nitrate ions Articles
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Rapid Field Test for Nitrate and Ammonia in Reclaimed Water
Untitled Document Estimating the concentrations of nitrate and ammonium ions in groundwater from reclaimed water is extremely important. These determinations are usually performed in laboratories using sophisticated equipment, and turn-around time can be from 2 hours to 3 days. Many times, results are needed at the site as quickly as possible. Alternatively, the rapid ...
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Comparison of adsorption models for the removal of fluorides, nitrates and sulfates by adsorption onto AFN membrane
The main purpose of this work was to determine adsorption characteristics of fluoride, nitrate and sulfate ions on the AFN membrane. The sorption isotherms for , and ions on the AFN membrane were investigated in the range of 0.05–1 mol.L–1 at 298 K. The suitability of the Langmuir, Dubinin–Astakhov (D-A) and Redlich–Peterson adsorption models to the equilibrium data was investigated. The ...
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Photochemical Transformation of Bisphenol A Promoted by Nitrate Ions
Bisphenol A [2, 2-bis (4-dihydroxydiphenyl) propane] (BPA is widely used as a raw material for polycarbonate and epoxy resins. The residue level of BPA in surface water was shown to be at a rather high level, ranging from 4.4x10-10 to 5.3x10-8 mol L-1 by the U.S. Geologial Survey (Kolpin et al. 2002) and 5.7x10-9 to 5.7x10-5 mol L -1 in landfill leachates in Japan (Yamamoto et al. ...
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Photodegradation of nitroaromatic compounds in aqueous solutions in the UV/H2O2 process
Photodegradation of nitrobenzene and nitrophenols in aqueous solutions by means of UV/H2O2 process was studied in the Rayox batch reactors. Three nitrophenol isomers were identified as main photoproducts in the irradiated NB aqueous solutions. The distribution of nitrophenol isomers follows the order p-> m-> o-nitrophenol. Other intermediates detected include nitrohydroquinone, ...
By IOS Press
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Ammonia, Nitrite and Nitrate Nitrogen Removal From Polluted Source Water With Ozonation and BAC Processes
Studies on the removal of ammonia-, nitrite-, and nitrate nitrogen with ozonation (p3), sand filtration (SF), biological activated carbon (BAC), SF-BAC, and/or O3-BAC processes were carried out in two pilot plants and a full scale plant, respectively. The results showed that all of the tested processes exhibited certain nitrogen removal efficiencies, of which both the O3-SF-BAC and O3-BAC ...
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Efficacy of vacuum ultraviolet photolysis for bromate and chlorate removal
We introduce vacuum ultraviolet (VUV) photolysis at 172 nm as a more efficient process for bromate and chlorate removal than conventional ultraviolet (UV) photolysis at 254 nm. We discuss the effects of pH and coexisting salts on VUV photolysis. In experiments at various pH levels, the VUV photolysis performance decreased in the alkaline region for pH above 7. Furthermore, nitrate and inorganic ...
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Study on washwater effluent quality discharged by ship exhaust gas DeSO
xsystem with magnesium and seawater desulphurisation methodThe latest convention of ship pollution prevention was carried out by the International Maritime Organization (IMO), which requires that sulphur dioxide emissions from ships around the world must be further reduced. A novel wet scrubber system with MgO and seawater (M&S) as desulphuriser was proposed to deal with the new convention. The quality of the washwater effluent discharged by M&S DeSOx ...
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Degradation of tetracycline in water by ultrasonic irradiation
The objective of this work is to investigate the effectiveness of ultrasonic radiation for the degradation of tetracycline. We analyzed the influence of several operational parameters, including the solution pH, ultrasonic power, initial concentration of tetracycline, H2O2 addition, and the most common anions in surface waters such as bicarbonate, nitrate and sulfate. The results showed that ...
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Electrochemical oxidation of landfill leachates at pilot scale: evaluation of energy needs
Two of the main drawbacks to be overcome before full scale implementation of boron-doped diamond electro-oxidation were addressed in this work; its energy consumption and hazard of formation of chlorinated organics. This was framed within a study in which the technical and economic feasibility of BDD electro-oxidation of landfill leachate was evaluated at pilot scale. On one hand, its technical ...
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Simultaneous use of iron and copper anodes in photoelectro-Fenton process: concurrent removals of dye and cadmium
Photoelectro-Fenton (PEF) was carried out for concurrent removals of inorganic and organic pollutants with simultaneous applications of two different anodes (iron and copper). Cadmium and Direct Orange 26 (DO26) were selected as samples of the contaminants of textile wastewater and influential parameters (pH, current density, H2O2 dosage and electrolysis time) of PEF were evaluated on Cd and ...
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Decolorization of azo dye C.I. Reactive Black 5 by ozonation in aqueous solution: influencing factors, degradation products, reaction pathway and toxicity assessment
In this study, ozonation treatment of C.I. Reactive Black 5 (RB5) was investigated at various operating parameters. The results showed that the aqueous solution initially containing 200 mg/L RB5 was quickly decolorized at pH 8.0 with an ozone dose of 3.2 g/h. Reaction intermediates with m/z 281, 546, 201, 350, 286 and 222 were elucidated using liquid chromatography-mass spectrometry, while ...
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Biological nitrate removal from water resources
During the recent decades, the increasing trends in nitrate ion concentration in ground water sources have meant more research to find effective procedures for the prevention of even more water contamination by nitrogen sources. In this study a pilot was designed to examine the application of biological method for eliminating nitrate from the water of well No.903 of Mehrabad Airport, Tehran, ...
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Nitrate Removal With Ion Exchange - Case Study
Location: Nevada. Flow, gpm: 140. Contaminant: NO3. Solution: NO3 removal to below MCL. ...
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Optimal synthesis and nitrate and mercury removal ability of microemulsion-made iron nanoparticles
Controlled preparation of iron nanoparticles through reduction of Fe3+ ions is investigated, using potassium borohydride solution in a microemulsion system. The effect of three low-cost cationic, anionic and non-ionic surfactants at various concentrations on the size of prepared iron nanoparticles is studied. Results show that the anionic surfactant, sodium dodecyl sulfate (SDS), significantly ...
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Indoor-outdoor relationship of suspended particulate matter and its chemical composition at different sizes
The indoor-outdoor concentration relationship of particulate matter PM9.0 (aerodynamic diameter 9 µm or smaller) and its chemical composition (sulfate, nitrate, chloride and ammonium) has been studied. Samples were collected using four identical Anderson impactors, each one collecting nine size ranges by eight impactor stages (9, 5.8, 4.7, 3.3, 2.1, 1.1, 0.65 and 0.43 µm) plus a back-up filter ...
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Impact on Gaza aquifer from recharge with partially treated wastewater
The Gaza Strip suffers from high pressure imposed on its water resources. There is a deficit of about 50 mm3 every year, which has led to a declination of groundwater level and deterioration of groundwater quality. New water resources are sought to fulfil the water deficit; among them is the artificial recharge of treated wastewater to groundwater. The impact of recharging partially treated ...
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Ammonia sensor and nitrate sensor with improved selectivity over critical interfering ions for municipal wastewater Treatment Plants - Case Study
Capability to measure below 1ppm ammonium (total ammonia or NH3-N) in presence of common levels of potassium for secondary WWTP Capability to measure nitrate (NO3-N) even in the presence of high levels of chloride or nitrite ions without loss of linearity or stability Ammonia and nitrate measurements can be performed using just one analyzer Support for dual ammonia/ammonia, nitrate/nitrate ...
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Preliminary studies on removal of nitrate and hardness from ground water using polystyrene beads
Ground water has emerged as the primary water deficiency reduction tool in most developing countries. Recently, the quality of ground water has deteriorated due to over-exploitation and contamination resulting from anthropogenic activities. A broad range of physical, inorganic and organic, bacteriological, and radioactive parameters are found in ground waters. The presence of nitrate and ...
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Free ammonia NH3-N (Total Nitrogen) measurement in municipal water districts - Case Study
Real-time continuous online measurement system for ammonia Low Initial Procurement Cost compared to competing technologies and offerings No need for chemical feed and rebuilding of sensors Lower Cost of Ownership due to very long sensor lifetime, low maintenance & cleaning requirements for inline, immersion & submersion ion selective sensors Intuitive and easy to use Rosemount 1056 ...
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Pollution of surface runoff from the territory of Brest, Belarus
The assessment of the influence of urban surface runoff on the quality of river water in the city of Brest was made. Surface runoff was studied in two phases (winter and summer) for the following parameters: pH, total suspended solids (TSS), concentration of chloride, nitrate, phosphate and ammonium ions, total oils. The results show that urban surface runoff is an important source of pollution ...
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