Date of Award

Spring 1998

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)


Civil and Environmental Engineering

First Advisor

Zitomer, Daniel

Second Advisor

Zanoni, Alphonse E.

Third Advisor

Novotny, Vladimir


It is well known and documented that the macronutrients nitrogen and phosphorous are required for proper microorganism growth and metabolism. Therefore, it is common practice to add these nutrients to deficient waste streams to ensure effective treatment of industrial wastewaters. Micronutrients such as potassium, copper, manganese, magnesium and zinc are not commonly supplemented in the activated sludge process; however, they are required for optimum microbiological growth and metabolism. The addition of micronutrients into the wastestrearn may enhance the growth of microorganisms, promote bioflocculation and improve sludge settleability. Thus, micronutrient supplementation is suggested as a viable, cost-effective method for reduction of sludge volume and enhancement of sludge settleability under some conditions. This study involved adding selected organic and inorganic micronutrients to a paper mill primary effluent and studying the effects on the sludge volume index (SVI), and other parameters using laboratory bench-scale reactors. The objective of this research was to enhance activated sludge settleability by adding trace nutrients.



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