Showing papers on "Hydraulic retention time published in 1975"
TL;DR: The Marias-Shaw model and the Monod model adequately describe the kinetics of soluble organic carbon removal in a model anaerobic waste stabilization pond, but the plug-flow model does not adequately represent the kinetic activity of solubleorganic carbon removal.
Abstract: The quantity of attached biomass in a model anaerobic waste stabilization pond is affected by light penetration, hydraulic flow pattern, baffle configuration, and the submerged surface area. The Marias-Shaw model and the Monod model adequately describe the kinetics of soluble organic carbon removal in a model anaerobic waste stabilization pond. However, the plug-flow model does not adequately represent the kinetics of soluble organic carbon removal. Baffles significantly increase the amount of attached biomass, and at lower hydraulic residence times increase soluble organic carbon removal. With a l.5-day hydraulic residence time, a pond without bafles removes 53% of the soluble organic carbon, while ponds with end-around, over-and-under, and longitudinal baffles remove 60%, 62%, and 70% soluble organic carbon, respectively. Dense scum layers, which often form on baffle ponds, significantly reduces the biodegradation of soluble organic carbon.
9 citations
01 Dec 1975
TL;DR: In this paper, the effects of shock temperature on biological systems were investigated and design and operating factors other than hydraulic residence time such as appropriate loading ranges can be used to minimize shock temperature effects.
Abstract: Comments regarding a paper entitled ''Effects of Shock Temperature on Biological Systems'' by J. L. Carter and W. F. Barry (1975, Proc. Paper 11239) are given. Design and operating factors other than hydraulic residence time such as appropriate loading ranges can be used to minimize shock temperature effects. In treatment plants having recycle capabilities, modification of recycle flow rate, and biosolids level or solids retention time, or both, may be used to counteract adverse shock temperature effects. In nonrecycle systems such as aerated stabilization basins, careful analysis and evaluation of hydraulic residence times using ambient air temperatures, normal operating temperature, and BOD removal rates may be required. (ND)
2 citations