Operation of Reactor MBBR

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Ingeniería Ambiental
    WINNIPEG SEWAGE TREATMENT PROGRAM SOUTH END PLANT PAGE 1/17 ANSWERS TO EAP PRELIMINARY REPORT A ISSUE AFTER RECEPTION OF EAP REPORT 13/10/10 ASI Rev NATURE OF REVISION DATE MADE APPROVED  WINNIPEG SEWAGE TREATMENT PROGRAM SEWPCC – Answers to EAP report  Page 2 of 17 Following the reception of the preliminary EAP report, the Program prepared and forwards to the EAP the answers to its questions. Before detailing the technical answers, the Program would like to remind the following : ã  The work done so far on SEWPCC and presented in the Process Selection Report (PSR) and during the workshop is the work of the Program and not Veolia’s. The EAP report shall be corrected in that sense. ã  The Program clearly understands the recommendations from the Manitoba CEC, especially regarding sustainability of the process and phosphorus recovery. The Program believes anyway that any recommendation has to be confronted to the cost it generates before being eventually considered as a rule for the project. The Program also reminds that all the 3 options allow at least one part of biological phosphorus removal and that recent researches have shown that at least the fertilizing power of phosphorus can be valorized from any kind of phosphorus. ã  The importance of sustainability within the Program is assessed by the Management Team through the weighting of the comparison criteria. 1. PROCESS   COMPARISON 1.1   OPTION 1 Note : option 1 has been eliminated by every attendee of the workshop. C1 : Based on the other two items in this sections being statement of facts does the reader assume that this is based on simulations or is this an assumption? P1 : This is based on results of simulations and calculations C2 : It is not clear at all what is the basis of predicting any of these removal efficiencies at maximum month conditions. The reported values do not agree with the operator stated baluers and need to be verified. These low removal values have a profound impact on the biological portion of the plant. Higher primary effluent TSS will increase the mass of inert and unhelpful organic material in the biological reactor, thus requiring a higher MLSS concentration to achieve equivalent treatment performance. P2 : The explanation of these removal efficiencies is as given below :  WINNIPEG SEWAGE TREATMENT PROGRAM SEWPCC – Answers to EAP report  Page 3 of 17 Expected efficiency of the primary settling Parameters Units DESIGN Spring max month AVERAGE Yearly avg Expected Removal Efficiency COD % 18 23 BOD 5 % 16 22 SS % 34 44 TKN % 6.0 8.0 Total P % 3.8 6.0 Expected Settled Water Quality FOR DESIGN SITUATION COD mg/l 295 kg/d 35 400 BOD 5 mg/l 138 kg/d 16 560 SS mg/l 104 kg/d 12 480 TKN mg/l 31 kg/d 3 720 Total P mg/l 4.8 kg/d 576 The efficiencies on the primary settlers have been estimated from actual results on existing primary settlers and considering that the velocities will be increased a little bit. The quality of the water (very diluted water) is also considered in the efficiencies calculations. See, here below, the results on TSS efficiencies on existing primary settlers during last five years and the percentile curve:  WINNIPEG SEWAGE TREATMENT PROGRAM SEWPCC – Answers to EAP report  Page 4 of 17 TSS primary settler efficiency0,0%10,0%20,0%30,0%40,0%50,0%60,0%70,0%80,0%90,0%100,0%110,0%14/janv/200428/mai/200510/oct/200622/févr/20086/juil/200918/no date    T   S   S  p  r   i  m  a  r  y  s  e   t   t   l  e  r  e   f   f   i  c   i  e  n  c   i  e  s TSS primary settler efficiency0,0%10,0%20,0%30,0%40,0%50,0%60,0%70,0%80,0%90,0%100,0%20,0% 30,0% 40,0% 50,0% 60,0% 70,0% 80,0% 90,0% 100,0% percent du temps    T   S   S  p  r   i  m  a  r  y  s  e   t   t   l  e  r  e   f   f   i  c   i  e  n  c  y   C3 : Why the primary effluent entering the pre-anoxic zone ? the purpose of the pre-anoxic  zone is to reduce dissolved oxygen and nitrate concentration prior to the anaerobic zone so not to reduce the effectiveness of the anaerobic (bio-P) process. The process diagram needs to be updated as well to reflect the actual design. P3 : The primary effluent can be introduced partially in the pre-anoxic zone and partially downstream directly in the anaerobic zone, but not totally downstream. The best choice is
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