Citation: Rajkumar K (2016) $Q(YDOXDWLRQRI%LRORJLFDO$SSURDFKIRUWKH(IÀXHQW7UHDWPHQWRI3DSHU%RDUGV,QGXVWU\$Q(FRQRPLF3HUVSHFWLYH J %LRUHPHGLDW%LRGHJUDG 366 GRL 366
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Stock Preparation Area Storage Chests Screening and cleaning
Pulper
Post costumer waste paper
Board Machine Head Box Top Former sheet Formation Press Section Pre Dying Size Press and Drying Calendaring and
Auxiliary chemicals, additives, fillers
Testing and Quality Assurance final product
Sludg
Effluent Treatment Plant
FINSHING DISPATH AND WARE HOUSE AREA Converting and finishing Labelling, storage, dispatch & transport
Figure 1: 6LPSOL¿HGVFKHPDWLFGLDJUDPRISDSHUERDUGPDQXIDFWXULQJSURFHVVHV
Effluent treatment plant components The wastewater generated from pulping process contains high concentration of BOD, COD and TSS, which subsequently undergo activated sludge process for the treatment. The ETP comprises of the following units, viz. drum screen, sedicell, equalization tank, primary clarifier, conventional Aeration, secondary clarifier – A, extended aeration, secondary clarifier – B, tertiary clarifier, chlorination, milt grad sand filter and mechanical dewatering devise (MDD). The activated sludge plant treats an average of 4000 m 3 wastewater per day. Other technical information, wastewater characteristics and operation condition can be found in Tables 1-3 and the schematics of the ETP depicted in Figure 2. The effluent is first passed through screened with coarse filters (bar screen), and followed by dram screen for removal, of plastic and other floating materials in the pre-treatment stage. The effluent pumped into sedicell fiber recover system with addition of flocculent (4 kg/d) to remove the bottom and top of flotation pulp with 6-7 par presser of air dissolving tube (ADT) system and output of effluent less than 50 ppm of TSS and effluent collect an equalization basin and after fiber/pulp recovery the raw effluent will be neutralized in equalization tank with coarse bubble aeration system with air blowers are provided for equalization of raw effluent and surge control and will
be taken to primary treatment where flocculants and coagulants are used to remove suspended solids. In convention aeration tank added nutrient for microbial activation purpose and surface aerators are provided in aeration basins for oxygen transfer and mixing of biomass with wastewater. This is aerobic biological treatment process where the bacteria decompose the organic matter in presence of oxygen. The extended aeration system works in the lag growth phase of the bacterial growth curve i.e., endogenous phase. To maintain requisite MLSS and food to micro-organism ratio (F/M), part of settled sludge from Secondary Clarifier will be re-circulated back to the aeration tank. In addition diffused aeration arrangement also provided at the periphery of aeration tank which will ensure mixing of sludge once in a while. The clarifier is a hopper bottom circular tank with centrally driven clarifier mechanism. In clarifier solids get settled at the hopper bottom. The supernatant from the clarifier overflows uniformly over the peripheral launder. A part of sludge from clarifier re-circulated back to aeration tank while balanced is sent to thickener through sludge pump. Effluent from secondary clarifier-B shall be entering into the accelerated gravity separator. AGS is high rate treating clarifier, which produces treated water of highest quality with minimum time, space and chemicals. The supernatant from AGS overflows uniformly over the peripheral launder. It will
J Bioremediat Biodegrad ISSN: 2155-6199 JBRBD, an open access journal
Volume 7 • Issue 5 • 1000366
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