Removal of ammonia nitrogen in aquaculture wastewater by composite photocatalyst TiO 2 /carbon fibre

2021 ◽  
Author(s):  
Runqiang Yu ◽  
Xiaocai Yu ◽  
Jiayuan Fu ◽  
Yongxia Zhang ◽  
Yifu Liu ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Ammonia Nitrogen ◽  
Composite Photocatalyst ◽  
Aquaculture Wastewater

Study on the Photocatalytic Degradation of Ammonia Nitrogen in Aquaculture Wastewater by Fe3+-Doped Nano-TiO2 under UV Irradiation

2012 ◽  
Vol 476-478 ◽  
pp. 2001-2004
Author(s):  
Xiao Cai Yu ◽  
Peng Fei Zhu ◽  
Kui Sheng Song ◽  
Dong Dong Hu ◽  
Qian Du
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Uv Irradiation ◽  
Volume Fraction ◽  
Ph Value ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Nano Tio2 ◽  
Initial Concentration ◽  
Aquaculture Wastewater

The Fe3+-doped nano-TiO2 catalyst with various amounts of dopant Fe3+ irons was prepared by a sol-gel method. The products were characterized by XRD and SEM. The photocatalytic degradation of ammonia nitrogen in aquaculture wastewater was investigated by using Fe3+-doped nano-TiO2 under UV irradiation. In the experiment, the effect of Fe3+/TiO2 dosage, the ratio of dopant Fe3+, ammonia-N initial concentration, pH value, H2O2 volume concentration, and reaction time, respectively, on the removal of ammonia-N was investigated. The experimental results can be stated as follows: when the ratio of dopant Fe3+ was 0.25% wt, the dosage of Fe3+/TiO2 was 0.7 g/L, the initial concentration of ammonia-N was 10 mg/L, H2O2 volume fraction was 4 %, respectively, if the reaction time may last 4 h, the removal rate of ammonia-N was expected to reach 97.17 %.

Photocatalytic Degradation of Ammonia Nitrogen in Aquaculture Wastewater by Using Nano-TiO2

2011 ◽  
Vol 197-198 ◽  
pp. 774-779
Author(s):  
Peng Fei Zhu ◽  
Xiao Cai Yu ◽  
Qian Du ◽  
Kui Sheng Song ◽  
Zhong Hua He
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Volume Concentration ◽  
Volume Fraction ◽  
Ph Value ◽  
Removal Rate ◽  
Sol Gel ◽  
Ammonia Nitrogen ◽  
Experimental Conditions ◽  
Aquaculture Wastewater

The nano-TiO2photocatalyst was prepared via sol-gel method, and the crystal structure and surface morphology were characterized by XRD and SEM. The photocatalytic degradation of ammonia-N in aquaculture wastewater was investigated by using nano-TiO2under UV irradiation. In the experiment, the effect of nano-TiO2dosage, ammonia-N initial concentration, pH value, H2O2volume concentration, and reaction time, respectively, on the removal of ammonia-N was investigated. On the basis of the results of these experimental data, an orthogonal array experimental design was used to select more efficient degradation condition. The optimal experimental conditions for photocatalytic degradation of ammonia-N can be stated as follows: when the concentration of ammonia-N was 20 mg/L, nano-TiO2catalyst dosage was 1.2 g/L, the pH value of solution was 5, H2O2volume fraction was 4 %, respectively, if the reaction time may last 3 h, the removal rate of ammonia-N was expected to reach 92.10 %.

Study on the Photocatalytic Degradation of Ammonia Nitrogen in Aquaculture Wastewater by Sn4+-Doped Nano-TiO2 under UV Irradiation

2011 ◽  
Vol 347-353 ◽  
pp. 2351-2355 ◽  
Author(s):  
Xiao Cai Yu ◽  
Peng Fei Zhu ◽  
Min Zhang ◽  
Ji Yao Guo ◽  
Xv Zheng
Keyword(s):  
Photocatalytic Degradation ◽  
Calcination Temperature ◽  
Uv Irradiation ◽  
Raw Materials ◽  
Removal Rate ◽  
Sol Gel ◽  
Ammonia Nitrogen ◽  
Tetrabutyl Titanate ◽  
Nano Tio2 ◽  
Aquaculture Wastewater

The Sn4+-doped nano-TiO2 particles with various amounts of dopant Sn4+ irons was prepared by sol-gel method using tetrabutyl titanate(TEOT) as one of the primary raw materials at different calcination temperatures (400-700°C). The products were characterized by XRD and SEM, which revealed that the crystal structure of Sn4+-doped nano-TiO2 changes from anatase to rutile with the calcination temperature increasing, and the nanoparticles diameter was around 10-30 nm. The photocatalytic degradation of ammonia nitrogen in aquaculture wastewater was investigated by using Sn4+-doped nano-TiO2 under UV irradiation. The experimental results can be stated as follows: when the ratio of dopant Sn4+ was 3% wt, the calcination temperature of Sn4+-doped nano-TiO2 was 500 °C, the dosage of Sn4+-doped nano-TiO2 was 0.8 g/L, respectively, if the reaction time may last 4h, the removal rate of ammonia-N was expected to reach 87.13%.

In situ nutrient removal from aquaculture wastewater by aquatic vegetable Ipomoea aquatica on floating beds

2009 ◽  
Vol 59 (10) ◽  
pp. 1937-1943 ◽  
Author(s):  
Wenxiang Li ◽  
Zhongjie Li
Keyword(s):  
Water Quality ◽  
Nutrient Removal ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Ipomoea Aquatica ◽  
Covered Area ◽  
Total Input ◽  
Total Ammonia ◽  
Aquaculture Wastewater ◽  
Artificial Beds

Nutrient-rich effluents caused rising concern due to eutrophication of aquatic environment by utilization of a large amount of formula feed. Nutrient removal and water quality were investigated by planting aquatic vegetable on artificial beds in 36-m2 concrete fishponds. After treatment of 120 days, 30.6% of total nitrogen (TN) and 18.2% of total phosphorus (TP) were removed from the total input nutrients by 6-m2 aquatic vegetable Ipomoea aquatica. The concentrations of TN, TP, chemical oxygen demand (COD) and chlorophyll a in planted ponds were significantly lower than those in non-planted ponds (P<0.05). Transparency of water in planted ponds was much higher than that of control ponds. No significant differences in the concentration of total ammonia nitrogen (TAN), nitrate nitrogen (NO3−-N) and nitrite nitrogen (NO2−-N) were found between planted and non-planted ponds. These results suggested that planting aquatic vegetable with one-sixth covered area of the fishponds could efficiently remove nutrient and improve water quality.

Effect of EM Techniques on Aquaculture Wastewater Purification

2015 ◽  
Vol 1092-1093 ◽  
pp. 838-843
Author(s):  
Long Wang ◽  
Ya Lu Shao ◽  
Li Hua Chen ◽  
Jie Liu ◽  
Xiao Hou Shao ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Wastewater Purification ◽  
Technological Cooperation ◽  
Liquid Preparation ◽  
Active Calcium ◽  
Aquaculture Wastewater ◽  
Better Than

Through real-time monitoring of chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), total nitrogen (TN) and total phosphorus (TP) in the aquaculture wastewater, the purification effects of EM techniques by applying EM active calcium, Microbial nanoSilica Ball and both of them were studied. The results showed that the purification effect of solid preparation for Microbial nanoSilica Ball was better than that of the liquid preparation for EM active calcium. Moreover, the purification effect with the technological cooperation of Microbial nanoSilica Ball with EM active calcium reached best, indicating that the removal rate of COD, NH4+-N, TN and TP in the aquaculture wastewater was 72.12% , 73.85% , 64.99% and 67.87% respectively.

scholarly journals Effect of constructed wetland system on aquaculture wastewater by ecological treatment

2021 ◽  
Vol 269 ◽  
pp. 02002
Author(s):  
Ruohan Tang ◽  
Xiang Chen ◽  
Yuling Ou ◽  
Yeqin Xu ◽  
Zhi Chen
Keyword(s):  
Rural Areas ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Ecological System ◽  
Municipal Wastewater Treatment ◽  
Effluent Concentration ◽  
Poultry Breeding ◽  
Aquaculture Wastewater

In this study, an integrated ecological system was constructed to treat small scattered aquaculture wastewater in southern rural areas of China. The water outlet of 4 level wetlands was continuously monitored from July to December in 2017. Results showed the average concentrations of total nitrogen (TN), ammonia nitrogen (NH4+-N), nitrate nitrogen (NO3-N), total phosphorus (TP) and chemical oxygen demand (COD) were 43.64mg/L, 17.53mg/L, 1.71mg/L, 1.66mg/L and 51.39mg/L in the average effluent concentration of grade I wetland, respectively, and 8.35mg/L, 4.42mg/L, 0.24mg/L, 0.26mg/L, 21.32mg/L in the average effluent concentration of grade IV wetland, respectively. The removal rates were 81%, 75%, 86%, 85% and 59% for TN, NH4+-N, NO3-N, TP and COD in the integrated ecological system, respectively. The effluents from the integrated ecological system met the requirements of “Discharge Standard of Pollutants for Livestock and Poultry Breeding” (GB 18596-2001) and achieved “Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant” (GB 18918-2002) the center two levels to discharge the standard. Obviously, the integrated ecological system could work efficiently in treating the rural scattered aquaculture wastewater, and also possess merits of low construction and operation costs and simple management method, which will be benefited to its application in the southern rural regions of China.

scholarly journals Evaluation of various preparation methods of oil palm fiber (OPF) biochar for ammonia-nitrogen (NH3-N) removal

2021 ◽  
Vol 945 (1) ◽  
pp. 012020
Author(s):  
Tanveer Ahmad ◽  
Sumathi Sethupathi ◽  
Mohammed J K Bashir ◽  
Sin Ying Tan
Keyword(s):  
Oil Palm ◽  
Acid Treatment ◽  
Adsorption Mechanism ◽  
Ammonia Nitrogen ◽  
Preparation Condition ◽  
Preparation Methods ◽  
N Removal ◽  
Aquaculture Wastewater ◽  
Maximum Removal

Abstract The aim of this study is to develop a oil palm based biochar for the selective removal of NH3-N in low concentration from aquaculture wastewater. In this study, three different preparation methods of biochar were evaluated for the adsorption of NH3-N from synthetic aquaculture wastewater. The three methods are pyrolysis, activation with acid before pyrolysis and activation after pyrolysis with numerous oxidizing agents. In the 1st method, various biochars have been prepared at different pyrolysis temperatures (300 – 500 °C) and holding time (0.5 – 2 hr). The maximum removal efficiency of 50 % was achieved at preparation condition of 300 °C and 2 hr. In the 2nd method, the acid activated raw OPF was pyrolyze at 300 °C, 1 hr. The maximum removal was lower compared to the 1st method without acid treatment. In the 3rd Method, the optimized biochar from the 1st method was activated with different activating agents such as, HNO3, HCl, H3PO4, H2SO4, CH3COOH and H2O2 at 100 °C for 2 hr. It was noticed that activation after pyrolysis did not show any improvement in the removal of NH3-N from synthetic aquaculture wastewater. Characterization of optimized samples were carried out to investigate the adsorption mechanism process of NH3-N. The 1st method (pyrolysis) was the best which reported the highest (50 %) removal of NH3-N. Pyrolyzed OPF is a potential adsorbent for NH3-N.

Photocatalytic Degradation of Ammonia Nitrogen in Aquaculture Wastewater by Using Nano-ZnO

2012 ◽  
Vol 610-613 ◽  
pp. 564-568 ◽  
Author(s):  
Kui Sheng Song ◽  
Xiao Cai Yu ◽  
Dong Dong Hu ◽  
Xu Zheng ◽  
Ji Yao Guo
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Volume Fraction ◽  
Ph Value ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Precipitation Method ◽  
Experimental Conditions ◽  
Nano Zno ◽  
Aquaculture Wastewater

Nano-ZnO photocatalyst was prepared using direct precipitation method .The crystal form, particle size and configuration characterization of the nano-ZnO prepared was characterized by XRD and SEM. The photocatalytic degradation of ammonia-N in aquaculture wastewater was investigated by using nano-ZnO under UV irradiation. The experimental results show that: nano-ZnO dosage, catalytic reaction time, initial ammonia-N concentration, H2O2volume concentration, pH value affect the efficiency of photocatalytic degradation significantly. On the basis of the results of these experimental data, the optimal experimental conditions for photocatalytic degradation of ammonia-N are tried through the orthogonal test. The optimization experimental conditions for photocatalytic degradation of ammonia-N in aquaculture wastewater are as follows, nano-ZnO catalyst dosage was 0.4 g/L, the pH value of solution was 10, H2O2volume fraction was 4 %, respectively, if the reaction time may last 1 h, the removal rate of ammonia-N was expected to reach 86.66 %.

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