Abstract
Water utilities, commercial and industrial establishments are required to upgrade or install new treatment systems to comply with the revised effluent standards issued by the Department of Environment and Natural Resources – Environment Management Bureau (DENR – EMB) which now includes removal and monitoring of nutrients (nitrogen and phosphorus components). One solution is to utilize a biological nutrient removal technology (BNRT) system capable of removing nutrients from sewage. The on-going study aims to investigate the performance of the pilot-scale system in the removal of nutrients from sewage. The designed pilot-scale anaerobic-anoxic-oxic (A2O) process with a total hydraulic retention time of 8.37 hrs. was operated in an existing sewage treatment plant (STP). System modification was adapted to ensure continuous operation. Dissolved oxygen (DO) and temperature of each compartment were evaluated after 45 days of system modification. The DO of the anaerobic and oxic compartment remained within the required range, while the internal recycling flowrate and/or aeration must be adjusted to achieve a DO concentration of 0.20 – 0.50 mg/L in the anoxic compartment. The research is financially supported by the Philippine Council for Industry, Energy and Emerging Technology Research and Development of the Department of Science and Technology (PCIEERD Project No. 04176).
Highlights
Rapid urbanization has contributed to deteriorating water quality
The removal efficiencies for NH3-N and PO43- are low compared to other studies (Fan et al, 2009; Tran and Tran, 2011; Xiang et al, 2014)
The pilot-scale A2O system was designed based on several parameter values in the book of von Sperling (2007) and was installed at an existing sewage treatment plant to investigate its performance
Summary
Rapid urbanization has contributed to deteriorating water quality. It was reported that about millions of cubic meters of untreated wastewater are discharged to water bodies such as Manila Bay and Laguna Lake (The International Water Association, 2018). Untreated wastewater contains high concentration of nutrients such as nitrogen and phosphorus, resulting to several environmental issues such as eutrophication and fish kill (Falahti-Marvast and Karimi-Jashni, 2015; Majdi Nasab et al, 2016; Simeon, 2019). Examples of BNR systems are anoxic-oxic (AO), anaerobic-anoxic-oxic (A2O), University Cape Town (UCT), and 5-stage Bardenpho (5-BP) (Tchobanoglous et al, 2003; von Sperling, 2007; Xiang et al, 2014). The utilization of these systems has been studied extensively in several countries, especially in developing countries, for different wastewater characteristics, operating parameters, and system configuration. The utilization of these systems has been studied extensively in several countries, especially in developing countries, for different wastewater characteristics, operating parameters, and system configuration. Fan et al (2009) evaluated the performance of a modified
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