Citation: Rajkumar K (2016) $Q(YDOXDWLRQRI%LRORJLFDO$SSURDFKIRUWKH(IÀXHQW7UHDWPHQWRI3DSHU%RDUGV,QGXVWU\$Q(FRQRPLF3HUVSHFWLYH J %LRUHPHGLDW%LRGHJUDG 366 GRL 366
Page 8 of 13
120
300
100
250
80
200
60
150
40
100
Outlet BOD (mg/l) BOD removal (%) Inlet BOD (mg/l)
20
50
0
0
1 3 5 7 9 1113151719212325272931 Days
Figure 9: (IÀXHQW%2'FRQFHQWUDWLRQVDQGUHPRYDOHI¿FLHQF\IRUELRORJLFDOR[LGDWLRQWUHDWPHQWRISDSHUERDUGLQGXVWU\ZDVWHZDWHU for the period of study.
1000 1200 1400 1600 1800 2000
100 120 140 160 180
0 20 40 60 80
0 200 400 600 800
Outlet COD (mg/l) COD removal (%) Inlet COD (mg/l)
1 3 5 7 9 1113151719212325272931 Days
Figure 10: (IÀXHQW&2'FRQFHQWUDWLRQDQGUHPRYDOHI¿FLHQF\IRUELRORJLFDOR[LGDWLRQWUHDWPHQWRISDSHUERDUGLQGXVWU\ZDVWHZDWHU for the period of study.
Table 2 shows the concentration of suspended solids measured from influent 756 mg/L after treatment the concentration of suspended solids measured from treated effluent 12 mg/L respectively. ETP operation performance to total suspended solids reduced 74% due to the presence of sedicell recover fibres system in ETP. A sedicell removes solids by means of dissolved air flotation and sedimentation simultaneously. Floatation of solids occurs because of air bubbles introduced into the feed water. Clarified water from the outlet of the sedicell is pumped under pressure through an air dissolving tube where air under pressure is dissolved in the water. This air stays in solution as long as the water is at pressure. The pressure is released by a special globe valve, just before this water is injected into the feed line. This pressure reduction causes the air to come out of solution and form millions of tiny air bubbles, which then attach themselves to the solid
particles in the feed water. These bubbles cause the solids to float to the surface of the sedicell where they can be removed by the spiral scoop. The recover fibres send back the stock preparation plant tower. The sedicell overflow wastewater less the 50 mg/L of TSS directly raw effluent reused in SFT plant, so that reduced the wastewater treatment cost and sludge production less in ETP primary clarifier. An economic perspective the sedicell recovered fiber again used in paper board manufacturing process and indirectly raw material wastage avoided and also raw material procurement cost saved. Energy consumption of aeration system: The biological treatment system has eight surface aerators (each 30 hp, 1 horsepower hour=0.746 kWh -1 ). The energy consumption of aerators 179.04 kWh −1 , the activated sludge process most efficient technology for the removal of
J Bioremediat Biodegrad ISSN: 2155-6199 JBRBD, an open access journal
Volume 7 • Issue 5 • 1000366
Made with FlippingBook Digital Proposal Creator