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Biological removal of nitrate from d...

Darbi, Ashref.

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Biological removal of nitrate from drinking water.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Biological removal of nitrate from drinking water./
作者:	Darbi, Ashref.
面頁冊數:	229 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0336.
Contained By:	Dissertation Abstracts International65-01B.
標題:	Engineering, Civil. -
電子資源:	http://wwwlib.umi.com/dissertations/fullcit/NQ87133
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ87133
ISBN:	0612871339

Biological removal of nitrate from drinking water.
Darbi, Ashref.

Biological removal of nitrate from drinking water. - 229 p.

Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0336.

Thesis (Ph.D.)--The University of Regina (Canada), 2003.

The contamination of groundwater by excessive nitrate poses a significant public health problem and increased nitrate concentrations in groundwater have caused shutdown of wells as water sources. The objectives of the study are to evaluate the nitrate removal systems available for application in the case of prairie water supplies using groundwater; identify relevant and feasible system or systems for a more detailed investigation and development for application; and conduct laboratory and pilot studies on relevant systems.

ISBN: 0612871339Subjects--Topical Terms:

783781
Engineering, Civil.

Biological removal of nitrate from drinking water.
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245 1 0 $a Biological removal of nitrate from drinking water.
300 $a 229 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0336.
500 $a Adviser: T. Viraraghavn.
502 $a Thesis (Ph.D.)--The University of Regina (Canada), 2003.
520 $a The contamination of groundwater by excessive nitrate poses a significant public health problem and increased nitrate concentrations in groundwater have caused shutdown of wells as water sources. The objectives of the study are to evaluate the nitrate removal systems available for application in the case of prairie water supplies using groundwater; identify relevant and feasible system or systems for a more detailed investigation and development for application; and conduct laboratory and pilot studies on relevant systems.
520 $a Biological process, ion exchange and reverse osmosis (RO) were selected for this study to remove nitrate from groundwater. Laboratory and field studies for biological process, ion exchange and reverse osmosis have been completed. The sulfur/limestone autotrophic denitrification (SLAD) process was used to achieve biological removal of nitrate from groundwater.
520 $a For the column study, the optimum sulfur/limestone ratio was determined to be 2:1 (mass/mass). Different hydraulic retention times were used during the column tests to examine nitrate removal efficiencies. Under hydraulic retention time (HRT) of 13h, the initial nitrate concentration of 60 mg NO 3--N/L was reduced to less than 5 mg NO3 --N/L. On a higher HRT of 26 h the nitrate removal efficiency was close to 100% for all nitrate-nitrogen loading rates.
520 $a Kinetic studies showed that the autotrophic denitrification rates in sulfur/limestone reactors can be described by a half-order kinetics. The half-order reaction rate constants for the entire media were estimated at 1.34 and 1.54 mg1/2/L1/2 h for influent concentrations of 60 and 90 mgNO3-N/L respectively.
520 $a A study using ion exchange was conducted using two different strong base anion exchange resins (A554 and SR7). In the case of groundwater containing low sulfate concentrations, A554 offers an advantage over SR7. Both resin can remove nitrate; however, A554 has more capacity than SR7 and this agreed with the manufacturer's specification.
520 $a A reverse osmosis unit with a Filmtec membrane removed nitrate efficiently and nitrate removal efficiency and salt rejection increased with an increase of applied pressure. (Abstract shortened by UMI.)
590 $a School code: 0148.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Engineering, Environmental. $3 783782
650 4 $a Engineering, Sanitary and Municipal. $3 1018731
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690 $a 0775
690 $a 0554
710 2 0 $a The University of Regina (Canada). $3 1017617
773 0 $t Dissertation Abstracts International $g 65-01B.
790 1 0 $a Viraraghavn, T., $e advisor
790 $a 0148
791 $a Ph.D.
792 $a 2003
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856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ87133