A biological assessment of the Tang Sorkh River (Iran) was studied from July 2013 to August 2014 using benthic macroinvertebrate communities. Samples were gathered every two months, from five stations using a Surber sampler( 30×30cm), fixed in formalin (4%) and then separated and identified in the laboratory. Environmental conditions (current velocity, temperature, depth, width, dissolve oxygen...

When used at high temperature in air, titanium-based alloys form an oxide scale their surface but also dissolve large amount of oxygen metallic matrix and this is a cause embrittlement. Nitrogen secondary oxidant, which dissolves embrittles the alloy. Oxidation experiments Ti-6Al-2Sn-4Zr-2Mo-0.1Si alloy, for 1000 h 650 °C synthetic air (N2-20%O2) mixture Ar-20%O2, showed that nitrogen decreases...

A nontoxic cellulose solvent and process for forming and utilizing the same. The solvent includes a metal chelating agent, a metal compound, an oxygen scaveng ing stabilizing agent and a caustic swelling agent with the disclosed solvent being prepared in either aqueous or solid form. The solvent is caused to contact cellulosic materials in order to dissolve cellulose therefrom. The dissolved ce...

The rotating biological contactor is an attached growth biological treatment used in removal of biodegradable matter present in wastewater is popular due to its simplicity low energy requirement, low land requirement, stable in various shock loading and recirculation not required and low hydraulic retention time. This review paper focuses on various controlling parameter of RBC like organic loa...

In this paper we elaborate on the idea @Lohse et al., Phys. Rev. Lett. 78, 1359–1362 ~1997!# that ~single! sonoluminescing air bubbles rectify argon. The reason for the rectification is that nitrogen and oxygen dissociate and their reaction products dissolve in water. We give further experimental and theoretical evidence and extend the theory to other gas mixtures. We show that in the absence o...

This study was designed to determine the interrelationship between physico-chemical parameters and plankton community in three different aquaculture systems (wishpond, wishpond aquaponics traditional fish pond). The water quality parameters, dissolve oxygen (DO), temperature, pH, ammonia, alkalinity transparency were monitored found within recommended range. Different phytoplankton of four (4) ...

enzymatic extract preparation from pseudomonas aeruginosa km110 under accession no. hq730879 with lipase activity (0.3 u/ml), was used to perform enzymatic hydrolysis pretreatment of a synthetic dairy wastewater with 1000 mg/l total fat content. the pretreatment was optimized for 48 h hydrolysis time, at 45æ% c with 10% v/v enzymatic extract. the biological treatment of synthetic dairy wastewa...

Introduction The possibilities of using liquid instead of air in the exchange of gases have always fascinated researchers. The first studied liquid was saline solution which appeared to be unsuitable for transporting gases in normobaria. Its capacity to dissolve oxygen is low, and its viscosity and density are high as compared with air. Moreover, the introduction of saline into the lung can rem...