nitrate removal Articles

  • Nitrate Removal by Countercurrent Ion Exchange

    Nitrate removal technology by continuous countercurrent ion exchange from potable water. High flow capacity, low waste generation. This ICHEM award winning technology is the industry standard used in the United Kingdom. More than 20 installations installed. PuriTech's patented multi-port valve is at the center of each production skid. At average, each unit produces a maximum waste ...


    By PuriTech Ltd

  • Ionex- Versatile ion exchange technology for Nitrate removal

    Belgian separations technology company PuriTech (www.puritech.be) has designed an ion exchange system that improves liquid–resin contact efficiency while reducing plant operating costs and capital expenditure. Targeted at a broad range of industries, one area where the system is now showing its strength is in the removal of nitrates from drinking water, asPuriTech's Filip ...


    By PuriTech Ltd

  • Nitrate removal from water by immobilized bacteria

    Nitrate may reach surface and ground waters as a consequence of agricultural activity and discharge of domestic and industrial waste. Among the various methods used for nitrate removal, denitrification, a process in which nitrate is biologically reduced to elemental nitrogen, is relatively reliable and inexpensive as compared to other physical and chemical nitrate removal processes. ...


    By IWA Publishing

  • 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, ...

  • Why are we monitoring nutrients at different depths?

    Recently, LG Sonic introduced the MPC-Lab, an innovative monitoring buoy that can monitor algae, physico-chemical variables, and even nutrients such as nitrogen and phosphorus in near real-time and at different depths in a body of water. Combined with our other monitoring tools, this system offers a unique way to detect the spatial and temporal patterns of nutrient concentrations which play a ...


    By LG Sonic

  • Nitrate removal by nitrate-dependent Fe(II) oxidation in an upflow denitrifying biofilm reactor

    A continuous upflow biofilm reactor packed with ceramsite was constructed for nitrate removal under an anaerobic atmosphere without an organic carbon source. Denitrifying bacteria, Pseudomonas sp. W1, Pseudomonas sp. W2 and Microbacterium sp. W5, were added to the bioreactor as inocula. Nitrate concentration, nitrite accumulation and nitrogen removal ...


    By IWA Publishing

  • An Innovative Approach to Nitrate Removal: Making a Dent in the Gulf of Mexico Hypoxia

    ABSTRACTThis paper explores the feasibility of using existing biological nutrient removal technology to achieve a 30 percent reduction in nitrate loading from the Lower Illinois River Basin (LIRB), which is a highly agricultural watershed that drains to the Mississippi River. This level of nitrate reduction is in line with the overall goal of the Gulf of Mexico Hypoxia Action Plan. Agriculture ...

  • Nitrate removal from natural water by coupling adsorption and Donnan dialysis

    A hybrid adsorption/Donnan dialysis (DD) process for nitrate removal using PUROLITE A520E resin as an adsorbent was investigated in this work. PUROLITE resin was introduced into the DD process due to its good selectivity adsorption for nitrate and widespread availability. This study was conducted in order to benefit from each process, and it was an original and new combination. The retention ...


    By IWA Publishing

  • Biological nitrate removal using waste-derived extracts as sole carbon source

    Waste-derived multicomponent extracts were investigated as carbon source for biological nitrate removal. Aerobic and anaerobic sludge from a municipal wastewater treatment plant and leachate from an anaerobic digester treating food waste were studied. Alkaline-heat treatment was used for sludge solubilisation. More than 90% carbon was recovered at pH 10–11. The extracts contain very high ...


    By Inderscience Publishers

  • Bioregeneration of Spent Ion-Exchange Resin Loaded with Nitrate/Perchlorate and Biofouling Removal

    A new process has been developed that regenerates perchlorate/nitrate-contaminated ionexchange resins (IX) biologically without requiring the use of brine. The process consists of directly contacting perchlorate/nitrate-loaded IX resin with a perchlorate/nitrate-reducing microbial culture under anoxic/anaerobic conditions leading to conversion of the perchlorate and nitrate load on the resin to ...

  • Nitrate removal using different carbon substrates in a laboratory model

    Agricultural fields have been frequently identified as major contributors of nitrate leaching into surface and ground waters. Tile drains can act as direct pathways, transferring leached nitrate to surface water. Bioreactor filters are useful for the removal of nitrate from drainage waters; however, these filters require an external carbon supply to sustain denitrification. In this study, four ...


    By IWA Publishing

  • 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 ...


    By Inderscience Publishers

  • Assessing performance of on-line nitrate analyzers

    Traditionally, activated sludge processes were designed to remove organics and suspended solids from wastewater. The justification for including nitrogen control in wastewater treatment facilities began with the need to protect receiving waters from the increasing problem of eutrophication and hypoxia (low levels of dissolved oxygen in bottom waters, generally less than 2 mg/l). One of the ...

  • In-stream bioreactor for agricultural nitrate treatment

    Nitrate from agricultural activity contributes to nutrient loading in surface water bodies such as the Mississippi River. This study demonstrates a novel in-stream bioreactor that uses carbonaceous solids (woodchips) to promote denitrification of agricultural drainage. The reactor (40 m3) was trenched into the bottom of an existing agricultural drainage ditch in southern Ontario (Avon site), and ...

  • Effect of NaCl on nitrate removal from ion-exchange spent brine in the membrane biofilm reactor (MBfR)

    The H2-based membrane biofilm reactor was used to remove nitrate from synthetic ion-exchange brine at NaCl concentrations from ∼3 to 30 g/L. NaCl concentrations below 20 g/L did not affect the nitrate removal flux as long as potassium was available to generate osmotic tolerance for high sodium, the H2 pressure was adequate, and membrane fouling was eliminated. Operating pHs of 7–8 and periodic ...


    By IWA Publishing

  • Application of light-weight filtration media in an anoxic biofilter for nitrate removal from micro-polluted surface water

    The research investigated nitrate removal from micro-polluted surface water by the single-stage process of anoxic biofilter using light-weight polystyrene beads as filtration media. In this study, sodium acetate was used as an external carbon source and the nitrate removal efficiency under different regimes of hydraulic loading rate (HLR), water temperature, and C/N ratio was studied. In ...


    By IWA Publishing

  • Sulfide removal from industrial wastewaters by lithotrophic denitrification using nitrate as an electron acceptor

    Sulfide is present in wastewaters as well as in biogas and can be removed by several physicochemical and biotechnological processes. Nitrate is a potential electron acceptor, readily available in most wastewater treatment plants and it can replace oxygen under anoxic conditions. A lab-scale reactor was operated for treatment of sulfide containing wastewater with nitrate as an electron acceptor ...


    By IWA Publishing

  • Study of novel mechano-chemical activation process of red mud to optimize nitrate removal from water

    Red mud (RM) is the industrial waste of alumina production and causes serious environmental risks. In this paper, a novel activation procedure for RM (mechano-chemical processing) is proposed in order to improve the nitrate adsorption from water. High-energy milling and acidification were selected as mechanical and chemical activation methods, respectively. Synthesized samples of adsorbent ...


    By IWA Publishing

  • 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 ...


    By IWA Publishing

  • 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 ...


    By Absolute Systems Inc.

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