Abstract
Anaerobic/Anoxic/Oxic – Membrane BioReactor (A2O-MBR) system including A2O unit at short solids retention time (SRT) for accumulation of PO43--P and MBR at long SRT for nitrification of NH4+-N was used to enhance simultaneous removal of nitrogen and phosphorus from brewery wastewater. The model of A2O-MBR system made from polyacrylic with the capacity of 49.5 liters was operated with organic loading rate of 0.75 kgCOD/m3.day. Nitrate recycling ratio was increased from 100 to 300% while sludge recirculation ratio was maintained at 100%. The results showed that for the nitrate recycling ratios of 100, 200, 300%, average NH4+-N and total nitrogen (TN) removal efficiencies of the model were 95.7 and 72.4, 99.2 and 86.7, 99.3 and 89.6%, respectively. The removal efficiencies of chemical oxygen demand (COD) and total phosphorus (TP) were over 90 and 75%, respectively, regardless of nitrate recirculation ratio. The output values of COD, NH4+-N, TN and TP were within the limits of Vietnam National Technical Regulation on Industrial Wastewater (QCVN 40:2011/BTNMT), column A, throughout the experiments. The model with recommended system configuration and optimum operational conditions could treat not only nitrogen but also phosphorus well due to appropriate nitrate recycling ratios.
Highlights
Agriculture is the hub of economic activity in Pakistan
The polyacrylic model of A2O-MBR system included Anaerobic/Anoxic/Oxic unit having an approximate dimension of 480 mm L x 150 mm W x 600 mm H with the corresponding working volume of 36.0 liters which was divided by baffles to create three compartments in ratio of 2:4:2 [12] and MBR having an approximate dimension of 180 mm L x 150 mm W x 600 mm H with the corresponding working volume of 13.5 liters
For determination of the overall treatment performance in terms of organic and nutrient removals, the parameters of wastewater such as chemical oxygen demand (COD), Suspended Solid (SS), Total Kjeldahl Nitrogen (TKN), NH4+-N, NO2--N, NO3--N and total phosphorus (TP) were analyzed according to Vietnam National Standards (QCVN) together with Standard Methods for the Examination of Water and Wastewater (APHA) [20] at Research Institute for Aquaculture No.2 in Ho Chi Minh City
Summary
Agriculture is the hub of economic activity in Pakistan. It is the basic for economic development and growth of the economy. Under a development strategy by 2020, Vietnam’s beer industry would have output of 4.1 billion liters by 2020, 4.6 billion liters by 2025 and 5.5 billion liters by 2035 Along with this growth, serious problems with environmental pollution may be caused by a huge amount of brewery wastewater. A combination anaerobic-aerobic treatment system has been used and traditional aerobic biological treatment processes such as activated sludge (suspended growth) or biological filter (attached growth) are often implemented [1, 2, 3, 4] These processes have not yet treated thoroughly nitrogen and phosphorus from brewery wastewater to meet QCVN 40:2011/BTNMT, column A
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