7 research outputs found
POST-TREATMENT OF LEACHATE BY MICROWAVE-FENTON PROCESS USING OFAT ANALYSIS METHOD
Industrial and economic development along with changes in lifestyle over recent
decades in most countries has resulted in considerable growth of different
waste. Since biodegradable organic materials constitute approximately 60\% of
the total municipal solid waste in developing countries, leachate treatment is
considered as a big concern for solid waste management in these areas.
Application of biological processes is one of common method in leachate
treatment. However, due to presence of refractory pollutants, biological process alone cannot treat leachate on its own. In order to enhance the quality of leachate to the discharge standards, post treatment of biologically treated leachate is essential. One appropriate solution for complementary treatment of leachate and removal of refractory materials is the application of advanced oxidation rocesses. The Fenton process is one of homogenous advanced oxidation processes has been applied for leachate treatment. However, this method is time-consuming and expensive. In order to improve the performance and reagent utilization efficiency, in this paper microwave enhanced Fenton process was utilized for post-treatment of composting leachate. Batch laboratory scaled experiments were employed on effluent of leachate treatment plant of a composting factory in Iran. Initial experiments were conducted and then the effects of variables were determined separately by one factor at a time (OFAT) method. The effects of factors such as pH, ratio of concentration of to initial COD, ratio of concentration of to , and Microwave irradiation power on the microwave enhanced Fenton process efficiency were investigated. According to obtained results the maximum removal efficiency of Microwave enhanced Fenton process was obtained at pH=3, ratio of H2O2 concentration to initial COD equals to 3.75, ratio of concentration to concentration of 3, and Microwave irradiation power of 170W. The experimental results indicated that, under this optimum conditions, the removal of COD, total nitrogen, color, and turbidity were 72\%, 70\%, 75\% and 88\% respectively. Results of this research addresses that, applied process is unable to reduce organic load of the leachate in a way that it could be discharge in receiving environment. However, the ratio of was elevated from 0.01 to 0.25, representing substantial improvement in biodegradability. By so doing, a common biological process such as activated sludge could be hopefully utilized to reduce remaining organic load to the limits set by the standard
Traditional uses, chemistry and pharmacology of Ruscus genus (“Murd esfarm” in traditional Persian medicine); a review
Background and objectives: Ruscus genus from Asparagaceae (popularly called Butcher`s broom) are perennial rhizomatous evergreen herbs and grows in Europe and south western Asia. They are generally used as anti-inflammatory, diaphoretic, diuretic, mildly laxative, and vasoconstrictive agents in many countries. Ruscus hyrcanus Woronov is widely distributed in north of Iran. It is known as “Murd esfarm” in Persian traditional medicine (TPM). Based on TPM, Iranian physicions applied “Murd esfarm” for various disorders such as epilepsy, diarrhea, expulsion of intestinal worms and for increasing milk secretion. This study aimed to identify “Murd esfarm” a drug used in TPM and develop its therapeutic aspects and introduce a novel species for treatment of chronic vein disease. Methods: This study was conducted using the electronic databases (e.g., Pubmed, Web of science) and important Iranian traditional medicine books such as the Canon of medicine, Makhzan-ol advie, Tuhfat al-Mu’minin. Results: Extracts of these plants were effective in increasing venous tone because of their anti-inflammatory and astringent properties, which is attributed to saponin glycosides. Ruscogenin and neoruscogenin are compounds that constrict and strengthen veins and promote circulation from the lower extremities in both species. Conclusion: R. hyrcanus is a unique species of Ruscus in Iran.Due to the similarity of the Butcher`s broom with the plant mentioned in TPM books, this species can be used for the treatment of many diseases related to vascular insufficiency, including varicose veins and hemorrhoids