removal of nitrogen by nitrification denitrification

... number of prawn surviving at the time n; Ni: number of prawn at the beginning of the trial The concentrations of total ammonia nitrogen (TAN: NH3- and NH4+), nitrite nitrogen (NO2-), nitrate nitrogen ... was able to remove maximum of 65.85% of the PO43- by day 14 of the experiment Compared with the majority of other seaweeds, the performance of Sargassum in phosphate removal in this study was ... to act as a biofilter because of its capacity of nitrogen metabolism in the ocean environment (Hanson 1977, Phlips et al 1986) The aim of this study was to evaluate the efficacy of Sargassum sp...

Ngày tải lên: 21/06/2014, 05:20

... Fe(III)/Cr(III) Namasivayam of dairy (11) and coworkers from employed solutions of using containing congo fly ash and coal(g) et al (12) have of nickel of this a textile such of chlorophenol study ... The time was The equilibrium 25.7 % as dye removal indicating time and red by red mud initial with stages lapse of of time 90 uptake for all the dye of dye decreased concentrations curves monolayer ... represented of The the containing model assumes valid a surface The for finite uniform and no transmigration by the equation ‘ e -=-+ is Langmuir monolayer number of energies of of adsorbate...

Ngày tải lên: 23/09/2012, 14:47

... system, and the removal of nitrogen should be considered, too References [1] Department of Water Environment, Ministry of the Environment, Japan July 2002 Outline of Administration of Water Environment ... influence of these disturbances was found Some sampling points were selected They are the outlet of plant, the outside of experimental area, points of horizontal level and 0.5, 1.0, 1.5 m of vertical ... outlet of equipment Transparency[cm] 60 out of experimental area 50 40 30 20 10 10 15 20 25 30 35 40 45 50 Time[d] Figure Variation of Transparency Variation of COD concentration Variation of COD...

Ngày tải lên: 05/09/2013, 08:40

... of nitrogen (3mM of total nitrogen) was higher than at high level of nitrogen (11 mM of total nitrogen) Control (no N added) had a lower number of cells than the production media containing nitrogen ... support hydrogen production by photosynthetic bacteria Effect of nitrogen levels and initial acetate concentrations Continuous illumination Upon investigation of the effect of nitrogen levels and initial ... the presence of high nitrogen concentration strongly inhibited hydrogen production by photosynthetic bacteria These microorganisms produce hydrogen by the catalytic activity of nitrogenase, which...

Ngày tải lên: 05/09/2013, 09:08

... activities of nitrite oxidizing bacteria - 31 - Journal of Water and Environment Technology, Vol.5, No.1, 2007 Figure Behavior of nitrate and nitrite at the end of the aerobic tank Behavior of Nitrobacter ... with ethanol at a final concentration of 10%, then transported to the laboratory of UT at 4oCstored Then, each of the samples were divided into two One of them was for DNA extraction and was ... Journal of Water and Environment Technology, Vol.5, No.1, 2007 experiment, the authors observed the accumulation of nitrite instead of nitrate in the nitrification step In an...

Ngày tải lên: 05/09/2013, 09:38

... is one of the most important parameters to look at in column study for arsenic removal by sequential combination of LA and AC-Fe In Figure 10, at flow rate of 5mL/min or space velocity of 1.22m3/m3 ... stock solutions of As(III) were prepared from As(III) standard solution of 1003mg/L (Wako Pure Chemicals Ltd, Japan) The stock solutions of As(V) were prepared by dissolving 4.1646mg of Na2HAsO4.7H2O ... adsorbent, but AC has low arsenic removal capacity The percentage removal of As[III] by AC is just 50% (Prasenjit et al., 2007) However, it can be improved by its surface modification with metals...

Ngày tải lên: 05/09/2013, 09:38

... amounts of the chemical fertilizers of nitrogen to less than half of the previous usage amounts, which was allowed to supply with organic fertilizers Then, the amounts of nitrogen applied by chemical ... rate of TN was significantly affected by plowing of paddy soils L(R) method L(R) method was developed in order to evaluate storm-runoff loads by using precipitations in cases of limited data of ... observation of storm-runoff events is not so easy to carry out sufficient times of the observation Then, the samples of storm-runoff loads were supplemented with the storm-runoff loads calculated by using...

Ngày tải lên: 05/09/2013, 09:38

... structure of this equipment Relation of removal ability among substances As the removal ability of a substance may be affected by other substances, we investigated the correlation of reduction ... I., Feng Y W and Hitomi T.(2004) Economic Valuation of Nitrogen Removal/ Loading of Cultivated Land by a New Replacement Cost Method Journal of Japan Society on Water Environment 27(7), 491-494 ... removal is filtration at the portion of inlet and outlet and at the boundary of nylon nets bags with charcoal, and is adsorption when drainage water contacts the surface of charcoal because of...

Ngày tải lên: 05/09/2013, 09:38

... preparation of ironmodified RH was conducted in a similar way by Mondal et al (2007a) in order to modify the activated carbon by impregnation with iron for the removal of arsenic One hundred grams of ... investigate the effects of pH values within the range of 5-9, of initial arsenic concentrations within the range of 1.42 - 7.39 mg/L and of adsorbent doses within the range of 0.5 - 5.0g/L, as well ... of 5, and 9, respectively The same behavior was observed in the study by Mondal et al (2007a) for the removal of arsenic by GAC-Fe (iron-modified granular activated carbon) where percentage removal...

Ngày tải lên: 05/09/2013, 09:38

... Removal of Copper(II) and Cadmium(II) in Water by Use of Roasted Coffee Beans, J Chem Soc Japan, No 3, 459-461 (In Japanese) Petrov N., Budinova T and Khavesov I (1992) Adsorption of the ions of zinc, ... was 10 mg-Cd/L, the volume of solution was 50 mL, and the amount of charcoal was 20 mg Three days from the start of contact (concentration of cadmium was mg-Cd/L, amount of cadmium adsorbed was ... Journal of Water and Environment Technology, Vol 8, No.4, 2010 of which the contaminated water is nearby The important factors to be considered are the preparation of the adsorbent, and its removal...

Ngày tải lên: 05/09/2013, 10:15

... removed by iron nanoparticals, while only 24.75% Cr(VI) concentration was removed by iron powder Conclusion The removal of Cr(VI) by Fe0 nanoparticles was studied, the concentration of Fe0 nanoparticles ... the concentration of initial Cr(VI) After 20 minutes, the removal is 100% at concentration of 2mg/l and 69.32% at concentration of 5mg/l When treatment time increased then Cr(VI) removal efficiency ... reduction of Cr(VI) When the mass ratio of Fe0 to Cr(VI) was 50:1, 100% removal efficency was achieved pH has important effect on Cr(VI) removal efficiency, the optimal pH was from 2.5 to Cr(VI) removal...

Ngày tải lên: 14/03/2014, 10:20

... mutated After transformation of the construct into plant cells by particle bombardment, the targeting of the GFP by the transit peptide was viewed directly in living cells by confocal microscopy Similar ... material by biolistic transformation, and the location of GFP fluorescence was determined by confocal microscopy as described [19] Results Generation of fusion constructs and mutagenesis of the ... transit peptide Targeting of GFP in vivo by wild-type and mutated transit peptides of tobacco SSU The ability of the SSU transit peptides to target GFP in vivo was investigated by transient expression...

Ngày tải lên: 23/03/2014, 12:20

... promising aspects of this process for the removal of TrOCs The innovative combination of FO in combination with MBR in the form of osmotic membrane bioreactor (OMBR) for the removal of TrOCs was also ... MBR performance 90 vii 4.3.2 Removal of trace organics by MBR .92 4.3.3 Removal of trace organics by a combined MBR-NF/RO system 93 4.3.4 Performance of the NF/RO membranes 96 4.4 ... removal Develop a separation technique using FO and OMBR processes for the removal of a range of trace contaminants of concern Identify key factors that can influence the rejection of TrOCs by...

Ngày tải lên: 31/07/2014, 02:41

... uptake of food occurred in females Effects of the various level of nitrogen in food did not differentiate the height of uptake within a sex 22 T3 Fig 10 Mean consumption of food by males of Phyllobius ... in Selection and consumption of food Fig The number of feeding marks created by weevils of the genus Phyllobius on birch leaves affected by differentiated inputs of nitrogen 20 Feeding marks (pcs) ... The weight of the dry matter of birch leaves affected by the application of ammonium nitrate consumed by weevils of the genus Phyllobius the consumption of food by males and females were not...

Ngày tải lên: 07/08/2014, 10:21

... Effects of a copper deficiency The total amount of active laccase ex- by sycamore cells was closely proportional to the amount of copper initially present in the culture medium (in the range of 2-100 ... Excretion of lacsycamore (Acer pseudoplatanus L.) cells - purification and properties of the enzyme Biochem ,J 209, 489-496 Bligny case by Bligny R., Gaillard J & Douce R (1986) Excretion of laccase by ... specific activity of this T2D-laccase was reduced to 6.5 pmol of consumed/ min/mg protein, i.e., to about 20% of the normal value This indicates that the specific activity of sycamore cell laccase...

Ngày tải lên: 09/08/2014, 03:24

... HANOI UNIVERSITY OF SCIENCE TECHNISCHE UNIVERSITAT DRESDEN NGUYEN TIEN CU SIMULTANEOUS REMOVAL OF ARSENIC AND AMMONIA FROM GROUNDWATER BY PHYTOFILTRATION WITH CATTAILS (TYPHA ... dòng ra/ngày: xem bảng 2.2 Qua trình xử lý, nồng độ ammonium -nitrogen, nitrite -nitrogen nitrate -nitrogen dòng thể qua hình đây: Ammonium -Nitrogen: MỨC ĐỘ CHỊU TẢI (mg AMMONIA/NGÀY) 400 mg ammonia/ngày ... 40 3.2 Hiệu xử lý arsenic 42 3.3 Hiệu xử lý ammonia 44 3.3.1 Ammonium -Nitrogen: 44 3.3.2 Nitrite -Nitrogen: 48 3.3.3 Nitrate -Nitrogen: 49 KẾT LUẬN 51 NHẬN XÉT VÀ TRIỂN VỌNG NGHIÊN CỨU 53 TÀI LIỆU...

Ngày tải lên: 09/01/2015, 08:53

... water Plant uptake of nitrogen is one of the main processes involved in the removal of ammonia from water Removal of nitrogen through plant uptake will depend on the growth rate of the plant, culture ... Mechanisms in a Phytofiltration System c/ Mechanisms of Ammonia Uptake and Accumulation in Plants Nitrogen- compound removal processes in phytofiltration systems include nitrification and denitrification, ... elimination of not only ammonia but other contaminants ) 1.4 Phytofiltration Systems 1.4.1 Characteristics of Phytofiltration Systems a/ Phytofiltration: Phytofiltration, the use of plant with...

Ngày tải lên: 09/01/2015, 08:53

... biosorption by vvaste activated a n d digested sludges, Water Science and Technology 39 (1999) 127 Preliminary study on removal of some heavy metals (Cu2 , + Pb2 , Zn2 ) in water by biosorption ... studỵ, the heavy metal (Cu2 , Pb2* and Zn2 ) absorption capacity of Saccharomyces cerevisiae is + + •nvestigated The effect of pH of media and the concentration oi heavy metal ion are also studied ... studies The absorption of Cu2 Pb2* Zn2 ions mainly occurs during íirst hours *, + with the absorption eííiciency increased together with increasing of initial concentration of heavy metals The maximum...

Ngày tải lên: 07/08/2015, 21:55

... 36 2.2.4.1 Removal by Activated Carbon 37 2.2.4.2 Removal by Oxidation Process 38 2.2.4.3 Removal by Membrane Filtration 38 2.2.4.4 Removal by Membrane Bioreactor ... lack of fundamental understanding in terms of removal of EDCs by MBRs in a real wastewater Chapter One: Introduction matrix More specifically, the removal kinetics and capacity, effect of operational ... biodegradation of EDCs, absorption of EDCs to activated sludge and de-conjugation of EDC conjugates The study of removal mechanisms was able to gather information on the removal efficiency of EDCs and...

Ngày tải lên: 14/09/2015, 14:03

... Determination of β-carotene content 2.5 Data analysis RESULTS AND DISCUSSIONS 3.1 Effect of nitrogen source on the growth of microalgae Dunaliella sp 3.1.1 NaNO3 3.1.2 KNO3 3.1.3 Urea 11 3.2 Effect of nitrogen ... "Effect of nitrogen on biomass and β-carotene accumulation by Dunaliella sp." project was conducted to find cheaper sources of nitrogen suited for the Dunaliella sp production The objective of this ... rate of algae increased when nitrogen concentration increased, and the highest rate of growth was obtained in K3 (µ=0.247) However, in higher nitrogen concentration of K4 (8 mM), the growth of...

Ngày tải lên: 06/10/2015, 13:04