Reliability of an Ammonia Probe for Electrometric Determination of Total Ammonia Nitrogen in Fish Tanks

1973 ◽  
Vol 30 (9) ◽  
pp. 1389-1392 ◽  
Author(s):  
Jan Barica
Keyword(s):  
Ammonia Nitrogen ◽  
Ammonium Ion ◽  
Absolute Difference ◽  
Membrane Electrode ◽  
Permeable Membrane ◽  
Mean Absolute Difference ◽  
Total Ammonia ◽  
Subsequent Measurement ◽  
Fish Tanks

The method involves an alkalization of a sample to pH 12 and subsequent measurement of liberated un-ionized ammonia with a gas-permeable membrane electrode. Total ammonia is measured directly rather than ammonium ion. Tests on different samples of water from aquaria and fish tanks showed a mean absolute difference of ±8.3% as compared with the phenolhypochlorite method in the concentration range of 0.5–5.1 mg/liter NH3-N. The lowest level of detection was 0.1 mg/liter NH3-N.

scholarly journals Application of Gas-Permeable Membranes For-Semi-Continuous Ammonia Recovery from Swine Manure

Environments ◽  
2019 ◽  
Vol 6 (3) ◽  
pp. 32 ◽  
Author(s):  
Berta Riaño ◽  
Beatriz Molinuevo-Salces ◽  
Matías B. Vanotti ◽  
María Cruz García-González
Keyword(s):  
Acidic Solution ◽  
Membrane Surface ◽  
Swine Manure ◽  
Ammonia Nitrogen ◽  
Nitrogen Loading ◽  
Membrane Technology ◽  
Continuous Mode ◽  
Permeable Membrane ◽  
Total Ammonia Nitrogen ◽  
Total Ammonia

Gas-permeable membrane technology is a new strategy to minimize ammonia losses from manure, reducing pollution and recovering N in the form of an ammonium salt fertilizer. In this work, a new operational configuration to recover N using the gas-permeable membrane technology from swine manure was tested in a semi-continuous mode. It treated swine manure with a total ammonia nitrogen (TAN) concentration of 3451 mg L−1. The system was operated with low aeration rate (to raise pH), and with hydraulic retention times (HRT) of seven days (Period I) and five days (Period II) that provided total ammonia nitrogen loading rate (ALR) treatments of 491 and 696 mg TAN per L of reactor per day, respectively. Results showed a uniform TAN recovery rate of 27 g per m2 of membrane surface per day regardless of the ALR applied and the manure TAN concentration in the reactor. TAN removal reached 79% for Period I and 56% for Period II, with 90% of recovery by the membrane in both periods. Water capture in the acidic solution was also uniform during the experimental period. An increase in temperature of 3 °C of the acidic solution relative to the wastewater reduced 34% the osmotic distillation and water dilution of the product. These results suggested that the gas-permeable membrane technology operating in a semi-continuous mode has a great potential for TAN recovery from manure.

scholarly journals The Utilization of Pineapples Waste Enzyme for the Improvement of Hydrolysis Solubility in Aquaculture Sludge

2019 ◽  
Vol 1 (2-2) ◽  
Author(s):  
M. Fatma Syahirah ◽  
R. Nazaitulshila
Keyword(s):  
Anaerobic Digestion ◽  
Treatment Time ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Ammonia Nitrogen ◽  
Plastic Container ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Total Ammonia

High volumes of sludge discharge from the aquaculture industry have relatively high pollutant content that may lead to severe local environmental problems. Anaerobic digestion is one of the technologies for sludge treatment that might be an efficient method to reduce salty aquaculture sludge production load. However, hydrolysis solubility is becoming a limitation step during the anaerobic digestion process when the occurrence of intermediate accumulation resulted from the conversion of non-soluble biopolymers to soluble organic compounds. Thus, pretreatment is required to increase the solubilization of pollutant parameters from aquaculture sludge before it is further treated in the anaerobic treatment. Therefore, this study focuses on the production of biocatalytic enzyme from the fermentation of pre-consumer supermarket waste such as pineapple dregs to increase the solubility of aquaculture sludge. The fermentation of the pineapples waste was produced via a three-month fermentation of the mixture of molasses, pineapple dregs and water, with the ratio of 1:3:10 in a tight plastic container. Apart from that, analyses showed that the enzyme possessed lipase, amylase and protease activity. The sludge solubilization pretreatment was performed at different pH values, with treatment time for 120 hours and the solubilization was evaluated by determination of Chemical Oxygen Demand (COD) and Total Ammonia Nitrogen (TAN) solubilization; the solubilization of COD and TAN increased by 80% and 50%, respectively. This finding showed that the pineapple enzyme has the capability to solubilize organic compound, which has the potential to improve hydrolysis in further anaerobic digestion process.

scholarly journals Potentiometric determination of total nitrogen in soils by flow injection analysis with a gas-diffusion unit

Soil Research ◽  
1996 ◽  
Vol 34 (4) ◽  
pp. 503 ◽  
Author(s):  
AMR Ferreira ◽  
J Lima ◽  
A Rangel
Keyword(s):  
Total Nitrogen ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Sampling Rate ◽  
Gas Diffusion ◽  
Ammonium Ion ◽  
Selective Electrode ◽  
Buffer Solution ◽  
Permeable Membrane

A flow injection analysis (FIA) system incorporating a gas-diffusion unit and a potentiometric detector was developed for the determination of total nitrogen in soil digests. The solutions obtained from the Kjeldahl digestion of the soil samples were injected in the FIA system where ammonium was converted into ammonia. This gas diffused through a gas-permeable membrane to a buffer acceptor stream, allowing the separation of the gas from the rest of the sample. Once in contact with the buffer solution, ammonia was reconverted into ammonium and finally led to a tubular ammonium ion-selective electrode constructed for this purpose. The potentiometric detector is a PVC tubular selective electrode without inner reference solution, and with the sensor system composed of monactin in Tris (2-ethylhexyl) phosphate. Good agreement was obtained between the results provided with the developed FIA system and those from the classical Kjeldahl distillation/titration step, with relative deviations between the 2 methods always < 5%. A sampling rate of 80 determinations/h was achieved with good reproducibility for consecutive injections of soil digests (coefficients of variation < 3%).

scholarly journals Ammonia Recovery from Digestate Using Gas-Permeable Membranes: A Pilot-Scale Study

Environments ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 133
Author(s):  
Berta Riaño ◽  
Beatriz Molinuevo-Salces ◽  
Matías B. Vanotti ◽  
María Cruz García-González
Keyword(s):  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Land Application ◽  
Frequent Change ◽  
Permeable Membrane ◽  
A Value ◽  
Trapping Solution ◽  
Ammonia Recovery ◽  
Total Ammonia ◽  
Eu Project

The reduction and recovery of nitrogen (N) from anaerobically digested manure (digestate) is desirable to mitigate N-related emissions, mainly ammonia and nitrate, derived from digestate land application in nutrient-saturated zones. This work reports the results of a gas-permeable membrane (GPM) pilot-scale plant to recover ammonia from digestate in the framework of the EU project Ammonia Trapping. The total ammonia nitrogen (TAN) concentration in digestate was reduced by 34.2% on average (range 9.4–57.4%). The recovery of TAN in the trapping solution in the form of a (NH4)2SO4 solution averaged 55.3% of the removed TAN, with a TAN recovery rate of 16.2 g N m−2 d−1 (range between 14.5 and 21.0 g N m−2 d−1). The TAN concentration in the trapping solution achieved a value of up to 35,000 mg N L−1. The frequent change of the trapping solution has been proven as an efficient strategy to improve the overall performance of the GPM technology.

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