نتایج جستجو برای: organic system
تعداد نتایج: 2407474 فیلتر نتایج به سال:
in this study, feasibility of upgrading and retrofitting municipal wastewater treatment plantswas investigated at laboratory scale using moving bed biofilm reactor (mbbr) process. for this purpose,an aerobic pilot was operated for nearly one year in different conditions, in which a moving bed carrier with aspecific biofilm surface area of 500 m2/m3 and a filling rate of 60% was utilized. system...
in recent years, in order to enhance the health of agroecosystems, concerns on ecological inputs especially to produce medicinal plants, has been increased. in order to evaluate the effects of winter cover crops on pgprs activities and soil nitrogen content in simultaneous application of organic manures and biological fertilizer in a low input production system of cucurbita pepo under minimum t...
We managed to create a self-developed sensor system, which is based on the simultaneous reflectance measurements at 660 and 940 nm wavelength. The ratio of refers concentration soil organic carbon (SOC). This instrument has calibration range 1.19 6.05 SOC%. SOC content twenty-six samples was measured by system standard spectrophotometric method we found that estimation in had good approximation...
Background & Objectives: Polycyclic aromatic hydrocarbons (PAHs) are considered as important organic contaminants due to their high toxicity and carcinogenic properties. Among PAHs, phenanthrene is found in most contaminated sites. Sorption and desorption of phenanthrene in soil affect the fate of the contaminant in soil-water system. Presence of organic matter (OM) in the soil matrix can also ...
Nowadays, thousands tons of chemicals material are used to increase agricultural production that provides a risky situation for the communities. Recently, biological or organic agriculture is considered to get rid of such problems. But this style of agriculture is facing with many difficulties and challenges. This study was performed in three phases by using Delphi method. In this regard, the s...
Background : Kinetic models in natural wastewater treatment systems design can have an important role to help designing other parts from aspects of physical, hydraulic and process in real scale, and to determine the strengths and weaknesses of system. So, the initial aim of wetlands design is removal of organic matter is , BOD5 and COD, so. Determining the kinetic coefficients is necessary. ...
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