Santa Clarita Valley Water supplied drinking water to the town of Valencia (population 28,000). The water had a total hardness of 350 mg/l as CaCO3.
The Los Angeles Regional Water Quality Control Board (LAWQCB) imposed decreased chloride levels (<100 mg/l) in the outfall to the Santa Clara River. However, to decrease the chloride levels from 142 mg/l to the required level, at the Waste Water Treatment Plants (WWTP’s) by micro-filtration and reverse osmosis should be installed. The costs for this treatment were projected at $400 Million. It would also require a not acceptable brine waste line through Ventura County.
Crystalactor™ softening technology was used for the crystallization of calcium carbonate on calcite seeds, reducing the CAPEX dramatically. Primary RO concentrate continuously flows in an upward direction through the single reactor. The plant has a capacity to treat/soften up to 800 GPM (180 m3/h) and reduce the hardness down to 200 mg/l as CaCO3. The Crystalactor produces calcium carbonate pellets (sold at $20-$40 per ton) instead of a bulky sludge or brine, which reduces the operational costs for sludge handling significantly.
The Crystalactors reduce the total hardness from 350 mg/l to 200 mg/l as CaCO3. Self-regenerating softeners have been banned and the chloride target in the WWTP effluent is achieved, delivering high-quality water to Santa Clara River for downstream irrigation to cultivate avocado’s and strawberries.