2. Materials and methods
2.1. Site selection
This study was conducted at Gainesville Regional Utilities (GRU) Main Street Water Reclamation Facility (MSWRF) in Gainesville, Florida. MSWRF was selected for two reasons: (1) access to electricity, and (2) a construction site with full sunlight. Fully treated wastewater that had been filtered and de-chlorinated was used as the inflow water to the algae scrubber system. Filtration removes sludge particles that could contaminate the raceways, and de-chlorination was necessary to ensure that chlorine did not negatively affect algal growth. The influent water used for all raceway experiments was pumped from the MSWRF outflow to a 4160 L holding tank. A 0.3 horsepower Little Giant sump pump then supplied water to the raceways.
2.2. Raceway design
Six raceways were constructed at MSWRF (see Fig. 1). Flow rates to each raceway were carefully calibrated using a 3.8 cm (1.5 in) diaphragm valve on the main PVC line, then a 1.27 cm (0.5 in) diaphragm valve on the supply line for Raceways 1 and 2, a 1.91 cm (0.75 in) diaphragm valve for Raceways 3 and 4, and a 2.54 cm (1 in) diaphragm valve for Raceways 5 and 6. Water from the inflow pipes emptied into holding tanks, before being gravity-fed into the raceways using 3.175 cm (1.25 in) PVC pipe (see Fig. 1). Inflow water was sampled from either the supply PVC lines before the raceway holding tanks or the 3.175 cm (1.25 in) PVC pipe used to gravity-feed the water to each raceway. Flow was measured for each raceway using 1.91 cm (0.75 in.) “short” Sensus iPerl™ water meters. Flow rates were checked and calibrated daily using the digital gallon totalizer displays on the iPerl™ meters and a stopwatch.
2. Materials and methods2.1. Site selectionThis study was conducted at Gainesville Regional Utilities (GRU) Main Street Water Reclamation Facility (MSWRF) in Gainesville, Florida. MSWRF was selected for two reasons: (1) access to electricity, and (2) a construction site with full sunlight. Fully treated wastewater that had been filtered and de-chlorinated was used as the inflow water to the algae scrubber system. Filtration removes sludge particles that could contaminate the raceways, and de-chlorination was necessary to ensure that chlorine did not negatively affect algal growth. The influent water used for all raceway experiments was pumped from the MSWRF outflow to a 4160 L holding tank. A 0.3 horsepower Little Giant sump pump then supplied water to the raceways.2.2. Raceway designSix raceways were constructed at MSWRF (see Fig. 1). Flow rates to each raceway were carefully calibrated using a 3.8 cm (1.5 in) diaphragm valve on the main PVC line, then a 1.27 cm (0.5 in) diaphragm valve on the supply line for Raceways 1 and 2, a 1.91 cm (0.75 in) diaphragm valve for Raceways 3 and 4, and a 2.54 cm (1 in) diaphragm valve for Raceways 5 and 6. Water from the inflow pipes emptied into holding tanks, before being gravity-fed into the raceways using 3.175 cm (1.25 in) PVC pipe (see Fig. 1). Inflow water was sampled from either the supply PVC lines before the raceway holding tanks or the 3.175 cm (1.25 in) PVC pipe used to gravity-feed the water to each raceway. Flow was measured for each raceway using 1.91 cm (0.75 in.) “short” Sensus iPerl™ water meters. Flow rates were checked and calibrated daily using the digital gallon totalizer displays on the iPerl™ meters and a stopwatch.
การแปล กรุณารอสักครู่..
