Influence of the Initial Nitrogen Concentration on Eliminating Nitrogen Load of Europhia Sediment Capping with Active Barrier System (ABS)

2011 ◽  
Vol 374-377 ◽  
pp. 498-503
Author(s):  
Jin Lan Xu ◽  
Lei Wang ◽  
Jun Chen Kang ◽  
Ting Lin Huang ◽  
Yu Hua Dong
Keyword(s):  
Total Nitrogen ◽  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Ammonia Nitrogen ◽  
Overlying Water ◽  
Sediment Capping ◽  
Time Treatment ◽  
Total Nitrogen Concentration ◽  
Long Time ◽  
Active Barrier

Abstract: Active barrier system (ABS) capping zeolite with large surface area and strong adsorption ability is an effective way to control eutrophication of lake since it can remove ammonia in the lake released by sediment. Influence of the initial nitrogen concentration on eliminating nitrogen load of europhia sediment capping with active barrier system (ABS) were studied through an investigation of the repairment results of serious pollution period (total nitrogen concentration up to 25.33 mg/L), moderate pollution period (14.39 mg/L) and the slight pollution period (3.47 mg/L) of the ancient Canal of Yangzhou. The results showed that: (1) zeolite F1 inhibition effect is stronger than zeolite F2. More TN were removed as the initial TN concentration increased and longer rapid inhibit period were presented with the increased initial TN concentration. (2) The ammonia nitrogen in sediment could be rapidly released into the overlying water, and with lower initial TN concentration in source water, more ammonia would be released from the sediment. Long time treatment was necessary to inhibit the release of ammonia completely if the water showed a high initial TN concentration. (3) After covering zeolite, the total nitrogen in the overlying water were removed mainly through nitrification and denitrification. At the initial TN concentration of 3.47 mg/L, 14.39 mg/L, 25.88 mg/L, 61%, 45% and 52% of TN were removed by the conversion of ammonia to nitrogen gas, however, others left in water as nitrate nitrogen and nitrite residues, and 90% was nitrate nitrogen.

High-Concentration Nitrogen Removal by Anaerobic Ammonium Oxidation Process

2012 ◽  
Vol 518-523 ◽  
pp. 214-217
Author(s):  
Tao Hong Liao ◽  
Kang Huai Liu ◽  
Jia Chun Yang ◽  
Kenji Furukawa
Keyword(s):  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Nitrogen Concentration ◽  
Ammonia Nitrogen ◽  
Ammonium Oxidation ◽  
High Concentration ◽  
Total Nitrogen Concentration ◽  
Load Rate ◽  
Nitrogen Load Rate

This experiment aimed to explore the effect of high- concentration nitrogen removal by Anaerobic ammonium oxidation process. The mixed liquor suspended solid(MLSS)was 510 mg/L. In the beginning of the experiment, the inflow concentration rate of ammonia nitrogen and nitrite nitrogen was about 1:1.3 and the total nitrogen concentration was low. When the reactor reached the ideal treatment effect then gradually increased the total nitrogen concentration, until reaching the maximum nitrogen load rate(NLR) of the reactor. In the temperature of 34.4 °C, PH was 7.23, the inflow concentration of ammonia nitrogen was 223.3 mg. N/L, the inflow concentration nitrite nitrogen was 289.7 mg. N/L, the dissolved oxygen (DO) was 2.3 mg. N/L, the nitrogen load rate (NLR) was 6.08 kg. N / (m3. d), the nitrogen removal rate (NRR) was 5.60 kg. N / (m3. d), the total nitrogen (TN) removal rate was 92.2%, under this conditions, the reactor achieved the best effect.

Influence of Zeolite Dose on Eliminating Nitrogen Load of Europhia Sediment Capping with Active Barrier System (ABS)

2011 ◽  
Vol 374-377 ◽  
pp. 70-75
Author(s):  
Ting Lin Huang ◽  
Jin Lan Xu ◽  
Jun Chen Kang ◽  
Dong Dong Sun
Keyword(s):  
Good Control ◽  
Ammonia Nitrogen ◽  
Nitrite Accumulation ◽  
High Dose ◽  
Overlying Water ◽  
Sediment Capping ◽  
Removal Capacity ◽  
N Release ◽  
Active Barrier ◽  
Principal Pathway

Abstract: This study investigated to eliminate the nitrogen load of sediment from Yangzhou ancient canal capping with an active barrier system (ABS) using two kinds of zeolite with five different coverage densities. For ABS capping with zeolite F1 when the zeolite dose is low (0.21 kg/m2 and 0.62 kg/m2), it is found that ABS failed to achieve good control in preventing N release in the entrophic sediments as total nitrogen (TN) concentrations of overlying water were increased to 3.76 mg/L and 3.13 mg/L, respectively after 16 days. However, when zeolite density was increased to 1.04 kg/m2, TN concentration of overlying water decreased to 1.94 mg/L and TN removal efficiency is up to 50% after 16 days. For ABS capping with zeolite F2 TN concentration of overlying water is reported to descend in both low dose and high dose series. It is found that zeolite F2 is unfit for remediation of sediments from ancient Canal in Yangzhou because the ability in preventing release of ammonia nitrogen from sediments is weak. A possible explanation is that microorganism attaching on surface of two zeoltes differs to cause large difference of removal capacity between zeolite F1 and zeolite F2. It is found that nitrification and denitrification is the principal pathway for the former one while nitrite accumulation appears in the latter. To sum up, the capacity of eliminating TN load by zeolite F1 is stronger than that by zeolite F2, the optimum capping density of zeolite F1 is 1.04 kg/m2.

Effect of the Type of Zeolite on Eliminating Nitrogen Load of Europhia Sediment Capping with Active Barrier System (ABS)

2011 ◽  
Vol 374-377 ◽  
pp. 1141-1146
Author(s):  
Jin Lan Xu ◽  
Ai Ping Liu ◽  
Jun Chen Kang ◽  
Ting Lin Huang ◽  
Yu Hua Dong ◽  
...  
Keyword(s):  
Ammonia Nitrogen ◽  
Release Rates ◽  
Overlying Water ◽  
Total N ◽  
Barrier Materials ◽  
Sediment Capping ◽  
N Removal ◽  
Consumption Rates ◽  
Active Barrier ◽  
High Level

Abstract: The application of an active zeolite barrier was investigated to improvement of eutrophication in the ancient Canal. For this, four types of zeolites (diameter: 1～2 mm) were applied in order to investage effect of the type of zeolite on N removal. The dosage of the zeolites was 1.46 kg.m-2 and the ammonium concentrations in overlying water were 3.47 mg/L. It is found that the capacity of elimination total N of the four zeolites was significant and decreased with the following order: Haiyu zeolite F1 > Aolin zeolite F2 > Natural zeolite F3 > Calcium zeolite F4. In addition, the results show that zeolite F1 and F2 belong to N inhibiting type as TN concentration of overlying water quickly reduced to 2.53 mg/L, 3.7 mg/L, and the corresponding removal efficiency of TN is as high as 56% and 35.6% after covering zeolite F1 and F2. The results indicated that the consumption rates of ammonia nitrogen in this system is greater than or equal to release rates of ammonia from sediment. However, TN concentration of overlying water still rise to high level (1.57 times of initial TN) when covering zeolite F3 and F4 (N non-inhibited type). Therefore, it is considered that the Haiyu zeolite should be the best barrier materials to clean sediment of the ancient Canal.

Total nitrogen concentration in leaves of potatoes (Solanum tuberosumL.) as an index of nutritional status

1976 ◽  
Vol 87 (2) ◽  
pp. 293-296 ◽  
Author(s):  
A. Gupta ◽  
M. C. Saxena
Keyword(s):  
Total Nitrogen ◽  
Tuber Yield ◽  
Critical Concentration ◽  
Nitrogen Concentration ◽  
Curvilinear Relationship ◽  
N Application ◽  
Total N ◽  
Potato Plants ◽  
N Concentration ◽  
Total Nitrogen Concentration

SummaryLeaf samples were collected, at weekly intervals, throughout the growing season, from potato (Solanum tuberosumL.) plants supplied with varying amounts of nitrogen (0, 60, 120, 180 and 240 kg N/ha) and analysed for total N. Application of nitrogen increased the N concentration in the green leaves at all stages of growth. There was a significant curvilinear relationship between the final tuber yield and the total N concentration in the leaves at 48–90 days after planting in 1968–9 and at 79–107 days after planting in 1969–70. The N concentration at 70–90 days after planting was consistently related to the final tuber yield in both years. Thus this period was ideal for assessing the nitrogen status of potato plants. The critical concentration of total nitrogen generally decreased with advance in age. It ranged from 4·65% at 76 days to 3·30% at 90 days during 1968–9, whereas in 1969–70 it ranged from 4·20% at 79 days to 3·80% at 93 days. During the period from 83 to 86 days the critical percentage was around 3·6% in both the years.

Impact of chloride on nitrate absorption and accumulation by broccoli (Brassica oleracea var. italica)

1996 ◽  
Vol 76 (2) ◽  
pp. 367-377 ◽  
Author(s):  
Liangxue Liu ◽  
Barry J. Shelp
Keyword(s):  
Brassica Oleracea ◽  
Total Nitrogen ◽  
Nitrogen Concentration ◽  
Xylem Sap ◽  
Phloem Exudate ◽  
Nitrate Accumulation ◽  
Total Nitrogen Concentration ◽  
Nitrate Absorption ◽  
Final Yield ◽  
Chloride Treatment

In the present study, we tested the hypothesis that continuous chloride treatment decreases nitrate absorption and accumulation by broccoli (Brassica oleracea var. italica) plants. In a field experiment, both fresh and dry weights of shoot and inflorescence increased linearly with increasing nitrogen applied (70–130 kg ha−1). Chloride application (0–450 kg ha−1) did not significantly affect the final yield. In a greenhouse experiment in which the plants were grown in soilless culture and supplied with 10–18 mmol L−1 nitrate, only the fresh weights of shoot and inflorescence decreased linearly with increasing chloride application (0–45 mmol L−1). In both experiments, increasing chloride application slightly decreased the concentrations of nitrate nitrogen and total nitrogen in xylem sap, and increased the chloride concentrations of both xylem sap and phloem exudate and the total-nitrogen concentration of phloem exudate. The shoot-nitrate contents increased with increasing nitrogen application and decreased with increasing chloride application, whereas the shoot-chloride contents increased with increasing chloride application and decreased with increasing nitrate application. The total-nitrogen contents of the shoot were not affected by chloride application. These data are interpreted to suggest that nitrate absorption was not inhibited by the presence of chloride in the growing medium and that the decrease in nitrate accumulation of the shoot resulted from the stimulation of organic-nitrogen formation from absorbed nitrate. Key words: Antagonism, broccoli, chloride, interaction, nitrate

scholarly journals LEAF TOTAL NITROGEN CONCENTRATION AS AN INDICATOR OF NITROGEN STATUS FOR PLANTLETS AND YOUNG PLANTS OF EUCALYPTUS CLONES

2015 ◽  
Vol 39 (4) ◽  
pp. 1127-1140 ◽  
Author(s):  
Eric Victor de Oliveira Ferreira ◽  
Roberto Ferreira Novais ◽  
Bruna Maximiano Médice ◽  
Nairam Félix de Barros ◽  
Ivo Ribeiro Silva
Keyword(s):  
Total Nitrogen ◽  
Block Design ◽  
Nitrogen Concentration ◽  
Soil N ◽  
Total N ◽  
Chlorophyll Meter ◽  
N Concentration ◽  
Total Nitrogen Concentration ◽  
N Status ◽  
Leaf N

The use of leaf total nitrogen concentration as an indicator for nutritional diagnosis has some limitations. The objective of this study was to determine the reliability of total N concentration as an indicator of N status for eucalyptus clones, and to compare it with alternative indicators. A greenhouse experiment was carried out in a randomized complete block design in a 2 × 6 factorial arrangement with plantlets of two eucalyptus clones (140 days old) and six levels of N in the nutrient solution. In addition, a field experiment was carried out in a completely randomized design in a 2 × 2 × 2 × 3 factorial arrangement, consisting of two seasons, two regions, two young clones (approximately two years old), and three positions of crown leaf sampling. The field areas (regions) had contrasting soil physical and chemical properties, and their soil contents for total N, NH+4-N, and NO−3-N were determined in five soil layers, up to a depth of 1.0 m. We evaluated the following indicators of plant N status in roots and leaves: contents of total N, NH+4-N, NO−3-N, and chlorophyll; N/P ratio; and chlorophyll meter readings on the leaves. Ammonium (root) and NO−3-N (root and leaf) efficiently predicted N requirements for eucalyptus plantlets in the greenhouse. Similarly, leaf N/P, chlorophyll values, and chlorophyll meter readings provided good results in the greenhouse. However, leaf N/P did not reflect the soil N status, and the use of the chlorophyll meter could not be generalized for different genotypes. Leaf total N concentration is not an ideal indicator, but it and the chlorophyll levels best represent the soil N status for young eucalyptus clones under field conditions.

EFFECT OF UREA AND AMMONIUM NITRATE ON YIELDS AND NITROGEN CONCENTRATION OF TIMOTHY AND BROMEGRASS AND LOSS OF AMMONIA FROM UREA SURFACE APPLICATIONS

1987 ◽  
Vol 67 (1) ◽  
pp. 185-192 ◽  
Author(s):  
H. T. KUNELIUS ◽  
J. A. MACLEOD ◽  
K. B. MCRAE
Keyword(s):  
Ammonium Nitrate ◽  
Total Nitrogen ◽  
Dry Matter ◽  
Field Experiments ◽  
Nitrogen Concentration ◽  
Secondary Growth ◽  
Nitrogen Sources ◽  
Primary Growth ◽  
Total Nitrogen Concentration ◽  
Harvest Year

Urea and ammonium nitrate were applied at 30, 60, 90 and 120 kg N ha−1 in spring and after cutting the primary growth of timothy and bromegrass in three field experiments. Dry matter yields of timothy and bromegrass and total nitrogen concentration of tissue and nitrogen yields of timothy were determined. Loss of nitrogen as ammonia was monitored on microplots between the end of May and early July. Primary growth yields were usually similar for ammonium nitrate and urea but in the secondary growth timothy fertilized with ammonium nitrate outyielded timothy fertilized with urea in four out of six harvest years. Dry matter response to applied nitrogen was usually curvilinear in primary growth but linear in secondary growth over the nitrogen rates studied. Total nitrogen concentration in primary and secondary growths of timothy increased linearly with nitrogen rate during the initial 2–3 yr; ammonium nitrate and urea were equally effective in all but one harvest year. Total nitrogen production of timothy also increased linearly over the range of 30–120 kg N ha−1, while ammonium nitrate outyielded urea-fertilized timothy during one season in primary and two seasons out of four in secondary growth. Nitrogen losses increased from spring to summer, in general, with 68–75% of the variation explained by air temperature. Urea and ammonium nitrate were considered equivalent nitrogen sources for the primary growth of timothy but urea was less efficient in the secondary growth under summer conditions.Key words: Urea, ammonium nitrate, timothy, bromegrass, ammonia losses

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