Corrigendum: Water Science and Technology: Water Supply 18 (4), 1183-1195: Bottom-to-top continuous irrigation of treated municipal wastewater for effective nitrogen removal and high quality rice for animal feeding, Dong Duy Pham et al.

2018 ◽  
Vol 19 (1) ◽  
pp. 346-346
Author(s):  
Dong Duy Pham ◽  
Sumiko Kurashima ◽  
Nobuo Kaku ◽  
Jian Pu ◽  
Toru Watanabe ◽  
...  
Keyword(s):  
Water Supply ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Science And Technology ◽  
High Quality ◽  
Continuous Irrigation ◽  
Animal Feeding ◽  
Treated Municipal Wastewater ◽  
Water Science ◽  
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Bottom-to-top continuous irrigation of treated municipal wastewater for effective nitrogen removal and high quality rice for animal feeding

2017 ◽  
Vol 18 (4) ◽  
pp. 1183-1195 ◽  
Author(s):  
Dong Duy Pham ◽  
Sumiko Kurashima ◽  
Nobuo Kaku ◽  
Atsushi Sasaki ◽  
Jian Pu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Animal Feed ◽  
Brown Rice ◽  
Dry Mass ◽  
Continuous Irrigation ◽  
Animal Feeding ◽  
Treated Municipal Wastewater ◽  
Bottom To Top

Abstract A bench-scale experiment to cultivate rice for animal feeding with continuous irrigation of treated municipal wastewater (TWW) in six different conditions was carried out to examine nitrogen removal from TWW, yield and quality of harvested rice, and accumulation of heavy metals in soil and rice grains. A microbial fuel cell (MFC) system comprising graphite felt electrodes was also installed to generate electricity in the paddy field. The highest rice yield (9.0 ton/ha), dry mass (12.4 ton/ha), and protein content (13.1%), an important nutrient in animal feed, were obtained when a bottom-to-top irrigation (TWW was supplied to the underdrain pipe) was applied at the highest flow rate. The bottom-to-top irrigation achieved 79 to 91% removal of nitrogen in TWW, which was much higher than the top-to-top irrigation (58%). No accumulation of heavy metals was found in the experimental soils, and heavy metal concentrations in brown rice were lower than the allowable levels of current standards. The electric output from the MFC system was much lower than that reported in normal paddy fields, probably due to the poor connection between cables and electrodes. Further study is necessary to improve the electricity generation and to continuously monitor heavy metals in brown rice and the soil.

scholarly journals Nitrogen removal and power generation from treated municipal wastewater by its circulated irrigation for resource-saving rice cultivation

2016 ◽  
Vol 75 (4) ◽  
pp. 898-907 ◽  
Author(s):  
Toru Watanabe ◽  
Takuma Mashiko ◽  
Rizki Maftukhah ◽  
Nobuo Kaku ◽  
Dong Duy Pham ◽  
...  
Keyword(s):  
Power Generation ◽  
Plant Growth ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Animal Feed ◽  
Soil Layer ◽  
Treated Wastewater ◽  
Resource Saving ◽  
Treated Municipal Wastewater ◽  
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This study aims at improving the performance of the cultivating system of rice for animal feed with circulated irrigation of treated municipal wastewater by applying a larger amount of wastewater, as well as adding a microbial fuel cell (MFC) to the system. The results of bench-scale experiments indicate that this modification has increased the rice yield, achieving the target for the rice cultivar used in the experiment. In addition, an assessment of protein content of the harvested rice showed that the value of the rice as animal fodder has improved. Compared with normal one-way irrigation, circulated irrigation significantly enhanced the plant growth and rice production. The direction of the irrigation (bottom-to-top or top-to-bottom) in the soil layer had no significant effect. This modified system demonstrated >96% for nitrogen removal from the treated wastewater used for the irrigation, with approximately 40% of the nitrogen being used for rice plant growth. The MFC installed in the system facilitated power generation comparable with that reported for normal paddy fields. The power generation appeared to be enhanced by bottom-to-top irrigation, which could provide organic-rich treated wastewater directly to the bacterial community living on the anode of the MFC set in the soil layer.

Cultivation of rice for animal feed with circulated irrigation of treated municipal wastewater for enhanced nitrogen removal: comparison of cultivation systems feeding irrigation water upward and downward

2015 ◽  
Vol 72 (4) ◽  
pp. 579-584 ◽  
Author(s):  
A. Muramatsu ◽  
H. Ito ◽  
A. Sasaki ◽  
A. Kajihara ◽  
T. Watanabe
Keyword(s):  
Nitrogen Removal ◽  
Irrigation Water ◽  
Rice Plant ◽  
Municipal Wastewater ◽  
Animal Feed ◽  
Paddy Fields ◽  
Treated Wastewater ◽  
Human Consumption ◽  
Cultivation System ◽  
Treated Municipal Wastewater

To achieve enhanced nitrogen removal, we modified a cultivation system with circulated irrigation of treated municipal wastewater by using rice for animal feed instead of human consumption. The performance of this modified system was evaluated through a bench-scale experiment by comparing the direction of circulated irrigation (i.e. passing through paddy soil upward and downward). The modified system achieved more than three times higher nitrogen removal (3.2 g) than the system in which rice for human consumption was cultivated. The removal efficiency was higher than 99.5%, regardless of the direction of circulated irrigation. Nitrogen in the treated municipal wastewater was adsorbed by the rice plant in this cultivation system as effectively as chemical fertilizer used in normal paddy fields. Circulated irrigation increased the nitrogen released to the atmosphere, probably due to enhanced denitrification. Neither the circulation of irrigation water nor its direction affected the growth of the rice plant and the yield and quality of harvested rice. The yield of rice harvested in this system did not reach the target value in normal paddy fields. To increase this yield, a larger amount of treated wastewater should be applied to the system, considering the significant amount of nitrogen released to the atmosphere.

Wastewater Treatment by a Submerged Contact Media Process Using Net Plates

1991 ◽  
Vol 23 (10-12) ◽  
pp. 1853-1862 ◽  
Author(s):  
T. Nambu ◽  
K. Kawarura ◽  
M. Kaneko
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Recycled Water ◽  
Operational Conditions ◽  
Treatment Performance ◽  
Conventional Activated Sludge ◽  
Treated Municipal Wastewater

Wastewater treatment by using a series of bioreactors with submerged net plates, on which microbial growths could be developed, was studied to evaluate its treatment performance and to find suitable operational conditions for sufficient BOD and nitrogen removal. A comprehensive experimental study was carried out by using a bench-scale plant which treated artificial wastewater and a pilot-scale plant which treated municipal wastewater. This process treated well the wastewater with higher pollutant loads in comparison with the conventional activated sludge process. The wastewater containing 200 mg BOD/l was reduced to 20 mg BOD/l at the high BOD loading of 1,94 kg/m3 day and the retention time less than 5 hours. Nitrogen removal could be explained well by an index defined as the product of the water temperature and the retention time. When the ratio, in flow rate, of recycled water to influent was 4 and the index was more than 400, nitrogen removal more than 80 % was obtained.

Anammox for nitrogen removal from anaerobically pre-treated municipal wastewater: Effect of COD/N ratios on process performance and bacterial community structure

2016 ◽  
Vol 211 ◽  
pp. 257-266 ◽  
Author(s):  
Cíntia Dutra Leal ◽  
Alyne Duarte Pereira ◽  
Fernando Terra Nunes ◽  
Luísa Ornelas Ferreira ◽  
Aline Carolina Cirilo Coelho ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Nitrogen Removal ◽  
Bacterial Community Structure ◽  
Municipal Wastewater ◽  
Process Performance ◽  
Treated Municipal Wastewater

scholarly journals NUTRIENT CHARACTERISTICS OF RICE FOR ANIMAL FEED CULTIVATED WITH CONTINUOUS IRRIGATION OF TREATED MUNICIPAL WASTEWATER

2016 ◽  
Vol 72 (7) ◽  
pp. III_505-III_514
Author(s):  
Toru WATANABE ◽  
Sumiko KURASHIMA ◽  
Dong Duy PHAM ◽  
Kenichi HORIGUCHI ◽  
Atsushi SASAKI ◽  
...  
Keyword(s):  
Municipal Wastewater ◽  
Animal Feed ◽  
Continuous Irrigation ◽  
Treated Municipal Wastewater
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