In the free water surface flow (FW-SF) constructed wetlands, a large number of micro organisms that live around the roots of plants create a suitable environment for wastewater treatment. To study the effect of Vetiver plant and sewage retention time in treatment effici More
In the free water surface flow (FW-SF) constructed wetlands, a large number of micro organisms that live around the roots of plants create a suitable environment for wastewater treatment. To study the effect of Vetiver plant and sewage retention time in treatment efficiency of such systems, nine ponds in the Karoun sugarcane Agro-industrial located in the city of Shushtar was built. Units, in parallel with each other and each unit with length 3m, width 1m and height 0.8 meters. Continuously, agricultural wastewater from the washing process of sugarcane from December 2013 until May 2014 was established. Three of the units filled with soil and were transplanted with vetiver (S), three units were cultivated with vetiver on the floating platform (F) and three units were kept unplanted as control (C). The average BOD5 concentration of the wastewater entering the unit was 115±15.69 mg/l and retention times of experiments were 3, 5 and 7 days. During the experiment, the concentration of BOD5 per unit of input and output measurements was analyzed using SAS software. The results of the analysis showed significant differences between plant and non-plant systems, including retention times. The constructed wetland system with plant cultivated and the retention time of 7 days in May had highest value of the average removal rate equal to 68.48 percent. In other words, optimum conditions for maximum BOD5 removal rate of Karoun sugarcane Agro-industrial wastewater in floating constructed wetlands systems was with vetiver cultivated and in the retention time of 7 days.
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In this research, the quality of water of Band Ali khan wetland, phytoplankton, zooplankton and also some factors such as BOD5, COD, DO were measured seasonally during the year 2005-2006. Results showed in this wetland 3 groups of fresh water phytoplanktons were recogni More
In this research, the quality of water of Band Ali khan wetland, phytoplankton, zooplankton and also some factors such as BOD5, COD, DO were measured seasonally during the year 2005-2006. Results showed in this wetland 3 groups of fresh water phytoplanktons were recognized which were included Bacillariophyceae with 11 genus, Cyanophyceae with 3 genus, Euglenophyceae with one genus. Navicula had the biggest plenty and Euglena had the least. Also 4 genus of zooplankton including Crustacea with two genuses, Rotifer and Cilliata with one genus were recognized. The biggest plenty of zooplankton belonged to Vorticella and the least was Daphnia. The results showed that concentration of water pollutant has reduced significantly in outlet of wetland. Decreasing of concentration of pollutant was 92 % for BOD5 and 94 % for COD. Also the concentration level of dissolved oxygen increased up to 85% in the end part of wetland compared to the entrance of it. Concentration of planktons in the end part of the wetland showed increment compared to the entrance.
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استفاده از خودپالایی رودخانه­ ها برای بهبود کیفیت آب اقتصادی ­ترین و پایدارترین راه برای آب پاک است. در مطالعه حاضر، مدل QUAL2Kw برای بررسی کیفیت آب و ظرفیت خودپالایی در رودخانه کوهستانی سالند استفاده شده است. هدف این مطالعه بررسی کیفیت آب رودخانه ­ی سالند د More
استفاده از خودپالایی رودخانه­ ها برای بهبود کیفیت آب اقتصادی ­ترین و پایدارترین راه برای آب پاک است. در مطالعه حاضر، مدل QUAL2Kw برای بررسی کیفیت آب و ظرفیت خودپالایی در رودخانه کوهستانی سالند استفاده شده است. هدف این مطالعه بررسی کیفیت آب رودخانه ­ی سالند در رابطه با مصارف آشامیدنی و کشاورزی است. پارامترهای کیفی BOD5، کلیفرم کل و فسفات در دو ماه دی 1398 و مرداد 1399 شبیه ­سازی و با داده­ های میدانی مقایسه شدند. نتایج حاصل از مدل تا حدود زیادی گویای شرایط واقعی رودخانه می ­باشد که این امر نشان دهنده توانا بودن مدل QUAL2Kw در شبیه ­سازی پارامترهای کیفی است. با توجه به نتایج مشاهداتی، پارامترهای فسفات و کلیفرم­ کل از لحاظ کاربری کشاورزی همچنین پارامترهای BOD5 در بازه مورد مطالعه عامل تهدید کننده ­­ای برای حیات آبزیان محسوب نمی ­باشد. از لحاظ کاربری شرب بر اساس استاندارد اتحادیه اروپا، سازمان محیط­زیست آمریکا وطبقه ­بندی آب­های سطحی ملی پاکستان، پارامترهای BOD5 و کلیفرم کل طی دوره نمونه­ برداری، این استاندارد رعایت شده است. سرعت جریان رودخانه تأثیر بیشتری در خودپالایی آب رودخانه ­های کوهستانی دارد و محل آلودگی منبع نقطه ­ای تأثیر بسیار محدودی دارد. با توجه به نتایج دو پارامتر RMSE و CV مدل بهترین انطباق را به ­ترتیب برای پارامترهای BOD5، فسفات و کلیفرم کل داشته است.
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Content and procedures: Through an analytical study, twelve samples from the sewage water of Mobarake Steel Company taken 1392 have been studied and the level of pollutants in them identified and analyzed. The treatment method and technology used for these samples has a More
Content and procedures: Through an analytical study, twelve samples from the sewage water of Mobarake Steel Company taken 1392 have been studied and the level of pollutants in them identified and analyzed. The treatment method and technology used for these samples has also been studied and based on the study a new process with more prevalent technology (BAT) has been recommended. The findings and analyzed using the SPSS software and the pollutant levels compared to the allowed standards. Findings and results: According to the results of the BOD­­­5­ testing and the temperature of the twelve comparison, the levels of manganese and phosphate contain the highest amounts of controlled substances, in particular in one third of the samples (4 out of the 12) the level of these two substances was higher than the permitted level. Also the nitrite and iron levels in one fourth of the samples (3 out of 12) were higher than the permitted level. The levels of the BOD, pH and TDS in one sixth of the samples (2 out of 12) were also higher than the permitted level. Given the scarcity of water in Esfahan and the agriculture fields in close vicinity of Esfahan’s Steel Company, the use of the sewage water from the steel industry is unavoidable and considering the number of samples with higher than standard levels of unpermitted substances, the use of the exit sewage water for agricultural purposes with the current standards should not be permitted and it is necessary to upgrade the treatment facilities of this company.
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