assessment, kinetics and modelling of biofilm membrane bio-reactor for the
treatment of dairy wastewater
Ravi Sankar1*, S. Chandran1 and D. Pradeep Pandiyan2
Civil Engineering, Thiagarajar College of Engineering, Madurai-625 015, India
2Water Supply and
Wastewater Department, Khatib and Alami Engineering Consultants Private
Limited, Bengaluru-560 025, India
Author E-mail: firstname.lastname@example.org
Paper received :
Revised received :
Re-revised received :
Accepted : 04.04.2018
Aim: The present study
investigated the performance of a bench scale Biofilm Membrane Bioreactor
(BF-MBR) and determined relevant biokinetic coefficient for subsequent
kinetic modelling and simulation studies for evaluating the feasibility of
BF-MBR for treating dairy wastewater.
Methodology: The bench-scale
BF-MBR was devised by combining conventional aerobic membrane bioreactor with
a moving bed biofilm reactor. The bioreactor was operated at varying
Hydraulic Retention Times (HRT) of four, six, and eight-hour to determine the
optimum HRT and thereby, enhance reactor performance. Kinetic studies were
also performed on the BF-MBR treated dairy effluent to determine the
biokinetic coefficients like yield coefficient and other rate constants.
Subsequently, kinetic modelling and simulation studies which incorporates the
obtained biokinetic coefficients were performed using BioWin, a simulation
software, used to optimize system design and performance.
Results: The results
revealed that the Biofilm MBR that operated at an optimum HRT of six hours
produced treated effluent with the following physico-chemical properties:
Chemical Oxygen Demand= 60.90 mg l-1, Total Nitrogen = 9.61 mg l-1
and Total Phosphorus = 6.26 mg l-1 corresponding to removal
efficiency of 97.25%, 91.8% and 64.8% respectively. The obtained average
value of biokinetic coefficients were Yield Coefficient = 0.617 mg mg-1,
Decay rate = 0.1387 per day, maximum specific growth rate = 2.5189 per day
and saturation constant = 888.917 mg COD l-1. Also, the simulated
effluent characteristics were found to be closely related with those of an
experimental investigation showing R2 values of 0.9586, 0.8394 and
0.8362 for various concentrations of COD, TN and TP, respectively.
Interpretation: It was observed
from the laboratory bench-scale performance and modelling studies that
biofilm-membrane bio reactor is a suitable system for removal of organic and
nutrient pollutant from dairy wastewater to meet the discharge standards.
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