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[Daegu - Optimal Processing/Management Mechanism for Non-Bio-Degradable Organic Matter (NBDOM) from “X” Sewage Treatment Plant] ▷ Description Currently, Daegu Metropolitan City is operating a total of seven sewage treatment plants, managing 1.3 million tons of sewage water on a daily basis. In the case of “X” sewage plant, it processes not only sewage water but also wastewater from three paper mills located nearby the plant itself. Wastewater from paper manufacture stems from recycling waste paper and worsens the efficiency of the sewage treatment plant with its high content of non-bio-degradable organic matter. Now, the wastewater from paper manufacture comprises 40% of the total inflow to the plant, which has a sizable impact on the quality of both influent and effluent. Recently, measures are being taken to include the Total Organic Carbon (TOC) in the effluent standards, speaking of which, the current TOC concentration of treated water exceeds the expected effluent standard. ▷ Scale The processing capacity of “X” sewage treatment plant, which is a facility that manages both household sewage and wastewater, is 45,000 ㎥/day. Presently, the average inflow is 28,000 ㎥/day, among which wastewater from the paper mills accounts for 10,000㎥/day (about 40% of the entire processing capacity). With insufficient information on the quality of wastewater from the paper mills, large amounts of unprocessed wastewater enter the sewage plant, making stable water quality management challenging. As a result, the current situation requires enhanced biological treatment like the A2O process to precede additional chemical treatment. ▷ Key specs Basic Information about “X” Sewage Treatment Plant - Facility capacity: 45,000 ㎥/day (initially 23,000 ㎥/day with the extension of 22,000㎥/day) - Treatment Mechanism: A2O (Biological Nutrient Removal System) + Coagulation & Precipitation Process - Average inflow per day: 28,000㎥/day (proportion of wastewater from the paper mills: 38%) - Water quality : influent quality (BOD 107.5mg/L, TOC 92.6mg/L), Effluent quality (BOD 0.9mg/L, TOC 13~15mg/L) ▷ Additional Info -
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