Water/Wastewater Laboratory Calculations
Ideally, waterworks and wastewater treatment plants are sized to meet both current and future needs. No matter the size of the treatment plant, some space or area within the plant is designated as the “lab” area (ranging from being closet sized to fully equipped and staffed environmental laboratories). Water/wastewater laboratories usually perform a number of different tests. Lab test results provide operators with the information necessary to operate the treatment facility at optimal levels. Laboratory testing usually involves service line flushing time, solution concentration, pH, chemical oxygen demand (COD), total phosphorus, fecal coliform count, chlorine residual, and biochemical oxygen demand (BOD) seeded tests, to name a few. The standard reference for performing wastewater testing is contained in
Standard Methods for the Examination of Water and Wastewater,
APHA, AWWA WEF, 1995. In this chapter, we focus on standard water/wastewater lab tests that involve various calculations.
Specifically, we focus on calculations used to determine a proportioning factor for composite sampling, flow from a faucet estimation, service line flushing time, solution concentration, BOD, molarity and moles, normality, settleability, settleable solids, biosolids total, fixed and volatile solids, suspended solids and volatile suspended solids, and biosolids volume and biosolids density indexes.