Turnkey solution eliminates chain and scraper downtime
Problem
The Grass Valley area of California has challenges that include mine drainage and heavy flows during the winter storm season in the Sierra Nevada foothills. On average, the city discharges 2.1 mgd to Wolf Creek, a tributary of the Bear River. In 2013, the chain and scraper clarifier system was reaching the end of its useful life, increasing the burden on the treatment system and its operators. Matters became worse when a collector system in two of the tanks became inoperable after a breakdown of the triple-output shaft drive system. The outage left
