Nitrate removal from drinking water in a fluidized-bed biological denitrification bioreactor

1987 ◽  
Vol 7 (5) ◽  
pp. 417-423 ◽  
Author(s):  
J. Holló ◽  
L. Czakó
Keyword(s):  
Drinking Water ◽  
Fluidized Bed ◽  
Nitrate Removal ◽  
Biological Denitrification ◽  
Denitrification Bioreactor

Nitrate Removal of Fluidized-Bed Biofilm Reactors Using Starch / Polyvinyl Alcohol Blends as Carbon Source and Carrier Simultaneously at Low Temperature

2014 ◽  
Vol 501-504 ◽  
pp. 2089-2092
Author(s):  
Hai Hong Zhou ◽  
Fang He
Keyword(s):  
Drinking Water ◽  
Controlled Release ◽  
Low Temperature ◽  
Carbon Source ◽  
Polyvinyl Alcohol ◽  
Fluidized Bed ◽  
Nitrate Concentration ◽  
Nitrate Removal ◽  
Biofilm Reactors ◽  
Resident Time

A kind of controlled-release carbon source, starch / polyvinyl alcohol blends (SPVA), was used as both carbon source and biofilm supporter in laboratory-scale fluidized-bed biofilm reactors (FBBRs) to remove nitrate from groundwater. Results show: when the influent nitrate concentration was 100 mg-N /L, FBBRs packed with SPVA can effectively remove nitrate from groundwater at the condition of temperature 20 °C, hydraulic resident time (HRT) 4 h. The effluent nitrate can meet with the Chinese drinking water standards at low temperature (15-2 °C) by adjusted the HRT of FBBRs. The denitrification rate declined nonlinearly with the decrease of temperature and changed sharply in the range of 20-15 °Cand 10-5 °C.

Removal of microcystin-LR from drinking water with TiO2-coated activated carbon

2004 ◽  
Vol 4 (5-6) ◽  
pp. 21-28
Author(s):  
S.-C. Kim ◽  
D.-K. Lee
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Synergistic Effect ◽  
Fluidized Bed ◽  
Continuous Flow ◽  
High Surface ◽  
High Surface Area ◽  
Fluidized Bed Reactor ◽  
Exterior Surface ◽  
Tio2 Particles

TiO2-coated granular activated carbon was employed for the removal of toxic microcystin-LR from water. High surface area of the activated carbon provided sites for the adsorption of microcystin-LR, and the adsorbed microcystin-LR migrated continuously onto the surface of TiO2 particles which located mainly at the exterior surface in the vicinity of the entrances of the macropores of the activated carbon. The migrated microcystin-LR was finally degraded into nontoxic products and CO2 very quickly. These combined roles of the activated carbon and TiO2 showed a synergistic effect on the efficient degradation of toxic microcystin-LR. A continuous flow fluidized bed reactor with the TiO2-coated activated carbon could successfully be employed for the efficient photocatalytic of microcystin-LR.

Optimal operations for groundwater denitrification of drinking water using heterotrophic biological denitrification process

2006 ◽  
Vol 6 (2) ◽  
pp. 125-130
Author(s):  
C.-H. Hung ◽  
K.-H. Tsai ◽  
Y.-K. Su ◽  
C.-M. Liang ◽  
M.-H. Su ◽  
...  
Keyword(s):  
Drinking Water ◽  
Removal Efficiency ◽  
Nitrate Removal ◽  
Drinking Water Treatment ◽  
Nitrate Content ◽  
Source Water ◽  
Nitrogen Gas ◽  
Negative Effect ◽  
Denitrification Process ◽  
Heterotrophic Denitrification

Due to the extensive application of artificial nitrogen-based fertilizers on land, groundwater from the central part of Taiwan faces problems of increasing concentrations of nitrate, which were measured to be well above 30 mg/L all year round. For meeting the 10 mg/L nitrate standard, optimal operations for a heterotrophic denitrification pilot plant designed for drinking water treatment was investigated. Ethanol and phosphate were added for bacteria growing on anthracite to convert nitrate to nitrogen gas. Results showed that presence of high dissolved oxygen (around 4 mg/L) in the source water did not have a significantly negative effect on nitrogen removal. When operated under a C/N ratio of 1.88, which was recommended in the literature, nitrate removal efficiency was measured to be around 70%, sometimes up to 90%. However, the reactor often underwent severe clogging problems. When operated under C/N ratio of 1.0, denitrification efficiency decreased significantly to 30%. Finally, when operated under C/N ratio of 1.5, the nitrate content of the influent was almost completely reduced at the first one-third part of the bioreactor with an overall removal efficiency of 89–91%. Another advantage for operating with a C/N ratio of 1.5 is that only one-third of the biosolids was produced compared to a C/N value of 1.88.

scholarly journals Design of fluidized-bed, biological denitrification systems

1982 ◽  
Author(s):  
B.D. Patton ◽  
C.W. Hancher ◽  
W.W. Pitt ◽  
J.F. Walker
Keyword(s):  
Fluidized Bed ◽  
Biological Denitrification

Biological denitrification of drinking water using various natural organic solid substrates

2004 ◽  
Vol 48 (11-12) ◽  
pp. 489-495 ◽  
Author(s):  
S. Aslan ◽  
A. Türkman
Keyword(s):  
Drinking Water ◽  
Carbon Source ◽  
Wheat Straw ◽  
Nitrate Removal ◽  
Solid Particles ◽  
Effluent Water ◽  
Activated Carbon Adsorption ◽  
Organic Solid ◽  
Solid Substrates ◽  
Laboratory Reactor

Denitrification of drinking water was studied using various natural organic solid substrates (NOSS) such as poplar, hornbeam, pine shavings and wheat straw as a carbon source in a batch unit. The highest nitrate removal efficiency was observed with the wheat straw, so it was chosen as the carbon source for biodenitrification in an upflow laboratory reactor. In order to remove solid particles from the effluent water, a sand filter unit was placed after the denitrification reactor. The soluble DOC contents in the reactor affected the efficiency of nitrate elimination and nitrate concentration of the effluent water remained below acceptable values (50 mg/l NO3-). In order to remove colour, DOC and nitrate from the water, powdered activated carbon adsorption studies were performed in the batch unit.

scholarly journals Impact of Temperature on Biological Denitrification Process

1970 ◽  
Vol 7 (1) ◽  
pp. 121-126 ◽  
Author(s):  
Iswar Man Amatya ◽  
Bhagwan Ratna Kansakar ◽  
Vinod Tare ◽  
Liv Fiksdal
Keyword(s):  
Filtration Rate ◽  
Nitrate Nitrogen ◽  
Nitrate Removal ◽  
Biological Method ◽  
Biological Denitrification ◽  
Nitrite Nitrogen ◽  
Nitrogen Concentrations ◽  
In Series ◽  
Nitrate And Nitrite ◽  
Denitrification Process

Nitrate removal in groundwater was carried out by biological method of denitrification process. The denitrification and without denitrification were performed in two different sets of reactors. Each reactor consists of two columns connected in series packed with over burnt bricks as media. The filtration rate varied from 5.3 to 52.6 m/day for denitrification process. The ammonia, nitrate and nitrite nitrogen concentrations were measured at inlet, intermediate ports and outlet. The temperature varied from 10 to 30°C at 2°C intervals. The results demonstrated that high amount of nitrate nitrogen removed in groundwater at denitrification process. The nitrate nitrogen removed by denitrification varied from 3.50 to 39.08 gm/m3/h at influent concentration from 6.32 to 111.04 gm/m3/h. Denitrification was found more significant above 16°C.Key words: Over burnt brick, Denitrification, Filtration rate and TemperatureJournal of the Institute of Engineering, Vol. 7, No. 1, July, 2009 pp. 121-126doi: 10.3126/jie.v7i1.2070 

Denitrification with isopropanol as a carbon source in a biofilm system

1994 ◽  
Vol 30 (11) ◽  
pp. 69-78 ◽  
Author(s):  
Yongwoo Hwang ◽  
Hiroshi Sakuma ◽  
Toshihiro Tanaka
Keyword(s):  
Carbon Source ◽  
Nitrate Removal ◽  
Growth Yield ◽  
Pilot Scale ◽  
Denitrification Rate ◽  
Hydrogen Donor ◽  
Microbial Oxidation ◽  
Biological Denitrification ◽  
Batch Tests

Several batch tests and pilot-scale investigations on biological denitrification with isopropanol were performed. Isopropanol was converted to acetone by microbial oxidation during denitrification. Isopropanol itself little contributed to denitrification in practice while the converted acetone played a role of a main hydrogen donor. A larger quantity of nitrite intermediate was formed by using methanol compared to the case of isopropanol. The measured requirement of isopropanol was 2.0 mg mg−1 NO3-N, and was 2/3 of methanol. The oxygen equivalent of isopropanol for nitrate removal was almost the same as that of methanol. The denitrifier net growth yield for isopropanol was greater than for methanol. In order to maximize the denitrification rate, it is essential to convert isopropanol to acetone rapidly by accurate dosing for nitrogen load because the denitrification rate was accelerated by using acetone only. Excessive dose of isopropanol can cause a decrease in the denitrification rate as well as an increase of BOD in the effluent.

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