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Table 1 summarizes the major facilities that comprise the GWF domestic treatment train. While the design average capacity of the facility is 16,000 m3/day, served by four membrane cells, the peak wet weather capacity is approximately 40,000 m3/day. Treatment of the peak wet weather flow can be accommodated in the MBR by use of the eight industrial membrane cells for domestic treatment duty during peak wet weather periods (membranes only, not the industrial bioreactor), effectively increasing the available membrane area by a factor of three (i.e., from 4 cells to 12 cells). Facilities are available to store industrial wastewater during such events, allowing the use of the industrial membranes for peak wet weather service. Twelve Memcor Memjet submerged hollow-fiber ultrafiltration membrane racks were initially installed in each of the 12 membrane cells. However, for a variety of operational and commercial reasons the 12 Memjet racks in each of the four dedicated domestic modules were replaced with 15 Mempulse racks.

Table 1

GWF domestic train major treatment units

Unit processNumberSize/CapacityDescription
Domestic headworks 40,000 m3/d Two 5 mm screens followed by one vortex grit chamber; screening, washing and compaction, and grit classification and dewatering 
Activated primary sedimentation tank 21 m diameter, 4 m SWD Circular unit designed to operate in either conventional or activated modes 
Balance tank 5,000 m3 Lined earthen lagoon with membrane cover and liner, pumped mixing 
Domestic pre-filters 20,000 m3/d each 1 mm opening automatic, self-cleaning units 
Domestic biological nutrient removal bioreactors 3,068 m3 each Three-stage units consisting of initial mixed zone receiving ML recirculation from downstream aerated zone, main aeration zone receiving recirculation from membranes, and final mixed zone 
Domestic membranes 64 m3 each tank Memcor Mempulse units each containing 15 racks per tank with 7,220 m2 of membrane area for each tank 
Industrial membranes (used for peak wet weather domestic treatment 64 m3 each tank Memcor Memjet units each containing 12 racks per tank with 7,220 m2 of membrane area for each tank 
RO 2 Two-stage trains 7,085 m3/d each train Nominal 200 mm diameter elements with 7 elements per vessel. 26 vessels per train first stage; 13 vessels per train second stage. 75% average recovery, 85% max 
Unit processNumberSize/CapacityDescription
Domestic headworks 40,000 m3/d Two 5 mm screens followed by one vortex grit chamber; screening, washing and compaction, and grit classification and dewatering 
Activated primary sedimentation tank 21 m diameter, 4 m SWD Circular unit designed to operate in either conventional or activated modes 
Balance tank 5,000 m3 Lined earthen lagoon with membrane cover and liner, pumped mixing 
Domestic pre-filters 20,000 m3/d each 1 mm opening automatic, self-cleaning units 
Domestic biological nutrient removal bioreactors 3,068 m3 each Three-stage units consisting of initial mixed zone receiving ML recirculation from downstream aerated zone, main aeration zone receiving recirculation from membranes, and final mixed zone 
Domestic membranes 64 m3 each tank Memcor Mempulse units each containing 15 racks per tank with 7,220 m2 of membrane area for each tank 
Industrial membranes (used for peak wet weather domestic treatment 64 m3 each tank Memcor Memjet units each containing 12 racks per tank with 7,220 m2 of membrane area for each tank 
RO 2 Two-stage trains 7,085 m3/d each train Nominal 200 mm diameter elements with 7 elements per vessel. 26 vessels per train first stage; 13 vessels per train second stage. 75% average recovery, 85% max 

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