Abstract
A laboratory study was conducted with the aim to determine the correlation between sediment characteristics and multiphase flow analysis of carrier fluid to the presence of SOD. Six sediment samples were tested on their physical and chemical characteristics along with particle size distribution of sediments to find the indication of oxygen consumption and to classify the soil sediment class. For multiphase flow analysis, there were two transition velocities calculated: the transition between a pseudo-homogenous flow and a heterogeneous flow and the limit deposit velocities at the onset of solid particle bed. The SOD test was done in laboratory-scale by using a 600-mL reactor. According to tests, the amount of organic carbon content (TOC) in the samples were ranging from 34.58 to 81.27%, with the sediments’ textures categorised as silt loam, silty clay loam, and sand. In the channels, heterogeneous flow occurred in two channel segments, while the other segments’ regime was classified as homogeneous flow. The obtained SOD values were varied from 0.2427 to 0.8487 g/m2/day with K3 values obtained ranged from 8.6537 to 12.4028 m-1. Based on all analysis, the organic characteristic of sediment holds a key role in the presence of SOD value.
Highlights
sediment oxygen demand (SOD) is the rate at which dissolved oxygen (DO) is removed from the overlying water column by biochemical processes in the streambed sediments [5]
Rounds and Doyle [8] found that the rate of SOD by 1-4 g/m2/day was still high enough to be an important component in a DO depletion
Further research using a variation of the SOD value will reaffirm the statement
Summary
SOD is the rate at which DO is removed from the overlying water column by biochemical processes in the streambed sediments [5]. SOD includes oxygen consumption of biological activity (e.g. by microorganisms in the sediment) and chemical oxidation reactions to certain chemical species, including Fe2+, Mn2+, and S2- [6]. Research on the SOD is not a new in determining water quality. Rounds and Doyle [8] found that the rate of SOD by 1-4 g/m2/day (typical SOD value of sandy sediments with little organic material) was still high enough to be an important component in a DO depletion. Et al [9] found the similar result that a minute amount of biodegradable organic compound in the sandy environment could consume oxygen significantly. The decrease in concentration DO can cause a condition called hypoxia (DO < 2 mg/L) and anoxia (no DO at all) that can affect aquatic ecology and human population due to the loss of resources and water pollution [7]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
