Currently, magnetization technology in treatment and improvement of saline water quality has been studied extensively in the world. This is considered an economic solution, bringing effective treatment of saline irrigation water, improving crop yields and bringing about high efficiency in soil salinization. Therefore, the study was initially carried out to: (i) Evaluate the effectiveness of saline water treatment of the electromagnetic system combining oxidation and molecular impact and (ii) Evaluate the effectiveness of irrigation water. Magnetic fields in improving salinity alluvial soil chemistry, growth, and yield of vegetable (Brassica juncea L.) grown under greenhouse conditions.
Three levels of artificially salinized river water were tested by diluting the “oop” water with the non-saline river water into water samples of different salinities (0‰, 3‰ and 5‰); then, for magnetic treatment by running 2 times through the integrated electromagnetic field treatment system (2000-4000 Gauss, electrolysis 5-12 volts, 0.8 Amp, flow 2-3 m3/hr) . The design method of an electromagnetic treatment system for saline water has an arrangement of the system including: (1) gas mixing, (2) permanent magnets (3000 Gauss) and (3) electrolysis tank ( 8 Volt and 0.8 Amp) are aligned parallel to each other, then the flows will be remixed (4) molecular impactor before collecting the treated water sample for analysis.
Indicators, methods of analyzing the quality of saline water before and after treatment: The quality of the input water samples (before treatment) and the output (after treatment) of the integrated electromagnetic field treatment system will collected and analyzed within the same day to check water quality indicators such as: pH, EC, Na+, K+, Ca2+, Mg2+, HCO3–, Cl–, SO42-, SAR, TDS.
Water conductivity (EC) before and after electromagnetism (XL) treatment.
after electromagnetic field treatment.
TrSAR value of saline water before and after electromagnetism (XL) treatment.
Note: () and (*) are statistically different before and after electromagnetic treatment of saline water at 5% and 1% significance level through paired t-test, MiniTab/Version 16 software ; vertical bar: represents standard deviation (n = 12 repeats for river water samples).
when dealing with electromagnetic fields.
(XL) electromagnetism.
Notes: TDS: Total Dissolve Solid; (*) statistical difference before and after electromagnetism treatment of saline water at 5% significance level through paired t-test, MiniTab/Version 16 software; “ns”: no statistical difference; vertical bar: represents standard deviation (n = 12 repeats for river water samples).
The experiment of growing cabbage in a pot (containing 10 kg of saline soil) was arranged in a completely randomized design (CRD), 4 replicates for 4 types of irrigation water (conventional water supply, electromagnetic field treatment water supply, saline water). 3‰ and 3‰ saline water treated with electromagnetic fields). Experimental results show that electromagnetic field treatment significantly improves the quality of saline water: reducing salinity (EC) of water, especially at salinity level 3‰, reducing sodium adsorption ratio (SAR). and total dissolved solids (TDS) in the treated water (6.2%, 8.0% and 7.9% on average for EC, SAR and TDS).
The results also showed a significant decrease in the content of dissolved ions (Na+, K+,Mg2+, SO42-, Cl–, HCO3–) in saline water after treatment at three different levels of salinity. Experimental results in pots show that water treated with electromagnetic fields (feed water or saline water 3‰) can be used in improving soil salinity: reducing ECe, reducing sodium adsorption ratio (SAR). ). In particular, the supply water was treated with electromagnetic field, which significantly reduced the exchangeable Na+ content in the soil (0.64 meq Na+/100g; 52.9% reduction in the soil at the beginning of the crop) compared to the conventional watering treatment. (0.77 meq Na+/100g; down 36.4% of land at the beginning of the crop). This, in turn, contributes to a decrease in the sodium exchange capacity (ESP) of the soil. Irrigation with electromagnetic field treatment (supply water, saline water) did not affect the content of exchangeable cations (Ca2+, Mg2+) and the cation adsorption capacity of the soil (CEC). Magnetic irrigation is also significant in reducing Cl– and SO42- concentrations in saline soils. Initially, it was shown that watering with electromagnetic field treatment increased plant height (3.3%-7.5%) and leaf width (9.5%-12.1% increase) of broccoli. Thereby, contributing to the improvement of fresh yield (average increase of 6.6%) and dry biomass (average increase of 12.0%) of experimental broccoli compared with direct irrigation of salt water without electromagnetic field treatment. .
harvest time.
Note: In the same column, numbers followed by the same letters are not different at 1% significance level, p < 0.01 (**) according to Tukey/MiniTab/Version 16 test, n = 4 replicates for each treatment; TL: Weight; SPAD: Soil Plant Analysis Development
on growth of broccoli grown on saline soils under net house conditions.
The initial results of treatment of saline river water show that electromagnetic fields can be used to improve the quality of saline irrigation water (pH, EC salinity, SAR index, TDS, dissolved cations and anions) with Water salinity can increase to 5‰. However, the treatment performance is best when the water salinity is 3‰. Electromagnetic treated water (feed water, saline water 3‰) can be used for irrigation, improving soil salinity such as: reducing ECe, reducing sodium adsorption ratio (SAR) and exchange capacity sodium exchange (ESP) of the soil, reducing the exchangeable Na+ content in the soil colloid, reducing the Cl– and SO4 2- concentrations in saline soils, which did not affect the exchangeable cations content (Ca2+, Mg2+) and cation adsorption capacity of the soil (CEC). This result shows that electromagnetic field treatment technique can be proposed to be applied to treat poor quality saline irrigation water for farmers in the coastal provinces of the Mekong Delta.
Nguyen Thi Van
Đăng ngày: 23/01/2020