Efficiency of Bit Trap Filter in industrial wastewater treatment of alcohol factory discharge to Manjil Dam in Alborz province

Abstract

Introduction: Reuse of wastewaters and sewages has been considered for many years. In order to
maintain the health of the environment and related organisms, it is necessary to reduce the amount
of wastewaters pollution before release into the environment. In recent years, due to the advent of
the Covid 19 epidemic and the increase in the production and use of alcohol, the wastewater from
alcohol production has increased significantly. On the other hand, due to drought and water
shortage in the current century, the reuse of sewages is an effective way to reduce problems.
Materials and Methods: Relying on the performance of the Bit Trap Filter, water treatment and
recycling of sewage from alcohol production in two types of vinasse and stillage were studied.
BOD, COD and pH factors were measured in two samples of vinasse and stillage wastewater. They
were then exposed to pure oxygen nano-bubbling in a tank for three hours and after that, they
entered the Bit Trap Filter and after ten days, a sample was randomly taken at the output every 24
hours and evaluated.
Results: BOD, COD and pH factors were obtained in vinasse wastewater at 37216.67±4348.08,
78566.65±3629.51 and 4.30 and in stillage wastewater at 43166.68±3003.89, 91700.00±9106.04
and 5.20, respectively. During the experimental stages and after ten days, the amount of these
factors were reported in treated vinasse sewage 953.50±32.36, 2437.33±107.58 and 7.20 and in
treated stillage sewage 1392.67±93.66, 3953.34±174.16 and 7.80. Based on the obtained results,
the amount of BOD and COD factors in alcohol production wastewater of vinasse type have
decreased by 97.44% and 96.90% and in alcohol production wastewater of stillage type decreased
by 96.77% and 95.69%, respectively. The pH factor has increased by 40.28% in vinasse wastewater
and 33.33% in stillage wastewater.
Conclusion: In this experiment, the efficiency of the Bit Trap Filter in both types of vinasse and
stillage wastewaters is known and confirmed, but in the vinasse wastewater, it shows better
performance. Also, in both types of wastewater, the BOD factor had the highest decrease and the
lowest changes were numerically related to pH. Finally, due to the appropriate efficiency and low
cost of construction, the Bit Trap Filter is proposed as an efficient and cost-effective system in the
field of wastewater treatment in the alcohol industry.