Author: Malak Sami NaguibPublisher:
ISBN:
Category : Carbon, Activated
Languages : en
Pages : 274
Book Description
Modeling the Performance of Point-of-use Activated Carbon Unit for the Removal of Disinfection By-products from Drinking Water
Author: Malak Sami NaguibPublisher:
ISBN:
Category : Carbon, Activated
Languages : en
Pages : 274
Book Description
Point-of-use Removal of Lead, Copper, and Disinfection By-products from Drinking Water Using a Phosphate, Carbonate, and Activated Carbon Bed
Author: Po-shin LoPublisher:
ISBN:
Category : Drinking water
Languages : en
Pages : 164
Book Description
Evaluation of the Effectiveness of Ten Point-of-use Domestic Activated Carbon Filtration Devices for the Removal of Four Volatile Organic Contaminants from Drinking Water
Author: Ted CottonPublisher:
ISBN:
Category : Drinking water
Languages : en
Pages : 248
Book Description
Evaluation of the Effectiveness of Four Point-of-use Domestic Activated Carbon Filtration Devices for the Removal of Four Volatile Organic Contaminants from Drinking Water
Author: Samuel Denton FaustPublisher:
ISBN:
Category : Carbon, Activated
Languages : en
Pages : 242
Book Description
Selected Water Resources Abstracts
Author: Improving Activated Carbon Performance in Point of Use and Municipal Processes
Author: Heuidae LeePublisher:
ISBN:
Category : Carbon, Activated
Languages : en
Pages : 277
Book Description
Specific inorganic and organic pollutants in water (As(V), Cr(VI), THMs, and hardness) cause health concerns or aesthetic problems. The goal of this dissertation is to demonstrate novel approaches to improve the performance of point of use and municipal activated carbon processes to provide safe and reliable water to the public at distributed centralized locations. Template Assisted Crystallization system would adjust saturation index (SI) value of TAC treated water to zero when SI value of influent water was in the range at 0.08~0.3. However, the reduction in SI when SI values were higher (e.g. 0.7~1.3) was similar to the reduction at lower SI values which could be due to limitations in kinetics or mass transfer with the template on TAC media. Pre-chlorination prior to municipal-scale granular activated carbon (GAC) treatment was evaluated to control THM formation in distribution systems. Pre-chlorination decreased UVA, shift the dissolved organic carbon (DOC) molecular weight distribution and pre-formed trihalomethanes (THM). GAC treatment of pre-chlorinated water achieved lower THM formation in distribution systems. To add functionality in POU systems to remove As(V) and Cr(VI), activated carbon was nano-tized to fabricate nano-enabled carbon block (CB) by (1) impregnating iron or titanium metal oxides chemically or (2) attaching titanium based P25 through electrostatic attraction force. Nanoparticle loadings of 5 to 10 wt % with respect to activated carbon enables reduction of As(V) or Cr(VI) from levels of common occurrence to below regulatory levels across carbon block designs. Minimal impacts on As(V) and Cr(VI) sorption were observed up to a nanoparticle pre-treatment temperature of 200 C, which is the temperature for CB production. Through controlling pH at 4.5 during mixing of nanoparticles with pH IEP=6 and activated carbon with pH IEP=3, electrostatic attachment of nanoparticles to activated carbon could be achieved prior to fabricating carbon block. A mini carbon block test device was designed, fabricated, and validated to mimic performances of full-scale carbon block using less volumes of test water. As(V) removal tests showed Fe impregnated CB achieved the highest As(V) removal while P25 attached CB had the lowest among three nanoparticles loaded CBs.
Guidance Manual for Compliance with the Filtration and Disinfection Requirements for Public Water Systems Using Surface Water Sources
Author: David J. HiltebrandPublisher:
ISBN:
Category : Law
Languages : en
Pages : 672
Book Description
This manual suggests design operating and performance criteria for specific surface water quality conditions to provide the optimum protection from microbiological contaminants.
Applications of Activated Carbon to Reduce Disinfection By-products in Small Drinking Water Systems
Author: Allyson JunkerPublisher:
ISBN:
Category :
Languages : en
Pages : 103
Book Description
The addition of chlorine disinfectant to drinking water during the treatment process results in the formation of disinfection by-products (DBPs). The United States and several other nations regulate for DBPs in drinking water because studies have linked exposure to these compounds to increased incidence of cancers as well as birth and developmental defects. Incorporation of activated carbon(AC) into the drinking water treatment process may reduce the formation of DBPs through the adsorption of natural organic matter (NOM) precursors and formed DBPs. The goal of this research project is to investigate how AC can be better used by small-scale drinking water plants as a feasible option for reducing the DBPs formed in their systems, which would allow them to consistently achieve compliance with the Environmental Protection Agency’s latest regulation Stage 2 D/DBP Rule. This research compared the factors of AC particle size, carbon source material, and concurrent coagulant addition in NOM sorption experiments. Although concurrent chemical addition and carbon source had no significant differences on AC performance, the performance of powdered activated carbon (PAC) was notably greater than granular activated carbon(GAC). Characterization of NOM in source water showed preferential adsorption of hydrophilic NOM compounds onto the AC. Finally, a pilot studied was designed to investigate the potential of granular activated carbon (GAC) to adsorb formed DBPs before entering the distribution system.
EPA Publications Bibliography
Author: United States. Environmental Protection AgencyPublisher:
ISBN:
Category : Environmental protection
Languages : en
Pages : 374
Book Description
Author: