Date of Award

12-2018

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Ocean Engineering and Marine Sciences

First Advisor

Robert J. Weaver

Second Advisor

George A. Maul

Third Advisor

Nezamoddin Nezamoddini-Kachouie

Fourth Advisor

Richard Aronson

Abstract

This thesis proposal outlines the development and testing of a mobile slurry treatment trailer coupled with a variable area suction head and further expands on results and procedures shown in Feasibility of Muck Removal in the IRL Watershed and Subsequent Ferrate Treatment to Remove Excess Nutrients. The purpose of this thesis is to evaluate the efficiency and effectiveness of the suction head based on the percent solids maintained during dredging. This thesis also evaluates a scaled design and associated costs for a fully scaled dredging project utilizing the suction head. Additional statistics involving further fitting sediment data to a Weibull and a Beta distribution, were also produced with a bootstrapped method of analysis. Results from testing showed reductions in coarse-grained material of roughly 83% with efficiencies attainable up to 70% and relative fines efficiencies obtained over 70% in nearly all tests. Scaled designs were also developed in which the maximum dry fines production rate of 2.15 cubic yards per hour was increased up to a maximum of 31.25 cubic yards of dry fine material an hour. In-line treatment showed positive results in further reduction of d50 as well as nitrite and nitrate, dissolved organic nitrogen, total dissolved nitrogen, phosphate, dissolved organic phosphorous, total dissolved phosphorous, and silica.

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