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Due to the scarcity of water resources and the harmful effects of sewage on water bodies, water purification becomes an important issue. The application of ultrasonic waves is a novel technique developed for water purification. This technology works as an advanced method of oxidation, contributing to the elimination of various types of contaminants. The basic principle of ultrasound is based on the destruction of both bacterial cells and difficult todegrade organics. A brief overview of water purification methods, application of ultrasound, ultrasound waves theory and the benefits and drawbacks of using ultrasound waves in water purification will be discussed in this article. In addition, the role of ultrasound waves in the degradation of various organic contaminants, microbial pollutant disinfection, and other pollutants removal.

A novel adsorbent, magnetic nanoparticle (-Fe 2 O 3 )-coated zeolite (MNCZ), was prepared for the removal of arsenic (As) ions from aqueous solution. The influence of different sorption parameters, that is, contact time, acidic reaction (pH) and initial arsenic concentration were studied using batch equilibrium techniques. The results obtained showed that the MNCZ was effective for the removal of As from aqueous solution, and the percentage removal of As could reach over 95.6% at a pH value of 2.5 within 15 min. Moreover, the removal of As depended on the initial concentration of As. For the regeneration of MNCZ material, 0.1 M NaOH was suitable for the desorption of As (70% after 15 min), and the regenerated material showed an adsorption capacity of 93.95% within five cycles. We concluded that MNCZ presents a reusable adsorbent for a fast, convenient and highly efficient removal of As from aqueous solution.

<p>Scientists reported that biochar can improve soil properties in acidic soils, while in alkaline soils were shown negative results. A field study was done to evaluate the effect of biochar application solely in alkaline soil compared with biochar composts with farm yard manure (BC-FYM) and sulfur (BC-S). The results revealed that using solely biochar decreased yield of potatoes tubers to more than 6 % and 10 % using mineral and organic fertilization, respectively. This was attributed to the alkalinity effect of biochar and raises the soil pH, which might precipitate macro and micro elements in soil and become unavailable for plant absorption. While using mixtures of BC-FYM and BC-S were shown to enhance yield productivity of potatoes tubers 11.7 % and equal to control under mineral fertilization; and 25.13 % and 10.53 % using organic fertilization, respectively. Mixture of BC-FYM and BC-S proved to have the ability for recovering the alkalinity effect of biochar, improve nutrients availability in soil and increase crop yield of potatoes. In general, mixing biochar with FYM was efficient, economical and environmentally sound solution in alkaline soils.</p>

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