Title page for ETD etd-09202011-163122

Type of Document Master's Thesis
Author Radhakrishnan, Kartik
URN etd-09202011-163122
Title Impacts of the use of magnesia versus iron on mesophilic anaerobic digestion and odors in wastewater
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Novak, John T. Committee Chair
Knocke, William R. Committee Member
Little, John C. Committee Member
  • nutrient removal
  • struvite
  • biosolids
  • mesophilic anaerobic digestion
  • iron
  • magnesium
  • dewatering
  • odors
Date of Defense 2011-09-15
Availability unrestricted
Addition of iron to sewer lines for chemical phosphorus removal is widely practiced around the world. However, high dosage of iron may prove detrimental to the anaerobic digestion process and also lead to higher organic sulfur odors and deteriorating biosolids quality. The following research focuses on finding an alternative to the use of iron in wastewater systems by comparing the roles of iron and magnesium on mesophilic anaerobic digestion, the digested effluent characteristics and odors in biosolids. Three anaerobic digesters were operated, one serving as a control with no additives, and the other two having known doses of iron and magnesium added. Comparison of the effluent characteristics revealed an improvement in the overall performance of the magnesium amended digester (in terms of pH, solids and COD reduction, alkalinity and gas production) over the other two reactors, suggesting the benefits of magnesium addition. Both iron and magnesium were found to be effective in achieving high levels of phosphate removals and reducing nuisance odors in dewatered sludge cakes.
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