Nitrate removal from drinking water using combined ion exchange/ resin bioregeneration
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Ebrahimi, Shelir
issued: 2015-12-02T04:31:42
issued: 2015
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Nitrate contamination is a drinking water concern in many areas in the world, especially rural communities. Excess nitrate can cause several environmental and health problems. The maximum acceptable concentration of nitrate in drinking water is set to be 45 mg /L as nitrate by USEPA. One of the most common methods for nitrate removal from water is ion exchange using nitrate selective resins. Although these resins have a great capacity for nitrate removal, they are considered non regenerable. The ability to regenerate these resins multiple times will increase the environmental and economic sustainability of nitrate-contaminated water treatment processes. This dissertation tests the hypothesis that multi-cycle exhaustion/ bioregeneration of resin enclosed in a membrane is feasible and temperature and salt concentration in the medium will have an influence on the processes involved. The results showed that this method is an effective and innovative resin regeneration method. Applying 6 cycles of resin exhaustion/ regeneration showed that resin could be used for 4 cycles without a loss of capacity, after 6 cycles only 6% of the capacity was lost. A pseudo-second order kinetic equation described the nitrate desorption analysis well. The initial desorption rates of nitrate from the resin in a membrane were significantly different at different salt concentrations and temperatures; maximum of 306±21 mg of nitrate/g of resin. h for 6% at 35 °C and minimum of 42±3 mg of nitrate/g of resin. h at 2% salt and 12 °C . The effect of different salt concentrations on the biological nitrate removal rate was dependent on the temperature; within each group of temperatures, the nitrate degradation rate decreased with increasing the salt concentration. ðððð ( ðð ððð¡ððð¡ð/ðð ððð.âð)=0.0102+(0.00114Ãððððððððððð)â(0.000291Ãðððð) fit the data for the effect of salt concentration and temperature on nitrate degradation rate with the best correlation (R² = 0.93). The results from the kine…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/55631
note: NITRATE REMOVAL FROM DRINKING WATER USING COMBINED ION-EXCHANGE/ RESIN BIOREGENERATION by Shelir Ebrahimi BSC., (Chemical Engineering) Amirkabir University of Technology, Iran. 2006 MSC., (Chemical- Environmental Engineering) Sharif University of Technology, Iran. 2008 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE COLLEGE OF GRADUATE STUDIES (Civil Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) November 2015 © Shelir Ebrahimi, 2015 ii Abstract Nitrate contamination is a drinking water concern in many areas in the world, especially rural communities. Excess nitrate can cause several environmental and health problems. The maximum acceptable concentration of nitrate in drinking water is set to be 45 mg /L as nitrate by USEPA. One of the most common methods for nitrate removal from water is ion exchange using nitrate selective resins. Although these resins have a great capacity for nitrate removal, they are considered non regenerable. The ability to regenerate these resins multiple times will increase the environmental and economic sustainability of nitrate-contaminated water treatment processes. This dissertation tests the hypothesis that multi-cycle exhaustion/ bioregeneration of resin enclosed in a membrane is feasible and temperature and salt concentration in the medium will have an influence on the processes involved. The results showed that this method is an effective and innovative resin regeneration method. Applying 6 cycles of resin exhaustion/ regeneration showed that resin could be used for 4 cycles without a loss of capacity, after 6 cycles only 6% of the capacity was lost. A pseudo-second order kinetic equation described the nitrate desorption analysis well. The initial desorption rates of nitrate from the resin in a membrane were significantly different at different salt concentrations and temperatures; maximum of 306±21 mg of nitrate/g of resin. h for 6% at 35 °C and minimum of 4…
has type: Thesis/Dissertation
date issued: 2016-02
is shown at: 10.14288/1.0220753
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivs 2.5 Canada
rights URI: http://creativecommons.org/licenses/by-nc-nd/2.5/ca/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/55631