APPLYING INTERNAL CIRCULATION ANAEROBIC REACTOR FOR WASTEWATER TREATMENT: A CASE STUDY IN SAIGON PAPER MILL WASTEWATER TREATMENT PLANT

Industrial wastewater containing high organic compounds and high flow rate has always been a problem in developing and developed countries. To addressed the issue, many possible treatments have been developed through years of researches, some can be mention such as coagulation, [1] absorbance [2] and advanced oxidation process; [3; 4] however, biological treatments are favoured as they are environmental friendly, high BOD, COD removal rate, able to treat N and P. Two of the most popular processes in biological treatments are aerobic and anaerobic, they use microorganisms as a tool to treat organic industrial wastewater [5; 6]. Although both processes are necessaries in most complete wastewater treating system, anaerobic processprevail due to its advantages over aerobic:it requires no oxygen has a high load Chemical Oxygen Demand (COD), and minimizes sludge productionMany types of industrial wastewater treatment systems could not operate well with the absence of anaerobic treatment. Currently, the most popular anaerobic treatment is the Up-flow Anaerobic Sludge Blanket (UASB), which has been successfully applied in many types of wastewater [7]. However, industrial wastewater resulting from the manufacturing of pulp and paper, alcohol, citric acid and sweet potato has a very high COD, and the UASB is incapable of treating these types of wastewater due to its high Organic Loading Rate (OLR). As the average UASB OLR is only about 1–2 kgCOD/m3.d, [7] it is necessary to APPLYING INTERNAL CIRCULATION ANAEROBIC REACTOR FOR WASTEWATER TREATMENT: A CASE STUDY IN SAIGON PAPER MILL WASTEWATER TREATMENT PLANT