denitrification Articles
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Nitrogen removal from livestock and poultry breeding wastewaters using a novel sequencing batch biofilm reactor
A study was conducted regarding the biological nitrogen removal from the livestock and poultry breeding wastewater (LPBWs) using a novel sequencing batch biofilm reactor (SBBR). Nitrogen removal process was studied under three aeration strategies/modes, referred to as MODE 1, 2, and 3. The results showed that MODE 2 (one operation period: instant fill of LPBWs, 3.0 h aeration, 1.5 h non-aeration, ...
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Treatment of farm dairy effluent with hybrid upflow multilayer bioreactor and activated sludge module
Biological removal of nitrogen and carbon from farm dairy effluent (FDE) was studied with two laboratory-scale systems following nitrification and denitrification processes. Each system consisted of an upflow multilayer bioreactor (UMBR) as a pre-denitrification unit, an aeration tank (AT) as nitrification unit and a secondary clarifier. The optimization of two operational variables, total ...
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A new reactor for denitrification and micro-particle removal in recirculated aquaculture systems
A ‘membrane-denitrification’ reactor (MDR) was developed and tested in a semi-technical recirculation aquaculture system in comparison to a double – without MDR – as reference system. The MDR consisted of a reactor with an ultrafiltration membrane unit for removal of micro-particles (e.g. sludge flocs, bacteria and parasites). Specific carrier material provided surfaces for biofilm growth in ...
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Nitrogen mass balance of a tile-drained agricultural watershed in East-Central Illinois
Received for publication September 10, 2008. Simple nitrogen (N) input/output balance calculations in agricultural systems are used to evaluate performance of nutrient management; however, they generally rely on extensive assumptions that do not consider leaching, denitrification, or annual depletion of soil N. We constructed a relatively complete N mass balance for the Big Ditch watershed, an ...
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Nitrogen mass balance of a tile-drained agricultural watershed in East-Central Illinois
Simple nitrogen (N) input/output balance calculations in agricultural systems are used to evaluate performance of nutrient management; however, they generally rely on extensive assumptions that do not consider leaching, denitrification, or annual depletion of soil N. We constructed a relatively complete N mass balance for the Big Ditch watershed, an extensively tile-drained agricultural watershed ...
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Nitrous oxide production in an eastern corn belt soil: sources and redox range
Nitrous oxide derived from soils is a main contributor to the greenhouse gas effect and a precursor to ozone-depleting substrates; however, the source processes and interacting controls are not well established. This study was conducted to estimate the magnitude and source (nitrification vs. denitrification) of N2O production as affected by the form of N fertilizer, soil water content, and redox ...
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Effects of the herbicide topogard on soil respiration, and denitrification in potato-cultivated soils differing in pH
We investigated the effects of Topogard 50 WP (3 kg ha–1) on soil respiration, mineral N content, and number of denitrifying and total bacteria in four coarse-textured volcanic soils for 91 days. Topogard application decreased CO2 evolution in acid soils (Tepedibi and Karaçakl) whereas soil respiration was initially increased in neutral and alkaline soils (Kaba and Balar). The herbicide ...
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Procedure for rapid determination of δ15N and δ18O values of nitrate: development and application to an irrigated rice paddy watershed
The dual isotope approach using the stable isotope ratios of nitrate nitrogen (δ15NNO3) and oxygen (δ18ONO3) is a strong tool for identifying the history of nitrate in various environments. Basically, a rapid procedure for determining δ15NNO3 and δ18ONO3 values is required to analyze many more samples quickly and thus save on the operational costs of isotope-ratio mass spectrometry (IRMS). We ...
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Effects of pulsed atrazine exposures on autotrophic community structure, biomass, and production in field‐based stream mesocosms
We performed a multiple‐pulsed atrazine experiment to measure responses of autotrophic endpoints in outdoor stream mesocosms. The experiment was designed to synthetically simulate worst‐case atrazine chemographs from streams in agricultural catchments to achieve 60‐day mean concentrations of 0 (control), 10, 20, and 30 µg/L, respectively. We dosed triplicate streams with pulses of 0, 50, 100, ...
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The role of a hybrid phytosystem in landscape water purification and herbicides removal
The performance of a hybrid phytosystem in landscape water purification and herbicides removal was investigated. The phytosystem operating in an arboretum is located in the Minhang Campus of Shanghai Jiao Tong University, China. The phytosystem is composed of two purification stages: sedimentation Stage 1 without external air supply; and Stage 2 with an external air supply. Stage 2 is also ...
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Cultivation of rice for animal feed with circulated irrigation of treated municipal wastewater for enhanced nitrogen removal: comparison of cultivation systems feeding irrigation water upward and downward
To achieve enhanced nitrogen removal, we modified a cultivation system with circulated irrigation of treated municipal wastewater by using rice for animal feed instead of human consumption. The performance of this modified system was evaluated through a bench-scale experiment by comparing the direction of circulated irrigation (i.e. passing through paddy soil upward and downward). The modified ...
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Regulation of nitrogen contents of Composts during composting first experimental results
More than 3 Mio. Mg of compost were produced in Germany in 1998 (Wiemer and Kern 1998). Kitchen and garden waste from households as well as waste from landscaping and parks were used as substrates to a high extent. The composts were mainly used in landscaping, recultivation, horticulture, substrate production and in agriculture. Applied on cultivable land compost can improve the soil structure ...
By ORBIT e.V.
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Influence of temperature during the initial phase of Composting on biological activity and emission of Ammonia and dinitrogen oxide
Composting is a robust and cheap biological treatment method useful for all solid biodegradable waste. The performance of composting can vary substantially depending on managing conditions such as oxygen supply and compost temperature. Oxygen and temperature affects the rate of degradation and may also influence emission of NH3 and N2O. The gaseous N losses during composting from organic ...
By ORBIT e.V.
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What nutrients are left in your soil?
Knowing, not estimating , means better soil health and profitability Farming in Western Canada means working in a climate of extremes–hot or cold, wet or dry. It’s a conundrum that drives agriculture innovation, new technologies and precision agronomy practices on behalf of Prairie farmers that’s appreciated around the world. Last year, many farmers worked to deal with extreme ...
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Chicken slaughterhouse
Country: U.S. Problem: Poor final effluent quality Product: BFL 5100HP Background A chicken slaughterhouse was killing 10,000 chickens per day. Final effluent was discharged to a stream. The final effluent COD was exceeding the discharge limit of 100mg/L and as a result it had to be tankered off site and spread on agricultural land. Obviously this was costly and not sustainable as a medium to ...
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Slaughterhouse case study
Slaughterhouse in Ireland, part of an international group, found themselves unable to comply with their effluent discharge consent levels following the introduction of legislation adopting EU Environmental Directives. The slaughterhouse, on average, processes 200 sheep per day. The plant produces an effluent flow of approximately 200 m3/day and this, after treatment, is discharged into a river. ...
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Formation and emissions of ammonia and greenhouse gases from stored and composted solid animal manure
Beside other branches of industry, agriculture is an important source of methane (CH4) and nitrous oxide (N2O) emissions and the most important source of ammonia (NH3). In spite of several investigations concerning ammonia and greenhouse gas emissions during storage and composting of liquid and solid animal manure, the real extent of these emissions is still unknown. This is mainly because of the ...
By ORBIT e.V.
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Nitrapyrin
Nitrapyrin is an organic compound with the formula ClC5H3NCCl3. It is a widely used nitrification inhibitor in agriculture as well as a soil bactericide and has been in use since 1974. Nitrapyrin was put up for review by the EPA and deemed safe for use in 2005. Since nitrapyrin products is an effective nitrification inhibitor to the bacteria nitrosomonas it has been shown to drastically the ...
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Case study - Meat processing
The client Our client produces and sells a variety of beef products, including fresh, frozen, canned, both vacuum packed or packaged in a protective atmosphere. They also offer a completerange of cuts and processed hamburgers, ready pre-cooked meals, veal cutlets, grilled and roasted products. The company is the market leader in the frozen hamburger sector, with an annual production capacity of ...
By IDRAFLOT
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Return on Investment in Variable Rate Technology is About a Lot More Than Yield
Delivering value to your farm When you invest hard-earned dollars into new farm technologies, you’d better believe you want to see that value returned to your pockets. But the ways that value shows up are many, and not always so plain to see. With that, many ask: what return on investment (ROI) does variable rate technology (VRT) deliver for my farm? The truth is, it’s a loaded ...
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