Evaluation of Treatability of High Strength Wastewater in a Three Stage-Rotating Biological Contactor

Abstract

Cheese whey effluent contains biodegradable organic compounds in the range of 40 to 80 g·L–1. In this study, a three–stage rotating biological contactor was fabricated as a bench scale experimental unit to remove organic matters from cheese whey. First, the treatability of cheese whey effluent in the three–stage rotating biological contactor (RBC) was evaluated. Then the effect of extended specific surface area (SSA) and recirculation rate on COD removal was investigated. The obtained results showed that the organic removal rate increased with an increase in loading rate, till other limiting parameters affect the process. Prior to application of the designated modifications to the system, maximum COD removal efficiency at hrts of 24 and 36 h with OLR of 50 gcod·L–1·d–1 was 90 and 92.4%, respectively. The removal efficiency was improved as a result of increasing the SSA and recirculation rate. Also, recirculation rate may assist to increase the DO level of the wastewater, especially at high olrs. To sum up, obtained results showed that whey effluent has been efficiently treated in a continuous operation of bench scale RBC.

Evaluation of aerobic/anaerobic industrial wastewater treatment processes: The application of multi‐criteria decision analysis

“…In MADM, there is two types of ranking for a specific alternative under a given attribute, one with ordinal scales and the other with cardinal scales [20]. Ordinal scales can be represented in terms of numbers or verbal rankings (e.g., [1][2][3][4][5][6][7][8][9]. With ordinal scales, no numerical properties, such as ratios or distances, are used.…”

“…Type of measure Description C 1 Quantitative Negative Land requirement in square meter per cubic meters of raw wastewater C 2 Quantitative Negative Energy consumption in kWh per cubic meters of raw wastewater C 3 Quantitative Negative The excess sludge production in kilograms per cubic meters of raw wastewater C 4 Quantitative Positive The efficiency of treatment for removing COD and TSS parameters C 5 Qualitative Negative Using electromechanical equipment C 6 Qualitative Positive Ease of operation and Maintenance of wastewater treatment plant C 7 Qualitative Positive High shock capability in facing with impermissible wastewater C 8 Qualitative Negative Oder generation of individual alternatives was analyzed by eight criteria in the following steps (shown in the appendix).…”

“…Since the19th century, the conventional activated sludge has been widely used in municipal and industrial wastewater treatment plants (IWTPs). Other technologies, such as bio‐towers, rotating biological contactors (RBC), aerated lagoons, sequential batch reactors (SBR), and upflow anaerobic sludge blankets (UASB), have also been successfully used for industrial wastewater treatment . Owing to the fact that various methods are available for industrial wastewater treatment, the selection of the best method in terms of cost and efficiency has always been an important concern for water agencies and wastewater treatment plant (WWTP) designers .…”

Bioremediation of industrial effluents: A synergistic approach

“…Ebrahimi et al [127] treated cheese whey effluent having 40-80 g-COD/L in a bench-scale three-stage RBC. 92.4% COD removal activity was obtained at an…”

Treatment of Synthetic Leachate by Rotating Biological Contactor: A Review

“…To evaluate the biomass weight quantified by upon flashing the biomass off from the meshed material by water, and filtered with 0.45 µm membrane filter and dried it for 24 hours with a temperature of 105 ºC. [11] Abhay Srivastava(2018) "Performance evaluation of greywater treatment using Rotating Biological Contactor (RBC) along with Phytotreatment and future scope for use as drinking water" studied the performance of rotating biological contactor with 40% submergence in treatment of greywater. Greywater constitutes low organic content free from pathogens and also free from fecal matter.…”