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... In this study, aluminum-based P-inactivation agent (Al-PIA) was used as a high-efficiency microbial carrier, and the biological Al-PIA (BA-PIA) was prepared by artificial aeration. Laboratory static experiments were conducted to study the effect of BA-PIA on reducing nitrogen and phosphorus contents in water. Physicochemical characterization and isotope tracing method were applied to analyze the r ...
nitrification, etc ; ambient temperature; boron; sludge; Show all 4 Subjects
Abstract:
... The stable and rapid initiation of partial nitrification is a long-term interest of researchers. In this study, boron, an activator of autoinducer-2 (AI-2), was first proposed to promote partial nitrification and improve sludge properties. Two concentrations of boron were added to six laboratory-scale nitrification reactors to study the effects of boron stimulated AI-2-mediated quorum sensing on n ...
Cecile A. M. de Klein; Saman Bowatte; Priscila L. Simon; Jacobo Arango; Laura M. Cardenas; David R. Chadwick; Jeroen Pijlman; Robert M. Rees; Karl G. Richards; Guntur V. Subbarao; David Whitehead
nitrification, etc ; livestock; metabolomics; nitrous oxide; soil; Show all 5 Subjects
Abstract:
... This position paper summarizes the current understanding of biological nitrification inhibition (BNI) to identify research needs for accelerating the development of BNI as a N₂O mitigation strategy for grazed livestock systems. We propose that the initial research focus should be on the systematic screening of agronomically desirable plants for their BNI potency and N₂O reduction potential. This r ...
nitrification; nitrification inhibitors, etc ; activated sludge; active ingredients; biodegradation; biotransformation; denitrification; diclofenac; environment; metabolites; microbial communities; municipal wastewater; phosphorus; toxicity; Show all 14 Subjects
Abstract:
... Diclofenac is a pharmaceutical active compound frequently detected in wastewater and water bodies, and often reported to be persistent and difficult to biodegrade. While many previous studies have focussed on assessing diclofenac biodegradation in nitrification and denitrification processes, this study focusses on diclofenac biodegradation in the enhanced biological phosphorus removal (EBPR) proce ...
... Thiourea is used in agriculture and industry as a metal scavenger, synthetic intermediate, and nitrification inhibitor. However, in wastewater, it can inhibit the nitrification process and induce the collapse of the nitrification system. In such a case, ammonia-oxidizing bacteria (AOB) lose their ability to remove ammonia. We investigated the nitrification system of a 60,000-t/d municipal sewage t ...
nitrification, etc ; denitrification; mariculture; nitrogen; sulfamethoxazole; technology; wastewater; Show all 7 Subjects
Abstract:
... This study investigated the removal of nitrogen and sulfamethoxazole (SMX), and the microbial communities in a partially saturated vertical flow constructed wetland (PS-VFCW) fed with synthetic mariculture wastewater operated at different saturated zone depths (SZDs), i.e. 51, 70, and 60 cm. Removal efficiencies were 99.8%-100.0% for COD, 34.1%-100.0% for NH₄⁺-N, 67.8%-97.3% for total inorganic ni ...
nitrification; nitrification inhibitors, etc ; 3,4-dimethylpyrazole phosphate; Nitrosospira; acid soils; ammonia; calcareous soils; clay fraction; community structure; ecological differentiation; pH; propionic acid; Show all 12 Subjects
Abstract:
... An aerobic ¹⁵N microcosmic experiment was conducted to compare the inhibitory effects of the biological nitrification inhibitor (BNI), methyl 3-(4-hydroxyphenyl) propionate (MHPP) at rates of 500 and 1000 mg kg⁻¹ with the synthetic nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) at 1% of applied NH₄⁺, on the gross nitrification rate (n_gᵣₒₛₛ) and on the abundance and community compos ...
nitrification, etc ; acetylene; ammonia; genes; nitrogen content; soil pH; Show all 6 Subjects
Abstract:
... Although autotrophic ammonia oxidizing archaea (AOA) and bacteria (AOB) and comammox coexist in soils, their abundances and contributions to nitrification are not well addressed, especially in arable black soils. In this study, using the nitrification inhibitors acetylene and octyne, the contributions to nitrification potential provided by different ammonia oxidizers and heterotrophic nitrifiers i ...
nitrification, etc ; aeration; denitrification; municipal wastewater; nitrites; nitrogen; technology; Show all 7 Subjects
Abstract:
... In this study, intermittent aeration strategy was investigated in a plug-flow reactor on real municipal wastewater. Over 200 days of operation, the total inorganic nitrogen (TIN) removal efficiency of 72.43 ± 7.56% was achieved with a total aerobic hydraulic retention time in the range 2.4–3.0 h under a low C/N ratio of 3.19. The batch tests showed that the activity of nitrite oxidizing bacteria ( ...
nitrification, etc ; greenhouse production; greenhouses; nitrogen; total nitrogen; vegetables; Show all 6 Subjects
Abstract:
... AIMS: The understanding of the interactions between N transformations and N uptake by plants in greenhouse soils with large N accumulation is still not clear. The aim is to understand the plant- soil interactions (vegetables) on N transformations with respect to N supply. METHODS: ¹⁵N tracing studies were conducted in two greenhouse soils to simultaneously quantify soil gross N transformation and ...
... The type, functions, and mechanisms of biological nitrification inhibitors (BNIs) from rice were investigated using a combination of chemical and molecular techniques, bacterial bioassays, and soil microcosm experiments. We report the discovery of an effective nitrification inhibitor, syringic acid, in the root exudates of rice. Nitrification inhibition activity by syringic acid was verified in bo ...
nitrification, etc ; aeration; energy; nitrogen; oxidation; oxygen; phosphorus; wastewater treatment; Show all 8 Subjects
Abstract:
... Recent research has shown the adaptability of Biological Nutrient Removal (BNR) systems to very low level dissolved oxygen (DO) concentration, mainly focusing in the nitrification ability that maintains the nitrogen oxidation process even at very low DO levels. Although step-wise aeration decrease on Enhanced Biological Phosphorus Removal (EBPR) is not fully comprehended. This study investigated t ...
nitrification, etc ; ammonia; chlorine; environment; nitrites; regrowth; remediation; water supply; Show all 8 Subjects
Abstract:
... The two most commonly adopted strategies, rechlorination (addition of chlorine) and rechloramination (addition of chlorine and ammonia), to recover and stabilise chloramine from nitrification were comprehensively evaluated in laboratory- and full-scale systems. Laboratory-scale batch experiments were conducted in a nitrifying sample (~0.05 mg-N/L). In the full-scale service reservoir, repeated rec ...
nitrification; nitrification inhibitors, etc ; 3,4-dimethylpyrazole phosphate; ammonium; ammonium nitrogen; bioactive properties; dicyandiamide; field experimentation; half life; nitrogen; nitrogen fertilizers; nutrient use efficiency; soil; sulfates; zinc; Show all 15 Subjects
Abstract:
... PURPOSE: Nitrification inhibitor plays an important regulatory role in inhibiting the nitrification of ammonium in soils. However, most of nitrification inhibitors lack the sustainable effects in suppressing the nitrification of ammonium. In this study, a novel DMS nitrification inhibitor was prepared and tested to explore its lasting effect of nitrification suppression in black soil. MATERIALS AN ...
nitrification, etc ; Triticum aestivum; ammonium; biochemistry; mineralization; nitrates; oxidation; soil; wheat; Show all 9 Subjects
Abstract:
... Plants with ammonium preference are able to exude biological nitrification inhibitors to reduce nitrification keeping the mineral N in NH₄⁺ form. The question is whether plants with a NO₃⁻ preference are able to stimulate nitrification to shift mineral N towards NO₃⁻ production to meet their NO₃⁻ demand. In this study we attempted to solve this conundrum by conducting ¹⁵N tracing studies in a rang ...
nitrification, etc ; denitrification; grasslands; meta-analysis; nitrogen; nitrous oxide; soil; temperature; Show all 8 Subjects
Abstract:
... Functional genes involved in nitrogen (N) cycling regulate soil nitrification, denitrification and N₂O emissions. However, the general patterns and variability of N functional genes in response to N addition, and their association with N₂O emission have not been synthesized for terrestrial ecosystems. We synthesized 2068 observations from 144 papers to explore the impact of N addition on the abund ...
nitrification, etc ; ammonia; fluorescence; genes; membrane potential; microplastics; nitrites; oxidation; polystyrenes; Show all 9 Subjects
Abstract:
... Two sizes of polystyrene (PS) were compared to investigate their impact on nitrification. The smaller PS (50 nm) had a higher impact than the larger PS (500 nm). Lower NO₂⁻ and NO₃⁻ accumulation was observed in the 50 nm PS treatment. There was no significant difference in DIN concentration between the control and 500 nm PS treatments. PS treatment did not have a significant influence on the speci ...
nitrification; nitrification inhibitors, etc ; 3,4-dimethylpyrazole phosphate; agricultural soils; brown rice; cadmium; dicyandiamide; food chain; human health; nitrogen; nutrient use efficiency; pH; paddy soils; phytoaccumulation; rapeseed; research; urea; Show all 17 Subjects
Abstract:
... Cadmium (Cd) is one of the most harmful and widespread pollutants in agricultural soil, where it is readily taken up by plants and threatens human health through the food chain. Nitrification inhibitors (NIs) are usually used to reduce nitrogen (N) loss in soil and increase the nitrogen use efficiency of crops. However, information regarding the Cd transfer in soil and crops system with the applic ...
nitrification, etc ; carbon; denitrification; pyrite; sewage; slags; steel; technology; total nitrogen; zeolites; Show all 10 Subjects
Abstract:
... The aerobic properties of nitrification and the anaerobic properties of denitrification in constructed wetlands are difficult to reconcile. In this study, two constructed wetlands were constructed with pyrite and steel slag in combination with zeolite, and their respective nitrification and denitrification capacities were evaluated under different tidal strategies. The steel slag wetland achieved ...
nitrification, etc ; Nitrosomonas; ammonium; dissolved oxygen; hydroxylamine; nitrites; nitrogen; research; sludge; water; Show all 10 Subjects
Abstract:
... Hydroxylamine is a nitrogen intermediate of ammonium oxidizing bacteria (AOB) that can transiently accumulate during nitrification. The impact of hydroxylamine on aerobic ammonium oxidations is still obscure. In the present study the short and long term impact of hydroxylamine on partial nitritation granular sludge was investigated. Dissolved oxygen was the governing factor determining the hydroxy ...