Intensification of Ammonia Removal from Drinking Water with a Modified Zeolite Biological Filter Reactor

2013 ◽  
Vol 448-453 ◽  
pp. 1151-1154
Author(s):  
Hui Tang ◽  
Ming Yu Li ◽  
Zeng Hui Diao
Keyword(s):  
Drinking Water ◽  
Ammonia Concentration ◽  
Ammonia Removal ◽  
Optimal Conditions ◽  
Modified Zeolite ◽  
Optimum Operation ◽  
Outlet Concentration ◽  
Operation Conditions ◽  
Biological Filter

A novel modified zeolite bio-filter reactor was used for ammonia removal from drinking water, and inoculated nitrobacteria was combined with modified zeolite in this bio-filter reactor. The effects of various operation factors on the performance of the modified zeolite bio-filter reactor were investigated. The optimum operation conditions of the modified zeolite bio-filter reactor were obtained as follows: a HLR of 0.9 m3/ (m2.h), the temperature ranged from 15°C to 30°C, and no-aeration. Under these optimal conditions, the outlet concentration of ammonia was less than 0.5 mg/L, even when an initial ammonia concentration of 6 mg/L.

Dynamic modeling of ammonia removal at low temperatures in drinking water rapid filters

2000 ◽  
Vol 41 (4-5) ◽  
pp. 199-206 ◽  
Author(s):  
W. Uhl ◽  
R. Gimbel
Keyword(s):  
Drinking Water ◽  
Low Temperatures ◽  
Dynamic Behaviour ◽  
Ammonia Concentration ◽  
Ammonia Removal ◽  
Water Production ◽  
Raw Water ◽  
Dynamic Changes ◽  
Drinking Water Production ◽  
One Year

In drinking water production from surface water raw water quality is subject to major changes. In the case studied here, ammonia concentration varies between 0.05 and 4.2 mg/l. While at high temperatures effective ammonia removal is no problem at low temperatures ammonia breakthrough at the rapid filters can be observed. It was hypothesised that ammonia breakthrough mainly is a dynamic problem. A model was developed which takes into account the dynamic changes of attached nitrifiers due to growth, death and deposition of bacteria from the liquid phase. Backwashing was taken into account. The dynamic simulation showed that the model well describes the dynamic behaviour of the rapid filters with respect to ammonia removal over a period of one year.

ION Exchange Characterisation of Modified Zeolite

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2269-2272 ◽  
Author(s):  
Š Cerjan-Stefanovic ◽  
M. Kaštelan-Macan ◽  
T. Filipan
Keyword(s):  
Drinking Water ◽  
Ion Exchange ◽  
Anion Exchange ◽  
Natural Zeolite ◽  
Deionized Water ◽  
Isomorphous Substitution ◽  
Waste Waters ◽  
Modified Zeolite ◽  
Water Drinking

Isomorphous substitution of phosphorus into a natural zeolite affords the possibility to change the overall framework charge from negative to positive. The substances so created should be used for purification of waste waters. The work describes the preparation of phosphated zeolite, their characterisation and examples of their anion exchange of NO3 on observed in deionized water, drinking water and in the solution containing varying amounts of nitrate.

scholarly journals The extraction of total lipids from parsley: Petroselinum crispum (mill.) Nym. Ex. A.W. Hill) seeds

2004 ◽  
Vol 58 (12) ◽  
pp. 563-568 ◽  
Author(s):  
Mihajlo Stankovic ◽  
Nadica Stojanovic ◽  
Nada Nikolic ◽  
Vesna Novkovic
Keyword(s):  
Kinetic Equations ◽  
Optimal Operation ◽  
Petroselinum Crispum ◽  
Optimal Conditions ◽  
Total Lipids ◽  
Operation Conditions ◽  
Lipid Fractions ◽  
Polar Organic Solvents ◽  
Layer Chromatography ◽  
Kinetics Of

The kinetics of extraction of total lipids from ground parsley (Petroselinum crispum (Mill.) Nym. ex. A.W. Hill) seeds with a mixture of ethanol or methanol with non-polar organic solvents, chloroform, carbon tetrachloride, trichloroethylene and petroleum ether, at various temperatures were studied. The maceration technique with reflux was used. The kinetic parameters were determined in extraction kinetic equations, as well as the optimal operation conditions for total lipids extraction. The maximum total lipids yield under optimal conditions was 33.7 g per 100 g of dry parsley seeds. Nine lipid fractions of the total lipids were separated by thin layer chromatography among which were phospholipids, sterol, mono-, di- and triacylglycerol, free fatty acids and carbohydrates.

Effect of Heat Modification and Biofilm on Zeolite Adsorption Properties

2010 ◽  
Vol 439-440 ◽  
pp. 956-959 ◽  
Author(s):  
Hong Long ◽  
Jin Long Zuo
Keyword(s):  
Ion Exchange ◽  
Adsorption Capacity ◽  
Mean Value ◽  
Adsorption Properties ◽  
Ammonia Removal ◽  
Ammonium Ion ◽  
Modified Zeolite ◽  
Langmuir Isotherms ◽  
Bench Scale ◽  
And Diffusion

In order to improve ammonia removal capability from wastewater, zeolite was modified with heat and biofilm in this paper. The results showed that the adsorption capacity of heat modified zeolite could be reach mean value of 120.18meq/100g, which was 1.55 times than virgin zeolite. The results of bench scale experiments also showed that the data in the experiments were in line with Langmuir isotherms for ammonium ion absorbed onto heat modified zeolite. Moreover the biofilm which attached on the surface of heat modified zeolite only modified the surface feature of modified zeolite, while ion-exchange and diffusion procedure were not affected.

scholarly journals Levels of reactive nitrogen in surface and ground water samples obtained from different parts of Bangladesh

2014 ◽  
Vol 38 (1) ◽  
pp. 75-82 ◽  
Author(s):  
M Anowar K Parvez ◽  
Mahfuza Marzan ◽  
Syeda Moriam Liza ◽  
Zia Uddin Ahmed
Keyword(s):  
Drinking Water ◽  
Surface Water ◽  
Ground Water ◽  
Water Samples ◽  
Ammonia Concentration ◽  
Reactive Nitrogen ◽  
Tube Well ◽  
High Level ◽  
Academy Of Sciences ◽  
Different Parts

A total of 114 water samples collected from different parts of Bangladesh were analyzed for the level of reactive nitrogen species NO3 and NH3. Nitrate was determined in 20 surface water, 28 motorized deep tube well and 66 hand operated tube well samples. Ammonia was determined in 18 surface water, 14 deep tube well and 49 hand operated tube well samples. These sites were randomly selected. Nitrate levels were found to be generally low (below 3 mg/l) in 112 of the 114 samples tested, which is much below permissible level of 10 mg/l of drinking water in Bangladesh. Ammonia concentration was, however, found to be about 4 mg/l in majority of the samples tested which is higher than maximum permissible limit of 0.5 mg/l in drinking water. Possible reasons for low level of nitrate and relatively high level of ammonia in surface and ground water samples in Bangladesh is discussed DOI: http://dx.doi.org/10.3329/jbas.v38i1.20214 Journal of Bangladesh Academy of Sciences, Vol. 38, No. 1, 75-82, 2014

Above Ground Bioremediation: Two Stage Strategy for the Selection of Optimum Operation Conditions

1995 ◽  
pp. 1219-1220
Author(s):  
I. Gorostiza ◽  
M. Zallo ◽  
A. I. San Vicente ◽  
E. Quintana ◽  
I. Muguruza
Keyword(s):  
Two Stage ◽  
Optimum Operation ◽  
Operation Conditions ◽  
Selection Of

Effect of pre-ozonation on N-nitrosodimethylamine (NDMA) formation from four drinking-water sources during subsequent chloramination

2019 ◽  
Vol 19 (6) ◽  
pp. 1816-1822
Author(s):  
X. B. Liao ◽  
L. Zhao ◽  
L. L. Shen ◽  
M. Y. Chen ◽  
C. Chen ◽  
...  
Keyword(s):  
Drinking Water ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Ammonia Concentration ◽  
Quality Parameters ◽  
Water Sources ◽  
Ultraviolet Absorbance ◽  
Drinking Water Sources ◽  
The World ◽  
Doc Concentration

Abstract Ozone has been widely used for water treatment all over the world. This study investigated the effects of pre-ozonation on N-nitrosodimethylamine (NDMA) formation from four drinking-water sources during subsequent chloramination. Moreover, relationships between NDMA and water-quality parameters (dissolved organic carbon (DOC), dissolved organic nitrogen (DON), hydrophobic fractions (HFs), positive-charged fractions (PCFs), ultraviolet absorbance at 254 nm wavelength (UV254), ammonia) were determined. The results indicated that NDMA formed directly by ozonation, but the concentrations (5.7–37.8 ng/L) were much lower than during chloramination (25.3–193 ng/L). Pre-ozonation slightly augmented NDMA formation from reservoirs, while it facilitated NDMA precursor destruction in the lake and river. The river was rich in organic matter, its DOC concentration was up to 4.97 mg/L, while the DON/DOC ratio (4.68%) was low; the lake possessed the most organic nitrogen and highest DON/DOC ratio (10.76%). HFs in reservoir #2 were low (1.27 mg/L), and the HFs/DOC ratio was especially high (73.4%). PCFs constituted 48.5–72.1% of DOC. UV254 values were in the range 0.081–0.175 cm−1. The ammonia concentration was high in the lake water (0.29 mg/L), while that in reservoir #2 was only 0.08 mg/L. There was a strong correlation between NDMA formation and the removal of ammonia, DON and PCFs.

Biological pre-treatment system for ammonia removal from slightly contaminated river used as a drinking water source

2021 ◽  
Vol 147 ◽  
pp. 385-391
Author(s):  
Yi-Ju Wu ◽  
Yi-Wen Liu ◽  
Hai-Hsuan Cheng ◽  
Chih-Wen Ke ◽  
Tsair-Fuh Lin ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Source ◽  
Ammonia Removal ◽  
Treatment System ◽  
Drinking Water Source ◽  
Pre Treatment
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