Removal of Ammonia Nitrogen by Combining the Ammonia Stripping with Electrochemical Oxidation

2013 ◽  
Vol 664 ◽  
pp. 454-457
Author(s):  
Xiu Juan Yu ◽  
Li Hong Ning
Keyword(s):  
Synergistic Effect ◽  
Electrochemical Oxidation ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Electrolysis Time ◽  
Removal Rates ◽  
Ammonia Stripping ◽  
Oxidation Technology ◽  
Simulated Wastewater

The removal of ammonia nitrogen in simulated wastewater with 90mg/L NH4Cl was researched by ammonia stripping, electrochemical oxidation and the combination of the ammonia stripping and electrochemical oxidation. It is shown that the reduction of ammonia is enlarged with increasing of wastewater’s alkalinity during stripping. And the removal rates of ammonia nitrogen are 2.1% at pH2 and 43.1% at pH7 which is not related to the stripping time. The ammonia removal is higher efficiency in pH12 which is in the range of 45.1% and 61.4% when the stripping time is changed from 40 to 100 min. The removal rate of ammonia nitrogen is increased with the extension of electrolysis time by the way of the electrochemical oxidation. For 100min electrolysis, the ammonia removal in the cathodic and anodic compartments are 55.8% and 86.9%, respectively. Moreover, by using the ammonia stripping and electrochemical oxidation simultaneously, the ammonia removal in the cathodic and anodic compartments are up to 91.8% and 99.8% for 100min, respectively. The combining of the ammonia stripping with electrochemical oxidation technology has obviously synergistic effect in purifying ammonia nitrogen wastewater.

Indirect Anodic Oxidation Applied for the Treatment of Simulated Wastewater Containing Reactive Dyes

2012 ◽  
Vol 599 ◽  
pp. 344-347
Author(s):  
Bo Yang ◽  
Dan Du ◽  
Hui Xie ◽  
Ye Sun
Keyword(s):  
Anodic Oxidation ◽  
Ph Value ◽  
Removal Rate ◽  
Reactive Dyes ◽  
Electrolysis Time ◽  
Removal Rates ◽  
Decolorization Rate ◽  
Simulated Wastewater ◽  
Reactive Orange

The treatment of simulated wastewater containing reactive dyes was carried out by indirect anodic oxidation with Ti/IrO2 electrode. The influences of pH value, voltage, electrolysis time and NaCl dosage on the degradation performance were studied. The results show that under the condition (pH=3, voltage=20V, NaCl=2.5g/L), for reactive orange X-GN and yellow X-R, their solutions almost complete bleach after being treated for 30 min, and the removal rates of COD is 68% after being treated for 60 min; for reactive black KN-B, decolorization rate is up to 100% and the removal rate of COD reaches 60% after being treated for 60 min.

High Efficiency Phosphorus Flocculants Prepared with Red Mud for Treating Lake Water

2014 ◽  
Vol 614 ◽  
pp. 649-652
Author(s):  
Wen Qin Zhang ◽  
Bo Lin Li ◽  
Ye Li ◽  
Ya Nan Liang
Keyword(s):  
High Efficiency ◽  
Ammonia Nitrogen ◽  
Acid Modification ◽  
Removal Rates ◽  
Input Quantity ◽  
Optimal Input ◽  
East Lake ◽  
Simulated Wastewater ◽  
Input Amount ◽  
The East Lake

In this study, different acid modification methods were used to prepare two types of inorganic flocculation compounds. First, under simulated wastewater conditions, the optimal input quantity for phosphorus elimination of flocculant #1 was 0.5 g/L, and the optimal agitation conditions were rapid agitation at 300 rpm for 60 s followed by slow agitation at 20 rpm for 15 min. The optimal input amount of flocculant #2 was 0.8 g/L, and the optimal agitation conditions were rapid agitation at 300 rpm for 30 s followed by slow agitation at 100 rpm for 10 min. Then they were used to treat water from the East Lake. The removal rates of TP, ammonia nitrogen, COD, and turbidity by flocculant #1 were 91.45%, 60.90%, 80.71%, and 93.05%, respectively; the corresponding removal rates by flocculant #2 were 92.74%, 58.49%, 76.92%, and 84.66%, respectively. The discharged water for both flocculants had TP and COD concentrations that met the type III standards in GB3838-2002.

The Study on the Treatment of Nitrobenzene Wastewater by Heterogenious Catalysts and Electrode Oxidation

2013 ◽  
Vol 668 ◽  
pp. 140-144
Author(s):  
Su Leng ◽  
Rui Yang Chen ◽  
Song Yue Chen ◽  
Miao Liu
Keyword(s):  
Catalytic Oxidation ◽  
Catalytic Properties ◽  
Ph Value ◽  
Removal Rate ◽  
The Self ◽  
Electrolysis Time ◽  
Oxidation Technology ◽  
Electro Catalytic Oxidation ◽  
La Doped ◽  
Reaction Speed

In the paper, the PbO2-Ti electrodes were characterized by SEM, and introduce the self-made catalyst Fe3+/TiO2 into the electrolytic system to treat the nitrobenzene wastewater, in order to improve the reaction speed and the removal rate of COD and NB and form heterogeneous electro-catalytic oxidation technology. In order to confirm the best removal efficiency of COD and NB, the experiment will study the electrolysis time, current intensity, pH value, and the amount of catalyst. The experimental results showed that the surface of La-doped electrode was dense and had good electro-catalytic properties.

An Experimental Study on Compatible Solute Ectoine Dosing of High Salinity Wastewater

2014 ◽  
Vol 955-959 ◽  
pp. 1907-1910
Author(s):  
Su Chen ◽  
Lei Chao ◽  
Ning Chen ◽  
Lin Shan Wang ◽  
Xue Shao ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Waste Treatment ◽  
High Salinity ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Ammonium Nitrogen ◽  
Treatment Efficiency ◽  
Removal Rates ◽  
Cod Removal Rate ◽  
Salinity Wastewater

When the reactor is added with ectoine of concentrations of 0, 0.1, 1 and 10 mmol/L, the impacts on brine waste treatment efficiency are investigated. The results show that the outflow COD and ammonia nitrogen removal rates are the highest, when the ectoine concentration is 0.1 mmol/L. The brine waste treatment efficiency under addition of ectoine of 1 and 10 mmol/L is even worse than that without ectoine addition. It can be preliminarily determined that the best ectoine dosage is in between 0.1-1.0 mmol/L. When ectoine concentrations added in reactors are 0.2, 0.5, 0.8 and 1.0 mmol/L, the results show that the average reactor outflow COD and ammonia nitrogen removal rates are increased compared with those of reactor without adding ectoine. But when ectoine of 1.0 mmol/L is added, the outflow COD and ammonia nitrogen removal rates decrease. When ectoine dosage is 0.5 mmol/L, the reactor outflow COD and ammonia nitrogen values are the lowest, the removal rates are the highest, the average COD removal rate is 74.46%, and the average ammonium nitrogen removal rate is 54.97%. Compared with reactor without adding ectoine, COD and ammonium nitrogen removal rates are increased by 13.16% and 26.81%. Therefore, the best dosage of ectoine is 0.5 mmol/L.

Reduction Efficacy of Activated Sludge by Electrochemical Oxidation

2012 ◽  
Vol 610-613 ◽  
pp. 2255-2258 ◽  
Author(s):  
Li Wang ◽  
Chun Mei Li ◽  
Xiao Song Li ◽  
Li Jie Wang
Keyword(s):  
Activated Sludge ◽  
Electrochemical Oxidation ◽  
Operation Time ◽  
Cell Lysis ◽  
Clean Technology ◽  
Activated Sludge Process ◽  
Electrolysis Time ◽  
Oxidation Technology ◽  
Sludge Production

As the electrochemical oxidation technology is an effective and reliable clean technology, in this study the electrochemical oxidation activated sludge process was developed, in which the electrolysis reactor with homocentric circle arrangement electrode was installed, with Ti/RuO2 being used as reticular plates. The results showed that the electrochemical oxidation can reduce activated sludge production substantially. The lysis efficiency of activated sludge achieved was 29.98% in the experiment under the optimal oxidation conditions as follows: pH=12, 60 min of intermittent electrolysis time, working voltage of 6 V and initial VSS concentration of 4670 mg·L-1,while the SCOD and TP being released from cell lysis at the maximum of 712.2 and 33 mg·L-1 respectively; and the NH3-N also reached the maximum and presented a declining trend with operation time?, which showed that this conditions were the best for electrolysis oxidation of activated sludge.

scholarly journals Characteristics of Ammonia Removal and Nitrifying Microbial Communities in a Hybrid Biofloc-RAS for Intensive Litopenaeus vannamei Culture: A Pilot-Scale Study

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3000
Author(s):  
Wujie Xu ◽  
Yu Xu ◽  
Haochang Su ◽  
Xiaojuan Hu ◽  
Keng Yang ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Litopenaeus Vannamei ◽  
Removal Rate ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Shrimp Culture ◽  
Recirculating Aquaculture ◽  
Total Ammonia ◽  
High Feed

Ammonia is the main pollution factor of the aquatic environment in marine shrimp culture systems. In order to demonstrate the feasibility of the combination of biofloc technology and nitrifying biofilter for the ammonia removal, a 70-day production trial was conducted in a simplified pilot-scale hybrid biofloc-based recirculating aquaculture system (biofloc-RAS) with the intensive culture of Litopenaeus vannamei. Nitrogen dynamics and nitrifying microbial communities were investigated in three replicated systems simultaneously under the conditions of high feed loading and zero water exchange. Along with biofloc development in the culture tank and biofilm formation in the nitrifying biofilter during the trial, nitrification could be fastly and effectively established in the system, which was indicated by the dynamics of total ammonia nitrogen (TAN), NO2–-N, NO3–-N, and total nitrogen (TN) concentrations. Meanwhile, similar nitrifying microorganisms could be found between biofloc and biofilm, despite some differences in abundance, diversity, and composition of ammonia-oxidizing archaea and bacteria and nitrite-oxidizing bacteria. High TAN removal rate could be achieved and was significantly and positively correlated with abundances of these nitrifying microbial communities in both biofloc and biofilm, further indicating that both biofloc and biofilm could contribute highly to nitrification performance of the biofloc-RAS. The results of this study indicate a potential application of the biofloc-RAS in coastal intensive aquaculture.

scholarly journals Optimization of Ammonia Stripping of Piggery Biogas Slurry by Response Surface Methodology

2019 ◽  
Vol 16 (20) ◽  
pp. 3819 ◽  
Author(s):  
Mengyuan Zou ◽  
Hongmin Dong ◽  
Zhiping Zhu ◽  
Yuanhang Zhan
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Flow Rate ◽  
Gas Flow ◽  
Ph Value ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Biogas Slurry ◽  
Gas Flow Rate ◽  
Ammonia Stripping

Ammonia stripping is a pretreatment method for piggery biogas slurry, and the effectiveness of the method is affected by many factors. Based on the results of single-factor experiments, response surface methodology is adopted to establish a quadratic polynomial mathematical model relating stripping time, pH value and gas flow rate to the average removal rate of ammonia nitrogen to explore the interactions among various influencing factors, obtain optimized combined parameters for ammonia stripping, and carry out experimental verification of the parameters. The results show that when hollow polyhedral packing is adopted under operating conditions including a stripping time of 90 min, pH value of 11, gas flow rate of 28 m3/h, gas–liquid ratio of 2000 and temperature of 30 °C, the average removal rate of ammonia nitrogen in biogas slurry can reach approximately 73%. The experimental value is only 4.2% different from the predicted value, which indicates that analysis on the interaction among factors influencing ammonia stripping of biogas slurry and parameter optimization of the regression model are accurate and effective.

Using the Modified Sugarcane Bagasse Cellulose Cation Membrane as a Separator in the Electrodialysis Device for Ammonia Nitrogen Removal

2019 ◽  
Vol 13 (4) ◽  
pp. 475-483
Author(s):  
Jianhua Xiong ◽  
Shuocheng Guo ◽  
Yanping Hou ◽  
Zhao Dai ◽  
Hongxiang Zhu ◽  
...  
Keyword(s):  
Moisture Content ◽  
Mechanical Strength ◽  
Cation Exchange ◽  
Sugarcane Bagasse ◽  
Removal Rate ◽  
Chemical Properties ◽  
Ammonia Nitrogen ◽  
Electrolysis Time ◽  
Initial Concentration ◽  
Swelling Degree

Bulk modification was applied to synthesize modified sugarcane bagasse cellulose (MSBC) cation exchange membrane using in electrodialysis device for the removal of ammonia nitrogen wastewater. The effect of MSBC mass fraction and pore forming agent in casting solution on membrane physico-chemical properties was studied. XRD showed that the crystal lattice of cellulose in membrane transformed from cellulose I to cellulose II, and the FT-IR displayed that there were no new functional groups after the membrane formation. With the increase of MSBC, the moisture content and swelling degree of the membrane decreased, but the mechanical strength increased and the IEC increased from 0.68 to 1.05 mmol/g. With the increase of pore-forming agent, the moisture content, swelling degree and increased in varying degrees, but the mechanical strength decreased, it is worth noting that ion exchange capacity (IEC) has increased from 0.31 to 1.35 mmol/g as the amount of pore agent is four times that of MSBC. The influence of initial concentration of ammonia nitrogen wastewater, voltage and electrolysis time on the removal rate of ammonia nitrogen was investigated. The results showed that the removal efficiency of ammonia nitrogen was higher when the initial concentration was 1500–2000 mg/L, and the removal rate of ammonia nitrogen can be up to 90.12% under the condition of the voltage is 10 V and the electrolysis time is 7 h. This implied that the cation exchange membranes prepared from MSBC can be produced that can be appliedin wastewater treatment.

Potential for nutrient removal by integrated remediation methods in a eutrophicated artificial lake – a case study in Dishui Lake, Lingang New City, China

2014 ◽  
Vol 70 (12) ◽  
pp. 2031-2039 ◽  
Author(s):  
Qiuzhuo Zhang ◽  
Chi Ding ◽  
Varenyam Achal ◽  
Dan Shan ◽  
Yang Zhou ◽  
...  
Keyword(s):  
Removal Rate ◽  
Buffer Zone ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Water Remediation ◽  
Water Diversion ◽  
Artificial Lake ◽  
Removal Rates ◽  
Remediation Technology ◽  
New City

A new integrated water remediation technology, including a floating bed, a buffer zone of floating plants, enclosed ‘water hyacinth’ purification, economic aquatic plants and near-shore aquatic plant purification, was used in Dishui Lake to improve its water quality. A channel of 1,000 m length and 30 m width was selected to implement pilot-scale experiments both in the static period and the continuous water diversion period. The results showed that the new integrated water remediation technology exhibited the highest removal rate for permanganate index in a static period, which achieved 40.6%. The average removal rates of total nitrogen (TN), ammonia nitrogen (NH3-N) and total phosphorus (TP) in a static period were 23.2, 21.6 and 19.1%, respectively. However, it did not exhibit an excellent removal rate for pollutants in the continuous water diversion period. The average removal rates for all pollutants were below 10%. In winter, the new integrated remediation technology showed efficient effects compared to others. The average removal rate for CODMn, TN, NH3-N and TP were 7, 5.3, 7.6 and 6.5%, respectively. Based on our results, the new integrated water remediation technology was highly efficient as a purification system, especially during the static period in winter.

Pretreatment of High Strength Ammonia Removal from Rare-Earth Wastewater by Magnesium Ammonium Phosphate (MAP) Precipitation

2012 ◽  
Vol 496 ◽  
pp. 42-45 ◽  
Author(s):  
Hao Wang ◽  
Guan Wen Cheng ◽  
Xiao Wei Song ◽  
Zai Han Xu ◽  
Jin Jie Meng ◽  
...  
Keyword(s):  
Rare Earth ◽  
Reaction Time ◽  
Removal Rate ◽  
Ammonium Phosphate ◽  
High Strength ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Molar Ratio ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium

Ammonia is one of the most important contaminants affecting the quality of water environment. Magnesium ammonium phosphate (MgNH4PO4·6H2O), which is a slow releasing fertilizer, is one possible way to remove high strength ammonia from the wastewater. The wastewater is collected from the effluent of extraction of rare earth elements factory, the study investigate the influence of pH, magnesium and phosphate dosing molar ratio and reaction time for ammonia removal rate. The results show that: when the pH = 9.2, n (Mg): n (N): n (P) = 2.2:1:2, reaction time t = 20min, ammonia concentration of the wastewater from 4420mg / L down to 1440mg / L , ammonia nitrogen removal rate can reach 67%, the remaining TP = 0.9mg / L; higher Ca2 + concentration will affect the MAP precipitation for removing ammonia, but it help to reduce total phosphorus concentrations of effluent; it is not the longer reaction time the better removal rate, because the MAP-formation will destroy with longer reaction time.

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