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Investigation of suspended solids removal from municipal wastewater using hydrocyclone

Tzikas Filippos

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Summary

In the modern era, Wastewater Treatment Plants (WWTPs) are increasingly seeking ways to reduce environmental impacts, minimize costs and energy demands, and enhance efficiency. Consequently, there is an urgent need to identify innovative technologies aimed at reducing energy consumption in WWTPs. The objective of this thesis is to evaluate the effectiveness of a hydrocyclone in removing Total Suspended Solids (TSS), Biochemical Oxygen Demand (BOD₅), and Chemical Oxygen Demand (COD) from urban wastewater. Additionally, the efficiency of the hydrocyclone was examined under different incoming wastewater flow rates to investigate the impact of inlet velocity on system performance. Furthermore, measurements were conducted to assess the particle size distribution before and after wastewater treatment using the hydrocyclone system.The analyses demonstrated significant removal rates: TSS 46.34% ± 17.63%, BOD₅ 23.34% ± 9.023%, COD 16.04% ± 4.881%. The concentration of the rejected water was calculated at 1150 ± 220 mg/L. In the experiments conducted at different inlet flow rates (15 m³/h, 10 m³/h, 5 m³/h), it was observed that at 10 m³/h, the highest removal efficiencies were recorded: TSS 64.9% ± 5.5%, BOD₅ 30.2% ± 4.5%, COD 26.5% ± 1.45%.Moreover, the effectiveness of this flow rate was also reflected in particle size measurements. A reduction was observed in all size distribution indices (d₁₀, d₅₀, d₉₀). Specifically, a 19.6% reduction in d₁₀, 32.6% in d₅₀, and 52.8% in d₉₀ was recorded.In conclusion, the results obtained from the use of the hydrocyclone were encouraging regarding its ability to remove pollutants from liquid wastewater.

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