Reflection on Jarvis (2007), “Review of non-equilibrium water flow and solute transport in soil macropores: Principles, controlling factors and consequences for water quality”. European Journal of Soil Science, 58, 523-546

2020 ◽  
Vol 71 (3) ◽  
pp. 303-307
Author(s):  
Nicholas Jarvis
Keyword(s):  
Water Quality ◽  
Solute Transport ◽  
Water Flow ◽  
Controlling Factors ◽  
Soil Science ◽  
Non Equilibrium

Radon removal by aeration: observations on testing, installation and maintenance of domestic treatment units

2009 ◽  
Vol 9 (4) ◽  
pp. 469-475
Author(s):  
T. Turtiainen
Keyword(s):  
Water Quality ◽  
Water Flow ◽  
Removal Efficiency ◽  
Flow Rate ◽  
Test Protocol ◽  
Household Water ◽  
Medium Flow ◽  
Removal Efficiencies ◽  
Frequent Sampling

Radon is one of the contaminants that sometimes impair the water quality of wells, especially those drilled in bedrock. Domestic radon removal units based on aeration have been commercially available for more than ten years. In order to determine how effectively these units remove radon a new test protocol applying frequent sampling while letting 100 litres of water flow, was developed. This way, removal efficiencies can be more accurately calculated and possible malfunctions detected. Seven models of domestic aerators designed for removing radon from household water were tested. The aerators were based on diffused bubble aeration, spray aeration or jet aeration. The average removal efficiencies for 100 litres with a medium flow rate were 86–100% except for a unit that circulated the aerated water back to the well that had removal efficiency of 80% at the maximum. By conducting a questionnaire study usual problems related to the aeration units were localized and recommendations on maintenance and installation are given accordingly.

scholarly journals Electron generation in water induced by magnetic effect and its impact on dissolved oxygen concentration

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Augustine Chung Wei Yap ◽  
Hwang Sheng Lee ◽  
Joo Ling Loo ◽  
Nuruol Syuhadaa Mohd
Keyword(s):  
Water Quality ◽  
Hydrogen Bonding ◽  
Dissolved Oxygen ◽  
Electron Density ◽  
Water Flow ◽  
Magnetic Effect ◽  
Water Quality Control ◽  
Electron Generation ◽  
Magnetic Effects ◽  
Do Concentration

AbstractpH, oxidation-reduction potential (ORP) and dissolved oxygen (DO) concentration are important parameters in water quality surveillance and treatment. The changes of these parameters are associated with electron density in water. Several techniques including electrolysis and catalysis which require redox reactions and electron exchange are employed to improve these parameters. In recent years, studies reported that magnetic effects can impart considerable changes on the pH, ORP and DO concentration of water. However, the correlation between electron density and magnetic effects on these parameters has yet to be disclosed despite the fact that increased electron density in water could improve water’s reductive properties, heat capacity and hydrogen bonding characteristics. In this study, the magnetic effects on pH, ORP and DO concentration were investigated using different magnets arrangements and water flow rates based on reversed electric motor principle. Results showed that the improvement of pH, ORP and DO concentration from 5.40–5.42 to 5.58–5.62 (+ 3.5%), 392 to 365 mV (− 6.9%), and 7.30 to 7.71 mg L− 1 (+ 5.6%), respectively were achieved using combined variables of non-reversed polarity magnet arrangement (1000–1500 G magnetic strength) and water flow rate of 0.1–0.5 mL s− 1. Such decrement in ORP value also corresponded to 8.0 × 1013 number of electron generation in water. Furthermore, Raman analysis revealed that magnetic effect could strengthen the intermolecular hydrogen bonding of water molecules and favor formation of smaller water clusters. The findings of this study could contribute to potential applications in aquaculture, water quality control and treatment of cancer attributed to free radical induced-oxidative stress.

Effects of Flow Depth on Water Flow and Solute Transport in Furrow Irrigation: Field Data Analysis

2003 ◽  
Vol 129 (4) ◽  
pp. 237-246 ◽  
Author(s):  
Fariborz Abbasi ◽  
Floyd J. Adamsen ◽  
Douglas J. Hunsaker ◽  
Jan Feyen ◽  
Peter Shouse ◽  
...  
Keyword(s):  
Data Analysis ◽  
Solute Transport ◽  
Water Flow ◽  
Field Data ◽  
Furrow Irrigation ◽  
Flow Depth ◽  
Field Data Analysis

scholarly journals A coupled model for simulating water flow and solute transport in furrow irrigation

2019 ◽  
Vol 213 ◽  
pp. 792-802 ◽  
Author(s):  
Kun Liu ◽  
Guanhua Huang ◽  
Xu Xu ◽  
Yunwu Xiong ◽  
Quanzhong Huang ◽  
...  
Keyword(s):  
Solute Transport ◽  
Water Flow ◽  
Coupled Model ◽  
Furrow Irrigation
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