The capacity of activated carbons obtained from different raw materials, such as sugarcane bagasse, babassu (Orbygnia speciosa), and coconut (Cocus nucifera) shells, to remove residual chlorine is studied. The influence of particle size and time of contact between particles of activated carbon and the chlorinated solution were taken into account. The adsorptive properties of the activated carbons were measured by gas adsorption (BET method), using an ASAP 2010 porosimeter, and liquid phase adsorption, employing iodine and methylene blue adsorbates. The activated carbon from sugarcane bagasse was the only adsorbent capable of removing 100% of the residual chlorine.

Considering the water scarcity problems facing many countries, the need for water reuse can make activated carbon (AC) an essential product for modern society. In this context, to contribute with better activated carbons that could be used to serve in water treatment, this article discusses these materials production, using bamboo as raw material, and analyses their application effectiveness. The bamboo was collected, transformed into activated carbon, by simultaneous chemical and physical activations, and named H₃PO₄/H₂OAC. The obtained material was characterized by its yield, apparent density, ash content, thermogravimetric analysis, surface area, methylene blue and iodine indexes, pH and point of zero charge analysis, scanning electron microscopy and Boehm titration method. The AC was used as adsorbent for removing the metribuzin, 2,4-dichlorophenoxyacetic acid and furadan pesticides. The H₃PO₄/H₂OAC had a surface area of 1196.30 m².g^-1 and the obtained adsorption capacity was elevated for furadan (868.98 mg.g^-1), metribuzin (756.47 mg.g^-1) and 2,4-dichlorophenoxyacetic acid (274.70 mg.g^-1).

Constant temperature hot wire anemometers are widely used in measuring fluid velocity. In this work it is shown that such system can be used to measure fluid flow in the forced oscillations technique applied to the human respiratory system, in substitution to the pneumotachograph. Experimental results are shown to compare the proposed system with the original one.