scholarly journals Effect of ElasticFiller on Pollutant Removal in Each Compartment of ABR

2020 ◽  
Vol 12 (6) ◽  
pp. 2325
Author(s):  
Chao Zhang ◽  
Guozhen Zhang ◽  
Fuping Wu ◽  
Tianhong Zhou
Keyword(s):  
Acetic Acid ◽  
Nitrate Nitrogen ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Pollutant Removal ◽  
Soluble Microbial Products ◽  
Nitrite Nitrogen ◽  
Elastic Filler ◽  
Increase Rate ◽  
Microbial Products

This study was aimed to explore the effect of elastic filler on pollutant removal in each compartment of anaerobic baffled reactor (ABR), ABR with elastic filler, and ABR without elastic filler were compared. The result showed that elastic filler increased the removal rate of chemical oxygen demand (COD) and suspended solid (SS) in the first compartment, decreased the removal rate of COD and SS in the second and third compartments, and had little effect on the removal rate of COD and SS in the fourth compartment. Elastic filler increased the increase rate of ammonia nitrogen in the first and second compartments, decreased the increase rate of ammonia nitrogen in the third and fourth compartments; elastic filler had little effect on the nitrate nitrogen, nitrite nitrogen, total nitrogen and total phosphorus in each compartment of ABR. In general, elastic filler could improve the removal rate of COD and SS of ABR but had little effect on the increase rate of ammonia nitrogen, the removal rate of nitrate nitrogen, nitrite nitrogen, total nitrogen and total phosphorus. Elastic filler slightly increased the concentration of formic acid, acetic acid, propionic acid, and butyric acid in the first compartment of ABR, and slightly decreased the sum of formic acid and acetic acid in the second, hird and fourth compartments. Elastic filler did not change the composition of dissolved organic matter (DOM)in each compartment of ABR, but changed the kinds and contents of aromatic proteins, soluble microbial products and humic acids in each compartment of ABR. Elastic filler had little effect on ABR in the removal of aromatic proteins, but they could improve the removal rate of soluble microbial products and humicacids. Elastic filler slightly increased the degree of DOM humification (or maturity) in ABR effluent, but did not change the main source of humus like substance and DOM in ABR effluent.

The Study on Zeolite Column Adsorption of Groundwater Nitrate

2015 ◽  
Vol 1092-1093 ◽  
pp. 1068-1072
Author(s):  
Yi Feng Lei ◽  
Li Na Zheng ◽  
Xin Ran Jiang ◽  
Wei Nan Wu ◽  
Yi Ming Han
Keyword(s):  
Flow Rate ◽  
Nitrate Nitrogen ◽  
Ph Value ◽  
Removal Rate ◽  
Nitrogen Concentration ◽  
Ammonia Nitrogen ◽  
Nitrogen Accumulation ◽  
Late Response ◽  
Nitrite Nitrogen ◽  
Column Adsorption

By zeolite column adsorption test process of nitrate pollution of groundwater, the research of three different inlet velocity of nitrate nitrogen removal, and the roles of nitrite nitrogen accumulation, zeolite adsorption of ammonia nitrogen and the influence of pH value changes, the results show that when the flow rate of 70 mL/h, the nitrate nitrogen concentration in the reaction column rising velocity under concentration less than before, but nitrate nitrogen concentration in the zeolite column has remained at about 3 mg/L, removal rate has remained at more than 95%; Nitrite nitrogen accumulation showed a trend of gradual decline, within the scope of flow rate of 90 mL/h, not affected by the late response, nitrite nitrogen concentration of 0.2 mg/L; As the reaction progresses, pH value gradually rose slightly, but still within the range of 6.0 to 8.0; Flow rate of 50 mL/h, zeolite adsorption of ammonia nitrogen effect is best.

Study on Eliminating Three Nitrogen of Recycling Aquaculture Using the New-Style Incorporated Aquarium

2011 ◽  
Vol 138-139 ◽  
pp. 1050-1055 ◽  
Author(s):  
Li Li Dong ◽  
Ji Guo Huang ◽  
Meng Sun
Keyword(s):  
Water Temperature ◽  
Nitrate Nitrogen ◽  
Removal Rate ◽  
Air Flow ◽  
Ammonia Nitrogen ◽  
Living Environment ◽  
Adsorption Complex ◽  
Activated Carbon Adsorption ◽  
Nitrite Nitrogen ◽  
Water Recycle

Aimed at the current problems of capacious of hydrotreater, susceptible to plugging by microbe and the accumulation of ammonia or nitrite nitrogen in aquaculture, the aquarium (contain with the water treatment processor) using physical filtration + biodegradation + activated carbon adsorption complex process was devised to treat aquaculture for recycle. Under different working conditions, the effects of water temperature, hydraulic retention time (HRT), air flow and aeration mode on removal efficiency of ammonia, nitrite nitrogen and nitrate nitrogen (three nitrogen) in aquaculture. The test results showed that sludge yielding in the hydrotreater was low and hydrotreater was insusceptible to be plug. In addition, under the conditions of water temperature 25°C, air flow 1.5L/min,HRT 1.5h and intermittent aeration (aerating once every 1h), the removal rate of ammonia nitrogen , nitrate nitrogen and nitrite nitrogen was over 97.5% ,96% and 98.7% respectively, it means the three nitrogen was not detected. Therefore, the incorporated aquarium could permanently preserved favorable living environment for fish and could provide technological security for three nitrogen remove of fish farm water and for intensifying water recycle.

Experimental effect of medium ratio on removal efficiency of nitrate nitrogen in groundwater by zero-valent iron, activated carbon and zeolite

2019 ◽  
Vol 19 (6) ◽  
pp. 1636-1642
Author(s):  
Sizhi Cao ◽  
Peigui Liu ◽  
Mingchao Liu ◽  
Gang Wang ◽  
Zaili Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Nitrate Removal ◽  
Ammonia Nitrogen ◽  
Coarse Sand ◽  
Zero Valent Iron ◽  
Nitrite Nitrogen ◽  
Rich Solution ◽  
Set Up

Abstract In this study, column experiments in the laboratory were set up to examine how the concentrations of nitrate nitrogen, nitrite nitrogen, and ammonia nitrogen changed when a nitrate-rich solution was passed through a medium comprising zero-valent iron, activated carbon, zeolite, and coarse sand. We varied the proportions of the components of the medium to determine how it influenced the nitrate removal and nitrogen fractions. Three different scenarios were used, with: (1) iron, activated carbon, and coarse sand at a ratio of 3:1:6; (2) iron, activated carbon, and zeolite at a ratio of 3:1:6; and (3) iron, activated carbon, and zeolite at a ratio of 3:3:4. The nitrate nitrogen concentration decreased from 25 mg/L to 2 mg/L in the first scenario. Removal was better when zeolite was added to the medium as most of the nitrate nitrogen broke down to ammonia nitrogen, with nitrite nitrogen as an intermediate product. The results of the tests showed that nitrate removal was best when the medium was iron, activated carbon, and zeolite, mixed at a ratio of 3:1:6. This study provides a scientific reference for in situ remediation of nitrate pollution in groundwater.

Effect of continuously dosing Cu(II) on pollutant removal and soluble microbial products in a sequencing batch reactor

2015 ◽  
Vol 72 (9) ◽  
pp. 1653-1661 ◽  
Author(s):  
YangWei Yan ◽  
YuWen Wang ◽  
Yan Liu ◽  
Xiang Liu ◽  
ChenChao Yao ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Extracellular Polymeric Substances ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Pollutant Removal ◽  
Cod Removal ◽  
Synthetic Wastewater ◽  
Soluble Microbial Products ◽  
Cod Removal Efficiency ◽  
Microbial Products

The effects of synthetic wastewater that contained 20 mg/L Cu(II) on the removal of organic pollutants in a sequencing batch reactor were investigated. Results of continuous 20 mg/L Cu(II) exposure for 120 days demonstrated that the chemical oxygen demand (COD) removal efficiency decreased to 42% initially, followed by a subsequent gradual recovery, which peaked at 78% by day 97. Effluent volatile fatty acid (VFA) concentration contributed 67 to 89% of the influent COD in the experimental reactor, which indicated that the degradation of the organic substances ceased at the VFA production step. Meanwhile, the varieties of soluble microbial products (SMP) content and main components (protein, polysaccharide, and DNA) were discussed to reveal the response of activated sludge to the toxicity of 20 mg/L Cu(II). The determination of Cu(II) concentrations in extracellular polymeric substances (EPS) and SMP throughout the experiment indicated an inverse relationship between extracellular Cu(II) concentration and COD removal efficiency.

Study on the Effect of Flow Velocity on the Denitrification of Groundwater

2015 ◽  
Vol 1092-1093 ◽  
pp. 933-937
Author(s):  
Xin Ran Jiang ◽  
Li Na Zheng ◽  
Xing Ai ◽  
Lin Zhang ◽  
Wei Nan Wu
Keyword(s):  
Flow Rate ◽  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Ammonia Nitrogen ◽  
Nitrogen Accumulation ◽  
Inlet Velocity ◽  
Nitrite Nitrogen ◽  
Accumulation System ◽  
Inlet Flow Rate ◽  
Reaction Column

Using the mixed filling reaction column, this article examines that the influence of different inlet flow rate on the removal of nitrate nitrogen in groundwater, respectively by 90mL/h, 150 mL/h, 210mL/h velocity, under 30 °C each run five days, comparativly studies the influence of velocity on denitrification. The results show that the flow rate has an important effect on the denitrification of water, when the water inlet velocity decreased from 150mL/h to 90mL/h, the concentration of nitrate nitrogen reaction column effluent decreased gradually, and the denitrification of nitrite nitrogen accumulation system has been in a low level, but the ammonia nitrogen accumulation only in the flow rate of 90mL/h, began when the flow rate decreased significantly; also increased from 90mL/h to 210mL/h, the effluent nitrate nitrogen concentration, nitrite nitrogen concentration and ammonia nitrogen concentration increased significantly.

Startup of Seawater Anaerobic Ammonia Oxidation Reactor

2014 ◽  
Vol 884-885 ◽  
pp. 582-585
Author(s):  
Jing Wang ◽  
Jian An Hao ◽  
Ai Jun Zhang ◽  
Bo Yang ◽  
Tian Xiang Jiang ◽  
...  
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Ammonia Oxidation ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Second Stage ◽  
Nitrite Nitrogen ◽  
Anaerobic Ammonia Oxidation ◽  
Oxidation Reactor ◽  
Two Stages

Muds and water samples collected from the Bohai Sea were selected to build seawater anaerobic ammonia oxidation reactor. The reaction volume was 18 L. The startup of reactor was divided into two stages. The first stage lasted five months and hydraulic retention time was 18L/7 d. The second stage lasted a month and hydraulic retention time was 18L/14 d. Ammonia and nitrite of influent and effluent were monitored. During the first stage, the removal rate of ammonia nitrogen was around 50% and the nitrite nitrogen increased by 50%. During the second stage, the removal rate of ammonia nitrogen reached more than 75% and the removal rate of nitrite nitrogen reached more than 90%. The removal ratio of ammonia nitrogen and nitrate nitrogen was about 1:1.17. These results suggested reactor start-up successful. Microbial community in reactor was monitored by polymerase chain reaction. Once the reactor started, specific bands of anaerobic ammonia oxidation microorganisms were found.

Denitrification of groundwater using acetic acid as a carbon source

1999 ◽  
Vol 40 (2) ◽  
pp. 53-59 ◽  
Author(s):  
A. Mohseni-Bandpi ◽  
D. J. Elliott ◽  
A. Momeny-Mazdeh
Keyword(s):  
Acetic Acid ◽  
Carbon Source ◽  
Nitrate Nitrogen ◽  
Removal Rate ◽  
Bacterial Species ◽  
Nitrate Removal ◽  
Pilot Scale ◽  
Operating Conditions ◽  
Acid Loading ◽  
Species Being

A pilot scale rotating biological contactor was used to investigate the ability to remove nitrate from groundwater using acetic acid as a carbon source under various operating conditions. The reactor achieved a nitrate removal efficiency of 99 to 83 percent at loading rates of 76 and 490 mg/m2.hr respectively with a flow rate of 2.5 l/min at 20±2°C. The nitrate removal rate was found to be dependent on the influent acetic acid loading rate. The optimum acetic acid to nitrate-nitrogen (A/N) ratio was found to be 4.3:1. Under optimum conditions the effluent nitrate, nitrite-nitrogen and residual acetic acid concentrations were 0.43, 0.03 and 4.4 mg/l. The process generally produced low nitrite intermediate production for up to 100 mg/l influent nitrate-nitrogen. The results of this study show that an anoxic RBC using acetic acid as a carbon source is a convenient and reliable process for the removal of nitrate from water supply. Pseudomonas were found to be the dominant bacterial species with species being Ps. stutzeri and Ps. fluorescence.

In-situ remediation of nitrate-contaminated ground water by electrokinetics/iron wall processes

1998 ◽  
Vol 38 (7) ◽  
pp. 135-142 ◽  
Author(s):  
Chin F. Chew ◽  
Tian C. Zhang
Keyword(s):  
Contaminated Soils ◽  
Nitrate Nitrogen ◽  
Transformation Products ◽  
Ammonia Nitrogen ◽  
System A ◽  
Nitrite Nitrogen ◽  
Major Transformation ◽  
Ph Conditions ◽  
Experimental Runs

The feasibility of using electrokinetics coupled with a zero valent iron (Fe0) treatment wall to abiotically remediate nitrate-contaminated soils was investigated. Upon completion of each test run, the contaminated soil specimen was sliced into five parts and analyzed for nitrate-nitrogen, ammonia-nitrogen and nitrite-nitrogen. Nitrogen mass balance was used to determine the major transformation products. In control experiments where only electrokinetics was used at various constant voltages, 25 to 37% of the nitrate-nitrogen was transformed. The amount of nitrate-nitrogen transformed improved when a Fe0 wall (20 g or about 8-10% by weight) was placed near the anode. For test runs at various constant voltages, the amount of nitrate-nitrogen transformed ranged from 54 to 87%. By switching to constant currents, the amount of nitrate-nitrogen - transformed was about 84 to 88%. The major transformation products were ammonia-nitrogen and nitrogen gases. Nitrite-nitrogen was less than 1% in all experimental runs. Two localized pH conditions exist in the system, a low pH region near the anode and a high pH region near the cathode. Placing of an iron wall near the anode increases the pH in that area as time increases. Movement of the acid front did not flush across the cathode. This research has demonstrated that the electrokinetics/iron wall process can be used to remediate nitrate-contaminated groundwater.

scholarly journals Spatiotemporal distribution of nitrogen and phosphorus in alpine lakes in the Sanjiangyuan Region of the Tibetan Plateau

2017 ◽  
Vol 76 (2) ◽  
pp. 396-412 ◽  
Author(s):  
Su-jin Lu ◽  
Jian-huan Si ◽  
Chuan-ying Hou ◽  
Yu-si Li ◽  
Meng-meng Wang ◽  
...  
Keyword(s):  
Total Nitrogen ◽  
Total Phosphorus ◽  
Nitrate Nitrogen ◽  
Quality Standards ◽  
Alpine Lakes ◽  
Ammonia Nitrogen ◽  
Sea Star ◽  
Water Quality Standards ◽  
Nitrogen And Phosphorus ◽  
Nitrite Nitrogen

To provide a theoretical basis for alpine source lake protection, ten samples were taken from each lake annually from 2012 to 2015. Each year, the various species of nitrogen and phosphorus nutrients were measured. The average contents of nitrate nitrogen, ammonia nitrogen, nitrite nitrogen, total phosphorus, and total nitrogen in the four lakes are 0.195–0.0 mg/L, 0.038–0.143 mg/L, 0.004–0.168 mg/L, 0.006–0.740 mg/L, and 0.050–0.547 mg/L, respectively. The total phosphorus contents in Eling Lake, Longbao Lake and Sea Star were higher than Class I water quality standards, and the total nitrogen contents in Eling Lake, Sea Star and Zhaling Lake were higher than Class I water quality standards as well. The concentration contour maps of the nitrate nitrogen, ammonia nitrogen, nitrite nitrogen, total phosphorus and total nitrogen showed that the indicators of the four lakes in the east, the west, and the center of the lake did not have the same trend. From 2012 to 2015, each of the measured nutrients showed a rising trend year by year. The four lakes are polluted by both endogenous and exogenous pollution, and it is necessary to limit the exogenous pollution and protect the alpine lakes immediately.

The Uptake Kinetics of Nitrogen and Phosphorus by Nitzschia Sp.

2012 ◽  
Vol 518-523 ◽  
pp. 549-553 ◽  
Author(s):  
Qun Su ◽  
Rong Lian Xing ◽  
Hui Yi Wang
Keyword(s):  
Nitrate Nitrogen ◽  
Ammonia Nitrogen ◽  
Good Effect ◽  
Kinetic Characteristics ◽  
Nitrogen And Phosphorus ◽  
Nitrite Nitrogen ◽  
Uptake Rates ◽  
Absorption Kinetic ◽  
Phosphate Nitrate ◽  
Kinetics Of

The effects of eutrophication on the absorption kinetic parameters of nitrogen and phosphorus are investigated. The results show that the kinetic characteristics of phosphate, nitrate- nitrogen, ammonia-nitrogen and nitrite-nitrogen of Nitzschia sp. are all generally in accord with the function of Michaelis-Menten equation. The Km of them are 1.81 mg/L, 1.75 mg/L, 0.20 mg/L and 4.53 mg/L, respectively. The maximum uptake rates of nitrate-nitrogen and ammonia- nitrogen are higher than that of nitrite-nitrogen, which indicates that nitrate-nitrogen and ammonia- nitrogen can be uptaken more preferential than that of nitrite-nitrogen. In conclusion, Nitzschia sp. has a fast utilized rate of ammonia-nitrogen, nitrate-nitrogen and phosphorus. This indicates that Nitzschia sp. has a good effect on water quality and it could be applied potentially to purify waste water.

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