Articles via Databases
Articles via Journals
Online Catalog
E-books
Research & Information Literacy
Interlibrary loan
Theses & Dissertations
Collections
Policies
Services
About / Contact Us
Administration
Littman Architecture Library
This site will be removed in January 2019, please change your bookmarks.
This page will redirect to https://digitalcommons.njit.edu/theses/1451 in 5 seconds

The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title: Growth patterns of bacteria in pressurized sewage
Author: Mazzei, Dennis
View Online: njit-etd1977-005
(ix, 64 pages ~ 3.5 MB pdf)
Department: Department of Civil and Environmental Engineering
Degree: Master of Science
Program: Environmental Engineering
Document Type: Thesis
Advisory Committee: Cheng, Su Ling (Committee chair)
Golub, Eugene B. (Committee member)
Dresnack, Robert (Committee member)
Date: 1977-05
Keywords: Bacterial Growth
Sewage
Bacteria, Nitrifying
Biodegradation
Availability: Unrestricted
Abstract:

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 analysis of the combined data revealed the following: (1) pressurization increased the initial population of general bacteria by 55% and 100%, and (2) the second-stage BOD's of pressurized sewage which began three to four days earlier than that of the non-pressurized sewage was reduced by as much as 17.7%.

In addition, the effects of pressure on the population growth of nitrifying bacteria were examined. Serial 10-fold and 5-fold dilution-to-extinction techniques were use to obtain the MPN estimates of the NH4+ oxidizers group. This is a common indirect method used to enumerate the population growth of nitrosomas bacteria.

The graphs of the MPN's indicate that the population and the rate of growth of nitrosomas bacteria were greater in the pressurized sewage. Similar tests to determine the growth patterns of nitrobacter bacteria failed.

It was concluded that pressurization initiates the propagation of accelerated bacterial growth, thereby increasing the assimilative capacity of the bacteria and reducing biodegradability of sanitary sewage.


If you have any questions please contact the ETD Team, libetd@njit.edu.

 
ETD Information
Digital Commons @ NJIT
Theses and DIssertations
ETD Policies & Procedures
ETD FAQ's
ETD home

Request a Scan
NDLTD

NJIT's ETD project was given an ACRL/NJ Technology Innovation Honorable Mention Award in spring 2003