Thesis - faculty.ait.ac.th - Asian Institute of Technology

Table 2.8 Summary of Biokinetic Coefficient of Activated Sludge Process for Landfill
Leachate Treatment
So(BOD5)
(mg/L)
k
(d -1 )
Ks
(mg/L)
Y
(mg/mg
)
kd
(d -1 )
19
θc
(d)
T
(°C)
Reference
36,000 0.75 200.0 0.33 0.0002 6.5 23 to 25 Uloth and
5
Mavinic, 1977
15,800* 0.6 175.0 0.40 0.050 - 22 to 24 Cook and
Foree, 1974
13,640 0.77 20.4 0.39 0.022 3.6 23 to 25 Zapf –Gilje and
0.71 29.5 0.63 0.075 - 16 Mavinic, 1981
0.46 14.6 0.50 0.028 - 9 Graham and
0.29 11.8 0.43 0.008 7.5 5 Mavinic, 1979
8,090 1.16 81.8 0.49 0.009 1.8 22 to 23 Wong and
1.12 63.8 0.51 0.018 1.8 15 Mavinic, 1984
0.51 34.6 0.51 0.006 4.0 10
0.34 34.0 0.55 0.002 5.4 5
1,000 4.50 99.0 0.59 0.040 0.42 22 to 23 Lee, 1979
365 1.80 182.0 0.59 0.115 - 21 to 25 Palit and
Qasim, 1977
3,000 - - 0.44 - 1 to 20 10 Robinson and
Marais, 1983
2,000 0.46 180.0 0.50 0.100 2 to 10 25 Gaudy, et al.,
1986
Domestic 2-10 25-100 0.4-0.8 0.025- - - Tchobanoglous,
Wastewater
0.075
et al., 2003
So = BOD5 (* COD) k = substrate removal rate Ks = half-velocity constant
Y = yield coefficient kd = endogenous decay coefficient Θc = solid retention time
T = temperature
Keenan, et al. (1984) investigated the combined physico-chemical process with
activated sludge process. It was observed that the reduction in ammonia by stripping and
neutralization with H2SO4 and H3PO4 after that entered to activated sludge process. The
organic matter in terms of BOD was reduced 99% and the corresponding COD removal
was 95%. The effluent BOD to COD ratio was 0.16. The reduction in ammonia was 90%
and heavy metals removal ranged from 27% to 75%.
Dzombak, et al. (1990) had studied the treatment of leachate in an extended aeration
system. The BOD/COD ratio of the leachate was below 0.1 which is a characteristic of old
landfill leachate containing mainly refractory organic compounds. Different mean-cell
residence times from 15 to 60 days were investigated. It was observed that maximum
COD removal of 40% could be achieved with mean-cell residence time of 60 days. This
suggested that leachate from young landfills with organic matter containing high volatile
acids can be more easily treated with an activated sludge process than old landfill leachate.
Doyle, et al. (2001) performed the sludge characterization studies in the nitrification
process used for ammonia removal in an “old” landfill leachate. Whilst most researchers
(Knox, 1985; Robinson and Maris, 1983; Strachan, et al., 2000) reported poor settleability