Abstract
Abstract A low-cost sediment-feed system was developed to introduce suspended solids to flow-through mesocosms. This design allows suspended solids to be regulated independently from the flow rate and turbulence within experimental tanks. It incorporates a stock vessel holding a vigorously mixed and very dense sediment suspension. A slow drip of particle-free water causes periodic overflows that gradually introduce this sediment suspension, via gravity-feed lines, to a head tank supplying the flow-through system. Suspended solids never pass through pumps, valves, or narrow tubing that are prone to clogging. The system was operated continuously for 72 h, delivering particle-laden water to four 40-L tanks at 1.3–1.5 L/min each. With occasional operator adjustments, suspended solids were maintained within 15% of a target concentration of 6 mg/L.
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