Document Type
Thesis
Date of Award
5-31-1990
Degree Name
Master of Science in Environmental Engineering - (M.S.)
Department
Civil and Environmental Engineering
First Advisor
Yeun C. Wu
Second Advisor
Paul N. Cheremisinoff
Abstract
The wastewater generated from installation factories contains high suspended solids ( SS ) and oil. Effective removal of oil and clay particles in washrack wastewater can be achieved by using organic polymer TFL-398 alone or in conjunction with alum. The dissolved/emulsified oil concentration and suspended solids are used to represent the degree of oil demulsification and clay particles destabilization, respectively.
To improve the efficiency of oil demulsification and reduce the chemical consumption, pretreatment of the influent wastewater is essentially necessary. pH adjustment to 11-12 generally reduces chemical requirement. Total oil concentration was reduced significantly at pH = 11.7 without any chemical addition. At this pH value, the petroleum hydrocarbons are converted to hydrophilic compounds which can no longer be extracted with organic solvents.
Flow recycle by mixing treated wastewater and raw wastewater also reduces chemical consumption. By utilizing TFL-398 alone at pH = 11.7, and flow recycle ratio of 1.5 or greater, the polymer dose of 200 mg/l can remove 95% of oil and 99.5% of clay particles. The polymer demand can be reduced to as low as 25 mg/1 in conjuction with alum dosage of 1,000 mg/l at pH = 7.0.
Recommended Citation
Tai, Fong-Jung, "Demulsification and separation of oil in a water/particulate system" (1990). Theses. 2963.
https://digitalcommons.njit.edu/theses/2963
