| Main Title |
Zoomicrobial Indicators of Water Pollution. |
| Author |
Chang., Shin L. ;
|
| CORP Author |
National Environmental Research Center, Cincinnati, Ohio |
| Year Published |
1972 |
| Stock Number |
PB-260 126 |
| Additional Subjects |
Water pollution sampling ;
Biological indicators ;
Aquatic ecosystems ;
Microorganisms ;
Zooplankton ;
Indicator species ;
Effluents ;
Algae ;
Water quality ;
Waste treatment ;
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB-260 126 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
21p |
| Abstract |
The history of the devleopment of a pollution index on the basis of zoomicrobial contents of surface waters is reviewed. Various methods proposed for determining the biological index of pollution were based on changes in microbial composition of waters in a self-purification process after discharge of raw sewage; they are unsuitable for measuring the levels of pollution by effluents from waste treatment plants because the microbial population changes in receiving waters are quantitative rather than qualitative. Since clean or remotely polluted waters predominantly contain algae with a steady increase in protozoa-nematode content with pollution, a ZPI and its formula are presented that has been successful in judging the desirability of the waste treatment. |
| PUB Date Free Form |
1972 |
| Category Codes |
13B |
| NTIS Prices |
PC A02/MF A01 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
323705852 |
| Origin |
NTIS |
| Type |
CAT |
