Suitable Buffer Strip Width along Rivers for Nitrate N Removal from Paddy Field Drainage

2010 ◽  
Author(s):  
Zhang Zhan-Yu ◽  
Chi Yi-Xia ◽  
Zhu Cheng-Li ◽  
Liu Jing-Jing
Keyword(s):  
Paddy Field ◽  
Strip Width ◽  
Buffer Strip ◽  
Nitrate N ◽  
N Removal ◽  
Field Drainage

Scenario analysis for reduction of effluent load from an agricultural area by recycling the run-off water

2004 ◽  
Vol 49 (3) ◽  
pp. 55-62 ◽  
Author(s):  
E. Shiratani ◽  
I. Yoshinaga ◽  
Y. Feng ◽  
H. Hasebe
Keyword(s):  
Scenario Analysis ◽  
Paddy Field ◽  
Drainage System ◽  
Paddy Fields ◽  
Agricultural Area ◽  
Recycling Rate ◽  
N Removal ◽  
Run Off ◽  
Irrigation Drainage ◽  
Field Drainage

We reviewed rates of nitrogen (N) removal in paddy fields and wetlands. Then we developed a numerical model to simulate N flow in an agricultural paddy field area and analyzed scenarios for recycling the agricultural run-off, including field drainage, from an agricultural area with an irrigation/drainage system. In it, we considered N removal in paddy fields, a regulating reservoir, and canals. The review showed that the rate constant for N removal in paddy fields and wetlands was 0.025 m/d under natural conditions and 0.01 m/d under dark conditions. The scenario analysis of recycling paddy field run-off within the model area indicated that a large amount of the effluent load occurred during the transplanting period and that recycling could reduce the effluent N load. The effluent N load would be equal to the inflowing N load at a 48% recycling rate. In this scenario, paddy fields accounted for most of the reduction in the effluent N load, and the mean removal rates per unit area of paddy field and regulating reservoir were 53.6 g ha-1d-1 and 222.6 g ha-1d-1, respectively.

scholarly journals Electrochemical redox treatment of denitrification in coastal secondary effluent using Ti/IrO2 anode

2021 ◽  
Author(s):  
Yaozong Zhang ◽  
Bo Pang
Keyword(s):  
Removal Efficiency ◽  
Treatment Plant ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Secondary Effluent ◽  
Low Carbon ◽  
Cathodic Potential ◽  
Nitrate N ◽  
N Removal ◽  
Electrochemical Redox

Abstract In northern coastal industrial park, inlet of the wastewater treatment plant (WWTP) had the characteristics of low carbon source and high chloride ion concentration, which resulted in its poor biodegradability. In this case, the experiment explored an electrochemistral method to remove nitrogen. Cathodic potential, Ti/IrO2 was confirmed as the anode and − 1.6V was taken as the potential in order to remove nitrate-N. The findings include: when the initial chloride ion was 2000 and 3000 mg/L, the effect on the removal difference of nitrogen was slight. When the electrolysis time was 60 min, ammonia-N was removed completely, nitrite-N concentration kept 1mg/L approximately. The ammonia-N removal efficiency went up with the increasing cathodic potential, and was completely removed in different water samples, but nitrate-N removal showed an opposite result. The production amount of nitrite-N was the least at -1.6V. As the pH increased, ammonia-N and nitrate-N’s removal efficiency went up first and then down, the removal effect was the best at pH being 9, Nitrite-N was less influenced by pH. After optimizing the raw water sample, Nitrate-N and TN removal efficiency were significantly increased, but the nitrite-N almost kept constant.

scholarly journals The effect of buffer strip width and selective logging on riparian forest microclimate

2019 ◽  
Vol 453 ◽  
pp. 117623 ◽  
Author(s):  
Anna Oldén ◽  
Maiju Peura ◽  
Sonja Saine ◽  
Janne S. Kotiaho ◽  
Panu Halme
Keyword(s):  
Riparian Forest ◽  
Selective Logging ◽  
Strip Width ◽  
Buffer Strip ◽  
Forest Microclimate

Bamboo as Solid Carbon Source for De-Nitrification

2013 ◽  
Vol 807-809 ◽  
pp. 1330-1335
Author(s):  
Yin Mei Wang
Keyword(s):  
Carbon Source ◽  
Solid Phase ◽  
Influencing Factor ◽  
Flow Mode ◽  
Nitrite Accumulation ◽  
N Accumulation ◽  
Nitrate N ◽  
N Removal ◽  
Single Carbon Source ◽  
As Solid Phase

This study was conducted to investigate the efficiency and characteristics of de-nitrification using bamboo as solid phase carbon source in a batch and continuous flow mode. Compared to no solid phase carbon source system, the higher nitrate-N removal efficiency and the less nitrite-N accumulation was observed in a de-nitrification system by using bamboo as solid phase carbon source. The results showed that nitrate-N volumetric load averaged between 2.09 mg/L.h when filamentous bamboo as single carbon source, and mean nitrite-N accumulations was only 0.23 mg as 1 g nitrate-N was removed. Moreover, temperature was an important influencing factor for nitrate-N volumetric load and nitrite accumulation. In addition, refractory organic compounds and nitrate-N can simultaneous remove.

scholarly journals The effect of aerated rock filter geometry on the rate of nitrogen removal from facultative pond effluents

2011 ◽  
Vol 63 (5) ◽  
pp. 841-844 ◽  
Author(s):  
R. Hamdan ◽  
D. D. Mara
Keyword(s):  
Nitrogen Removal ◽  
Ammonium Nitrogen ◽  
Horizontal Flow ◽  
Vertical Flow ◽  
Stabilization Pond ◽  
Waste Stabilization Pond ◽  
Nitrate N ◽  
N Removal ◽  
Ammonium N ◽  
Waste Stabilization

Rock filters are an established technology for polishing waste stabilization pond effluents. However, they rapidly become anoxic and consequently do not remove ammonium-nitrogen. Horizontal-flow aerated rock filters (HFARF), developed to permit nitrification and hence ammonium-N removal, were compared with a novel vertical-flow aerated rock filter (VFARF). There were no differences in the removals of BOD5, TSS and TKN, but the VFARF consistently produced effluents with lower ammonium-N concentrations (<0.3 mg N/L) than the HFARF (0.8−1.5 mg N/L) and higher nitrate-N concentrations (24–29 mg N/L vs. 17–24 mg N/L).

scholarly journals The effect of buffer strip width and selective logging on streamside plant communities

BMC Ecology ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
A. Oldén ◽  
V. A. O. Selonen ◽  
E. Lehkonen ◽  
J. S. Kotiaho
Keyword(s):  
Plant Communities ◽  
Selective Logging ◽  
Strip Width ◽  
Buffer Strip

Guiding cover crop establishment to scavenge residual soil nitrate nitrogen using site-specific approaches

2017 ◽  
Vol 8 (2) ◽  
pp. 293-298 ◽  
Author(s):  
J. H. Grove ◽  
E. M. Pena-Yewtukhiw
Keyword(s):  
Cover Crops ◽  
N Recovery ◽  
Residual Soil ◽  
Soil Nitrate ◽  
Winter Cereal ◽  
Site Specific ◽  
Nitrate N ◽  
N Concentration ◽  
N Removal ◽  
Yield Map

There is evidence that well managed winter cereal cover crops can scavenge a goodly amount of post summer cereal harvest residual nitrogen (N), reducing nitrate-N losses to leaching or runoff. The objective of this study was to compare nitrate-N phytoremediation areas derived from five sources of information: site specific, non-site specific, or a combination. The non-site specific source was a single “composite” soil nitrate sample. The site specific sources were: a) a dense soil nitrate-N grid sampling; and b) a N removal map calculated from yield and grain N concentration, both determined at the same grid density as soil nitrate-N. The source combinations were: a) a yield map and a single grain N concentration value taken from published information; and b) a yield map and a single field “composite” grain N concentration value. The results indicated that the published grain N value was inferior to measured grain N values, and that the maize (Zea mays L.) yield map best serves as a stratification tool, delineating similar crop performance areas. Random soil sampling within those areas further optimizes residual nitrate-N recovery management. Site specific technologies can guide establishment of N scavenging cover crops to simultaneously improve resource use efficiency and water quality.

Economic valuation of reduction in nitrogen outflow from a paddy field area equipped with a recycling irrigation facility

2006 ◽  
Vol 53 (2) ◽  
pp. 147-153 ◽  
Author(s):  
Y.W. Feng ◽  
E. Shiratani ◽  
I. Yoshinaga ◽  
T. Hitomi
Keyword(s):  
Paddy Field ◽  
Economic Effect ◽  
Economic Valuation ◽  
Replacement Cost ◽  
Water Quality Improvement ◽  
Irrigation Period ◽  
N Removal ◽  
Japanese Yen ◽  
The Cost ◽  
Field Area

We estimated the reduction in nitrogen outflow load from a paddy field that had a recycling irrigation facility and, by using a replacement cost method, evaluated the economic effect of nitrogen removal by the paddy field during the irrigation period in the Yoshinuma region of Tsukuba City, Japan. The recycling ratio of outflow water (proportion of outflow reused) was 13.5%. The nitrogen (N) outflow load was reduced by about 45 kg ha−1 by the N removal function of the paddy field and by about 39 kg ha−1 by the recycling irrigation facility. The paddy field equipped with a recycling irrigation facility as an N removal facility was valued at 32.6 million Japanese yen (JPY) ha−1 and 0.72 million JPY ha−1 per year, which compare it with the construction and maintenance costs, respectively, of a water quality improvement facility. The recycling irrigation facility was costed at 17.3 million JPY ha−1 for construction and 0.21 million JPY ha−1 for maintenance per year. The cost for constructing and maintaining a recycling irrigation facility was 53% of the value of the paddy field area equipped with a recycling irrigation facility as an N removal facility.

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