Environmental Engineering Commons^™

Biodegradation Of Multiple Substrates In A Batch Reactor, Nilesh Naik

Theses

The biological degradation of multiple substrates was studied at room temperature in aerated 5-liter batch reactors using mixed liquor from the Passaic Valley Sewerage Commissioners wastewater treatment plant (Newark, New Jersey).

Two substrate mixtures were used (with initial concentration indicated in parenthesis): (1) phenol(100ppm) + nitrobenzene(10ppm) + 2,6-dichiorophenol(10ppm); (2) 2-chlorphenol(20ppm) + nitrobenzene(10ppm) + 2,6-dichlorphenol(10ppm). From concentration versus time data, kinetic rate constants for zero-order, first-order, and Monod models were determined. Most of the data were best fit by either the Monod or zero-order model. For all compounds tested biodegradation was the primary removal mechanism, and in many cases the rate …

Biodegradation Of Mixed Phenolic Substrates, Prasad Gonnabathula

Theses

The biological degradation of phenol, with either 2-chlorophenol, 2,6-dichlorophenol, or nitrobenzene as cosubstrates was studied in aerated five - liter batch reactors using mixed liquor from the Passaic Valley Sewarage Commissioners wastewater treatment plant (Newark, NJ). The initial substrate concentrations were: 100 – 150 ppm phenol, 10 - 20 ppm 2-cp, 10 ppm 2,3 dcp, and 10 - 20 ppm nitrobenzene. The concentration vs. time data were fit to three kinetic models: zero-order, first-order, and Monod(assuming constant biomass). Most of the data were best fit by either the Monod or zero-order model. For all compounds tested, biodegradation was the primary …

Growth Patterns Of Bacteria In Pressurized Sewage, Dennis Mazzei

Theses

Primary sewage was pressurized at 100 psi for one hour. The effects of this pressure on the growth patterns of general and nitrifying bacteria were examined daily for eighteen consecutive days using Standard Plate Counts and Most Probable Number (MPN) estimates. In conjunction with these tests, the degree of biodegradability was also determined by measuring both daily biochemical oxygen demands (BOD's) and dissolved oxygen levels.

Graphical analysis of experimental data compare the BOD's exterted [sic] by microorganisms to their respective numbers of colonies as determined by plate counts of both pressurized and non-pressurized sanitary sewage diluted to 3. 00%. The …