نتایج جستجو برای: and removal
تعداد نتایج: 16849197 فیلتر نتایج به سال:
Background: There are great resources of natural zeolite in Iran. Zeolite, an inorganic ion-exchanger, may be used as a suitable technical-economical solution for water treatment in many regions of Iran. In this study, the characterization of natural zeolite natrolite and the feasibility of removing hardness, cations, and anions were investigated. Methods: First, zeolite composition and type...
Background and Objectives: Soil pollution by oil compounds is a serious environmental and ground water problem throughout the world. Total petroleum hydrocarbons (TPH) are a combination of many distinctive compounds. Some of these compounds in exposure with human and animal can cause cancer, disorder central nervous system, liver and lungs affects. The objective of this research was to investig...
Background and purpose: Intrauterine device (IUD) is one of the modern methods of contraception one of the problems in using this method is its early removal. This study aimed to determine one-year survival rate and discontinuation causes of IUD use in Kermanshah, Iran. Materials and methods: In this cohort study, data were collected from patients with IUD using a questionnaire containing demo...
Background and aims: In this study the effectivness application of conventional apartment ornomental flowers to survay removal capability of five kind of pollutant: aromatic hydrocarbons (Benzene and Toluene), aliphatic hydrocarbons (Octane), halogenated hydrocarbons (Trichloroethylene (TCE)) and tropens (Alpha-Pinene) in indoor ambients was studied. Methods: At the first, 10 species of orno...
introduction cadmium as one of the toxic heavy metal, because of harmful effects on health and the environment, has attracted a lot of attention. the main sources of cadmium emissions are the environment, the waste of electroplating, melting, alloyed manufacturing, pigments, plastics, batteries, extraction and refining processes. this metal easily accumulates in different machines of people...
background: wastewater produced by a dairy in sanandaj is a major source of environmental pollution threatening the city. the dairy uses activated sludge treatment to remove organic pollution from the wastewater. the present study evaluated the performance of this process and its compliance with national requirements for chemical oxygen demand (cod), biochemical oxygen demand (bod), and total s...
In this research modified Kaolin by Cetyltrimethylammonium bromide is used as an adsorbent for the removal of Reactive Blue 21 from aqueous solutions. Response Surface Methodology was used to study the effect of independent variables, such as Reactive Blue 21 dye concentration (20, 40, 60, 80 and 100 mg/L), time (10, 20, 30, 40 and 50), initial pH (2, 4, 6, 8 and 10) and modified Kaolin dosage ...
Background and purpose: Cyanide (CN-) is of dangerous pollutants in the environment from industries such as electroplating, mining and paint entering into environment. The present study aimed to review the efficiency of cyanide removal by zirconia photocatalytic process with and without hydrogen peroxide (H2O2). Materials and methods: This was an applied-fundamental study and was conducted in ...
background: natural organic matter is the cause of many problems associated with water treatment such as the presence of disinfection by-products (dbps) and membrane fouling during water filtration. in this study, the performance of the peroxi-electrocoagulation process (pep) was investigated for the removal of humic acids (has) from aqueous solutions. methods: pep was carried out for the remov...
Background and Objectives: Chest tube removal is a prompt painful procedure. The pain is gradually relieved after removal of the tube. Cold application in combination with the Indomethacin suppository administration may increase the duration for analgesic need. This study aimed to evaluate the effect of cold in combination with Indomethacin suppository on the duration for analgesic need after c...
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