to 4 feet of blanket, while RAS is maintained at only 10 to 25% of the flow rate. In addition, the controlling parameter

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To 4 Feet Of Blanket While Ras Is Maintained At Only 10 To 25 Of The Flow Rate In Addition The Controlling Parameter 1 (129.28 KiB) Viewed 7 times

to 4 feet of blanket, while RAS is maintained at only 10 to 25% of the flow rate. In addition, the controlling parameter is mixed liquor suspended solids (MLSS), ranging between 1700 mg/L in summer and 2400 mg/L in winter. There is no separate tank for volatile fatty acid generation. This practice provides a full nitrification and a significant degree of denitrification in the retrofitted activated sludge (AS) process. The average nitrate-nitrogen in the secondary effluent is 4 to 8 mg/L, leaving the denitrification filter to polish the effluent. Primary treatment Secondary treatment Influent Air Chlorine Effluent Collection system Screening & comminution Grit chamber Primary settling Aeration Secondary settling Chlorine contact tank ITÉSE Activated sludge Screenings Grit Thickener Anaerobic digester Sludge dewatering Sludge disposal Influent and Effluent Averages Average Sample Method/Frequency 4.12 5.8 0.26 Parameter Flow (MGD) Influent TP (mg/L) Effluent TP (mg/L) Influent BOD (mg/L) Effluent BOD (mg/L) Influent TSS (mg/L) Effluent TSS (mg/L) Influent ammonia nitrogen (mg/L) Effluent ammonia nitrogen (mg/L) Influent TN (mg/L) Effluent TN (mg/L) 320 3 328 1.21 28 Maximum Month 5.17 8.5 0.64 386 4.59 419 1.47 34.4 0.54 42.7 2.77 Maximum Month vs. Average (%) 25 46 140 20 32 27 13 27 22 37 30 Maximum Week 6.2 13.6 1.01 497 5.2 564 1.8 37.4 0.86 63.1 3.13 Weekly/composite Weekly/composite Daily/composite Daily/composite Daily/composite Daily/composite Daily/composite Daily/composite Daily/composite Daily/composite 0.44 31.2 2.14 Temperature (°C) 23 19 17 16 Monthly Averages for Plant Process Parameters Mixed Liquor Sludge Age Month Suspended Solids (mg/L) (days) October 2005 2.527 8.1 November 2005 2.445 7.9 December 2005 2.650 8.5 January 2006 2.686 8.6 February 2006 2.452 7.9 March 2006 2.643 8.5 April 2006 2.679 8.6 May 2006 2.417 7.8 June 2006 2.300 7.4 July 2006 2.378 7.6 August 2006 2.448 7.9 September 2006 2.574 8.3 Hydraulic Retention Time (hr) 23.1 13.9 15.9 15.1 16.4 23.6 27.9 23.5 19.4 23.0 25.1 21.6 14 16 18 20 24 26 27 25