER INDUSTRY BY:- ANUPAM PANDEY, MAYANK BHARDWAJ, ASHISH SHARMA, ANUJ GUJJAR, ANKIT RANA 19/03/2012 1CONTENTS: CONTENTS REQUIREMENTS PROCESSES WASTE GENERATION POINTS CHARACTERISTICS OF W/W TREATMENT SCHEMES CHARACTERISTICS OF TREATED W/W INNOVATIVE TECHNOLOGY Reff :- S. C. Bhatia 19/03/2012 2REQUIREMENTS: REQUIREMENTS Raw Materials -Conventional raw material are rice and wheat, straw, bagasse, jute, cotton rags, grasses, gunny, hessian, etc . Chemical Requirements - About 5-12% of NaOH is required per tonne of raw material . Lime is used as supplement to NaOH. Chlorine and calcium hypochlorite are bleaching chemicals. Sizing chemicals and dyes are also used 19/03/2012 3Raw materials used in paper industry.: Raw materials used in paper industry. 19/03/2012 4PowerPoint Presentation: Water Requirements - P and P industry’s existence lies on water supply. Constant water supply is required in all processes. Agricultural residue based industries require 200-350 cubic meter per tonne of paper made, however units using waste paper require 100-150 cubic meter per tonne of paper made. 19/03/2012 5PROCESSES: PROCESSES Step 1 Wood preparation The bark is removed from in-coming logs, and these are then chipped. Sometimes, the wood arrives at the plant already chipped, meaning that this step is unnecessary . Step 2 Cooking The wood chips are heated in a solution of NaOH and Na2S in a pressure cooker, during which time a lot of the lignin is removed from the wood . The pressure is then released suddenly, causing the chips to fly apart into fibres . 19/03/2012 6PowerPoint Presentation: Step 3 Pulp washing The pulp is washed with water to wash out the cooking chemicals and lignin from the fiber so that they will not interfere with later process steps. A good removal of chemicals is necessary for several reasons :- * The dissolved chemicals interfere with the downstream processing of the pulp. * The chemicals are expensive to replace . 19/03/2012 7PowerPoint Presentation: Step 4 Pulp screening Apart from fibres , the cooked pulp also contains partially uncooked fibre bundles and knots . Modern cooking processes have good control over the delignification and produce less "rejects ". Knots and shives are removed by passing the pulp over pulp screens equipped with fine holes or slots . Step 5 Bleaching This is done in two stages. Firstly the pulp is treated with NaOH in the presence of O2 . The NaOH removes hydrogen ions from the lignin and then the O2 breaks down the polymer . Then , the pulp is treated with ClO2 then a mixture of NaOH, O2 and peroxide and finally with ClO2 again to remove the remaining lignin. 19/03/2012 8PowerPoint Presentation: 19/03/2012 9PowerPoint Presentation: Step 6 Paper making The fibers are mechanically treated to make them bond better to each other, chemicals added to provide special properties such as color or water resistance, and then the water is squeezed out and the pulp is rolled smooth and dried. Various ancillary processes result in the recovery of CaO, NaOH and Na2S, the major chemicals used in the process . Various utilities ensure that such conditions as sufficient reaction times and adequate mixing are met . 19/03/2012 10WASTE GENARATION POINTS: WASTE GENARATION POINTS Sources of waste water- i ) Black liquor* from cooking section. ii) Pulp wash water from pouchers. iii) Bleaching section. iv) Paper machine. * Black liquor is the spent cooking liquor from the kraft process when digesting pulpwood into paper pulp removing lignin, hemicelluloses and other extractives from the wood to free the cellulose fibers. 19/03/2012 11CHARACTERISTICS OF WASTE WATER: CHARACTERISTICS OF WASTE WATER 19/03/2012 12PowerPoint Presentation: 19/03/2012 13TREATMENT SCHEMES: TREATMENT SCHEMES 19/03/2012 14PowerPoint Presentation: 19/03/2012 15PowerPoint Presentation: 16PowerPoint Presentation: 19/03/2012 17CHARACTERISTICS OF TREATED WASTE WATER: CHARACTERISTICS OF TREATED WASTE WATER 19/03/2012 18PowerPoint Presentation: 19/03/2012 19INNOVATIVE TECHNOLOGY: INNOVATIVE TECHNOLOGY 19/03/2012 20POLYMER INDUCED FLOCULATION: POLYMER INDUCED FLOCULATION Treatment of Pulp and Paper Mill Wastewater by Polyacrylamide (PAM) in Polymer Induced Flocculation. Cationic polyacrlyamide Organopol 5415 with very high molecular weight and low charge density is found to give the highest flocculation efficiency in the treatment of the paper mill wastewater. 19/03/2012 21PowerPoint Presentation: It can achieve 95% of turbidity reduction, 98% of TSS removal, 93% of COD reduction and sludge volume index (SVI) of 14 ml g−1 at the optimum dosage of 5 mg l− 1. Based on the cost evaluation, the use of the polyacrylamides is economically feasible to treat the pulp and paper mill wastewaters . Result suggests that single-polymer system can be used alone in the coagulation–flocculation process due to the efficiency of the polyacrylamide. 19/03/2012 22PowerPoint Presentation: Sedimentation of the sludge by gravity thickening with settling time of 30 min is possible based on the settling characteristics of the sludge produced by Organopol 5415 that can achieve 91% water recovery and 99% TSS removal after 30 min settling. 19/03/2012 23PowerPoint Presentation: THANK YOU 19/03/2012 24PowerPoint Presentation: ANY QUERRIES? ? ? ? ? ? ? 19/03/2012 25 You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.