Decrease in total hardness and amount of chlorides present in well water: influence of the aquatic plants of Phragmites australis and Lemna minor [Disminución de dureza total y cantidad de cloruros presentes en las aguas de pozos: influencia de las plantas acuáticas de Phragmites australis y Lemna minor]

The objective of present work was evaluating the influence Phragmites australis (common reed) and Lemna minor (duckweed) aquatic plants in the reduction of total hardness and chlorides present in the waters of wells of Huanchaquito- Trujillo. They are used by the inhabitants to irrigate crops and own consumption, affecting their health and having low production in their fields. The aquatic plants used for the treatment of well water, according to background, have a high yield in salt absorption which has allowed to decrease the amount of Chlorides and hardness present at the well’s waters of Huanchaquito every 15 days for 8 months. The data obtained in the analyses of the initial samples were: With respect to hardness 542,7 ppm; Cl- amount 300,7 ppm. After the average data obtained for the hardness were of 502,4 ppm with Lemna minor only 537,6ppm, with Phragmites australis only and 489,8 ppm with Lemna minor and Phragmites australis, In terms of the results of chlorides we have: 296,9 ppm with Lemna minor only, 248,8 ppm with Phragmites australis only and 233,8ppm with Lemna minor and Phragmites australis.

Investigated of Desalination of Saline Waters by Using Dunaliella Salina Algae and Its Effect on Water Ions

Nowadays, due to augmentation of population and expansion of cities and the limitation of fresh water sources in the world, existing water resources cannot meet the human needs. Desalination or reduction of salinity of water through biological methods involves the use of plant species, microorganisms, algae or a combination of them, which can be effective in reducing water salinity. The objective of this study was to investigate the desalination of saline waters by using Dunaliella salina algae. For this purpose, the experiments were carried out as factorial based on completely randomized design. The expected tests were conducted in a laboratory controlled condition for humidity, light and temperature (90 days). During this research, the Electrical Conductivity (EC) was measured daily. The results showed that salt absorption in Dunaliella salina algae was significantly different. High salt absorption was observed in Dunaliella salina at a concentration of 130mS.cm-1. Due to the constant humidity, light and temperature, salt removal from saline water was observed in laboratory conditions. The results of this study indicate that significant reduction of chlorine, sodium and bicarbonate levels were observed using Dunaliella salina algae. According to the results of this study, it seems that reducing salt absorption in algae is due to the use of salt in the metabolism and the growth and proliferation of algae. The absorption process in this study showed that the catch of Dunaliella salina has a good ability to remove salt and can be used as an appropriate suggestion for salt removal from saline water.

A dual-ion electrochemistry deionization system based on AgCl-Na0.44MnO2 electrodes

A novel dual-ion electrochemical deionization was reported based on an AgCl-NMO system, which possesses a stable salt absorption/desorption capacity of 57.4 mg g−1.

Study on Absorbency and Strength of the Carboxymethyl Medical Cotton Gauze

Based on the carboxymethyl reaction of the medical cotton gauze, the paper analyzed absorbency and strength of the carboxymethyl medical cotton gauze. According to different concentrations of sodium hydroxide, molar ratio of sodium hydroxide and chloroactic acid, and mass ratio of chloroactic acid and cotton gauze, we found the best conditions on the excellent absorbency and strength of the carboxymethyl medical cotton gauze. It`s shown that, when the concentration of sodium hydroxide is 20%, the molar ratio of sodium hydroxide and chloroactic acid is 2.7:1, and the mass ratio of chloroactic acid and cotton gauze is 1.5:1, the substitution degree of the carboxymethyl cotton gauze will be 0.2132, the water absorption will be 370.5%, the salt absorption will be 292.3% and the breaking force will be 181.8N. After the carboxymethyl reaction of proper condition, the cotton gauze possesses the excellent mechanical properties based on the good absorbency.