Citation: Rajkumar K (2016) $Q(YDOXDWLRQRI%LRORJLFDO$SSURDFKIRUWKH(IÀXHQW7UHDWPHQWRI3DSHU%RDUGV,QGXVWU\$Q(FRQRPLF3HUVSHFWLYH J %LRUHPHGLDW%LRGHJUDG 366 GRL 366
Page 6 of 13
5
5
EAT - DO (mg/l)
CAT -DO (mg/l)
4
4
3
3
2
2
1
1
1 3 5 7 9 1113151719212325272931 Days
Figure 6: Variation in the DHUDWLRQWDQN'2OHYHOIRUWKH period of study.
1.50
0.70
F/M - EAT
F/M - CAT
1.30
0.60
1.10
0.50
0.90
0.40
0.70
0.30
0.50
0.20
0.30
0.10
0.10
0.00
1 3 5 7 9 1113151719212325272931 Days
Figure 7: The F/M ratio LQHIÀXHQWWUHDWPHQWSODQWSURFHVVIRUWKH period of study.
can decrease the metabolism of the micro-organisms and the efficiency of the process. The optimum range for the DO in the treatment plants were in between 2-3.5 mg/L. F/M ratio: The food to microorganism ratio is defined as the ratio between the amount of food (organic matter) entering the treatment plant and the mass of micro-organisms (MLSS) in the aeration tank [23]. The F/M ratio is an important control parameter as the quantity of biomass present will influence the removal efficiency. The F/M ratio is indirectly proportional to the MLSS. If F/M ratio is low, then MLSS is high with low dissolve oxygen concentration. Due to which filamentous bulking occurs that cause poor settling problems. Figure
7 shows that the conversional and extended aeration tank F/M ratio effective to treat the wastewater. If F/M ratio is high then, MLSS is low which will affect the treatment process. If any fluctuation occurs in the production process and the wastewater entering the treatment system with high organic load than at that time the entire system fails because this will not be encountered properly by the low MLSS treatment system. This treatment results in effective BOD removal but face several problems. Low F/M ratio leads inadequate food for the population of microorganisms and problem arises in maintaining the sufficient dissolved oxygen concentration [24]. Nutrient dosing: Levels of nitrogen and phosphorus in paper
J Bioremediat Biodegrad ISSN: 2155-6199 JBRBD, an open access journal
Volume 7 • Issue 5 • 1000366
Made with FlippingBook Digital Proposal Creator