Abstract
Knowing the biodegradability characteristics of grey water constituents is imperative for a proper design and operation of a biological treatment system of grey water. This study characterizes the different COD fractions of dormitory grey water and investigates the effect of applying different conditions in the biodegradation test. The maximum aerobic and anaerobic biodegradability and conversion rate for the different COD fractions is determined. The results show that, on average, dormitory grey water COD fractions are 28% suspended, 32% colloidal and 40% dissolved. The studied factors incubation time, inoculum addition and temperature are influencing the determined biodegradability. The maximum biodegradability and biodegradation rate differ between different COD fractions, viz. CODss, CODcol and CODdiss. The dissolved COD fraction is characterised by the lowest degradation rate, both for anaerobic and aerobic conditions. The maximum biodegradability for aerobic and anaerobic conditions is 86 and 70% respectively, whereas the first order conversion rate constant, k 20, is 0.119 and 0.005 day−1, respectively. The anaerobic and aerobic conversion rates in relation to temperature can be described by the Arrhenius relation, with temperature coefficients of 1.069 and 1.099, respectively.
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Abbreviations
- APE:
-
Alkyl-phenol ethoxylate
- BMP:
-
Biological methane potential
- BOD:
-
Biochemical oxygen demand
- C :
-
Substrate concentration
- C 0 :
-
Initial substrate concentration
- °C:
-
Celsius
- CH4 :
-
Methane
- COD:
-
Chemical oxygen demand
- Col:
-
Colloidal
- CSTR:
-
Continuous stirred tank reactor
- DEEDMAC:
-
Diethyl ester dimethyl ammonium chloride
- dis:
-
Dissolved
- EXP:
-
Exponential
- fra:
-
Fraction
- HRT:
-
Hydraulic retention time
- k :
-
Kinetic rate constant
- LAS:
-
Liner alkyl benzene sulphonate
- Ln:
-
Natural logarithm
- MBR:
-
Membrane biological reactor
- MCR:
-
Membrane chemical reactor
- mf:
-
Membrane filtrate
- MW:
-
Molecular weight
- MWCO:
-
Molecular-weight cut-off
- pf:
-
Paper filtrate
- SLS:
-
Sodium laurel sulphate
- SRT:
-
Sludge retention time
- ss:
-
Suspended solids
- t :
-
Time
- T :
-
Temperature
- tot:
-
Total
- TVS:
-
Total volatile solids
- UASB:
-
Up-flow anaerobic sludge blanket
- UBOD:
-
Ultimate BOD
- VSS:
-
Volatiles suspended solids
- θ:
-
Temperature coefficient
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Acknowledgment
The research, upon which this paper has been based, is funded by the Dutch Ministry of Foreign Affairs (Nuffic).
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Abu Ghunmi, L., Zeeman, G., Fayyad, M. et al. Grey water biodegradability. Biodegradation 22, 163–174 (2011). https://doi.org/10.1007/s10532-010-9385-5
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DOI: https://doi.org/10.1007/s10532-010-9385-5