Pilot-scale testing 

Water reuse is no longer an option for many communities
Population pressures are placing extreme demands on the availability of easily treatable sources of drinking water.  Reuse of treated wastewater has been adopted by many communities to relieve these pressures.  Typical applications of water reuse include the following:

  • Aquifer storage and recovery projects
  • Total Maximum Daily Load (TMDL) compliance
  • Irrigation of right-of-ways, green spaces and crops
  • Pilot-scale testing for water reuse applications

SMI can design and execute experiments to ensure your water reuse project produces water appropriate for its intended use.  SMI works directly with water treatment engineers studying advanced water treatment systems such as membrane filtration to assess the microbiological quality of effluent, to document the efficiency of novel treatment processes and to assist in identifying suitable water reuse options.  In support of these objectives, SMI provides wastewater analyses for:

  • Cryptosporidium
  • Giardia
  • Bacteria
  • Aerobic spores
  • Viruses
  • Bacteriophage MS-2

Water reuse pilot study (Long Island, New York)
SMI has completed a pilot-scale wastewater reuse project in Suffolk County, New York, in conjunction with the H2M Engineering Group.  Because Suffolk County has targeted a reduction in effluent discharges to sensitive estuarine and marine areas, they contracted with H2M and SMI to develop a long term plan for water reuse.  SMI directed and implemented microbial challenge studies at the Advanced Water Treatment Facility in Riverhead, New York, to determine the microbial removal efficiencies of cloth filtration, membrane microfiltration and ultrafiltration, and UV disinfection of secondary effluent using model bacteria and viruses.A key element of the study included irrigation of a model golf green using the treated effluent to simulate the performance of the operational scale system currently under development.

SMI used laboratory-cultured viruses and bacteria to evaluate the performance of the pilot system for pathogen removal and used the treated effluent for irrigation of the constructed test plot.  Irrigation cycles for the test plot were modeled after those currently in use at a neighboring golf course in anticipation of operational-scale irrigation following completion of the study. As can be seen in the image of the golf green, the treated effluent produced by the pilot-scale treatment system was used successfully to irrigate the test plot.  Effluent irrigation resulted in a high quality turf and putting green, and no detrimental effects were observed for the ornamental shrubs installed by the greens keepers.  The results of this study are being used to implement an operational-scale (300,000+ gpd) reuse system for irrigation of a Long Island golf course in 2006.