List of Articles Pumice

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  1 - Feasibility study of nitrate surface absorption by mineral pumice from Nitrate solution on a laboratory scale
  Farzad Bakhshandegan Moghaddam Parisa Hoseini
  The surge in population and imprudent consumption of water resources have created many challenges in securing sufficient water for sustaining human life. To supply part of the water demand for agriculture, the reuse of gray water is recommended. However, many decontamin More

  The surge in population and imprudent consumption of water resources have created many challenges in securing sufficient water for sustaining human life. To supply part of the water demand for agriculture, the reuse of gray water is recommended. However, many decontamination methods are cost-prohibitive and pose challenges in sludge disposal after purification. The purpose of this research is to evaluate the feasibility of nitrate absorption by a mineral pumice adsorbent from nitrate solutions. The present study was conducted as a two-factor factorial experiment and complete randomized design with three replications. The study involved sampling mineral pumice with diameters of 1 cm, and 5 cm and gradation ranging from 1 to 5 cm over 45 days. The samples were calibrated by spectrophotometric method at a wavelength of 470 nm. Results showed that mineral pumice influenced nitrate absorption from the solution. The amount of nitrate in the control treatment was 0.88 grams per liter on the first day. The highest absorption occurred on the 20th day for the 1 cm soil gradation, resulting in a decrease to 0.62 grams per liter, which indicated 0.36 grams per liter of nitrate absorption. Larger gradations, however, showed the highest absorption on the 30th day. The 5 cm treatments and 1-5 cm gradation showed a reduction (absorption) of 0.19 and 0.27 grams per liter of nitrate, respectively, compared to the control treatment. According to the results, mineral pumice, an economical resource, can be used to absorb nitrate from nitrate solutions. Moreover, the used mineral pumice could find applications as a soil texture modifier or fertilizer in various fields beyond nitrate absorption. Manuscript profile
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  2 - Comparison of pyroclastic units (pumice & lahar) in mallar and reyneh valleys at Damavand volcano
  Amirhoushang Shirazi Manuchehr Farajzadeh
  Main objective of this research is comparison between pyroclastic of Malar and Raynah valleys in Yakhar basin in south-east of  Damavand volcano. studing of pyroclastic is very important in recognition of Dmavand volcano.this research is based on descriptive &ndash More

  Main objective of this research is comparison between pyroclastic of Malar and Raynah valleys in Yakhar basin in south-east of  Damavand volcano. studing of pyroclastic is very important in recognition of Dmavand volcano.this research is based on descriptive – analytical and using Rayneh Topographic map and Geological map of Damavand, G.P.S AND G.I.S Software.A characteristic of the Reyneh deposite is that clasts below 10 cm are mostly light grey and vescular when broken open, while most larger clasts are dark grey to black.Mallar deposite is whiter than Ryneh pumice most of mallar pumices are fall but most of reyenah pumices are flow. .volume of lahar is more in reyenah. Manuscript profile
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  3 - Effect of mineral superabsorbent on some characteristics of soil and growth parameters of onion (Allium cepa) under limited irrigation
  Elnaz Sabbagh Tazeh Nasrin Sadeghian Younes Rameshknia
  Nowadays, using superabsorbent polymers such as pumice is one of practical approaches to increasing water storage in soil and increasing irrigation efficiency. To  investigate the effects of pumice on chemical and physical characteristics of soil, growth parameters More

  Nowadays, using superabsorbent polymers such as pumice is one of practical approaches to increasing water storage in soil and increasing irrigation efficiency. To  investigate the effects of pumice on chemical and physical characteristics of soil, growth parameters and irrigation schedule of onion, an experiment in CRD design as factorial with three factors including: 1) soil type (with two raters: a) sandy loam  and b) clay loam, 2) irrigation schedule (with two rates: a) 7 and b) 4 days) and 3) pumice (with four  rates: 0, 2.5, 5 and 7.5 percentage by weight) and three replications was conducted. Results showed that increasing pumice rate could increase bulb dry matter, bulb diameter and bulb height. Pumice also could increase seales number in bulb, p and K concentration in plant and also available P and K concentration and CEC in soil. Pumice application in both soils, increased soil salinity, but in none of soils, soil EC was not more than 5 dS/m. Pumice application in both soils could decrease soil pH and compaction significantly. There was no significant difference between 5% and 7.5% of pumice rates, in bulb dry matter in sandy loam, height and diameter of bulb in clay loam, P and K concentration of onion and soil, CEC, compaction, salinity in sandy loam and drainage salinity. Between irrigation rates was no significant difference in none of properties, in treatments that received pumice. It can be concluded that using 5% pumice in soil, we can increase irrigation schedule of onion from 4 to 7 days. Manuscript profile
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  4 - The Effect of Pumice on Irrigation Schedule and Nutritional Quality of Onion in two Types of Soil Texture under Deficit Irrigation
  elnaz sabbagh tazeh Nasrin Sadeghian
  10.22034/jest.2020.35860.4267
  Background and Objective: Due to scarcity of water in most regions of Iran, the use of superabsorbent polymers is known as a helpful approach in improving soil physical and chemical properties, soil fertility and water resources storage. The purpose of this study was to More

  Background and Objective: Due to scarcity of water in most regions of Iran, the use of superabsorbent polymers is known as a helpful approach in improving soil physical and chemical properties, soil fertility and water resources storage. The purpose of this study was to examine the effect of pumice on water availability, chemical and nutritional properties in a course and fine textured soils under onion cultivation. Method: This research, was conducted in spring of 2017 in greenhouse as factorial in form of CRD design with three factors including soil texture (with two levels: sandy loam and clay loam), irrigation schedule (with two levels: every 4 and every 7 days) and pumice (with four levels: 0 (C1), 2.5 (C2), 5 (C3) and 7.5 (C4) percentage w/w) which were carried out in three replications. Findings: Results, showed that increasing pumice rate, could increase P, K, S, Fe, Mn and Zn concentration in onion. In most cases, there was no significant difference between 5 and 7.5 percentages of pumice rates. Positive effect of pumice in sandy loam soil was more than clay loam. In pumice treatments, there was no significant difference between two irrigation rates, for none of parameters except for Cu concentration in plant. Discussion and Conclusion: By Application of 5 percentage w/w pumice in soil, irrigation schedule of onion could be increased from 4 days to 7 days. Noting that the irrigation schedule is one of the most important factors in onion cultivation, pumice application, can cause a good economic efficiency in water use. Manuscript profile
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  5 - The efficiency of combined process of electrocoagulation with iron electrodes and a filter columns containing pumice in removing chromium and cyanide from the wastewater of Safa Dasht industrial estate
  Seyed mohsen Beladi roya mafigholami mehrad m,ehrdadian
  Background and Objectives: Nowadays, environmental preservation is considered a necessary matter for society. Industrial wastewater treatment requires various effective processes, due to their unique physicochemical characteristics. The quality and quantity of industria More

  Background and Objectives: Nowadays, environmental preservation is considered a necessary matter for society. Industrial wastewater treatment requires various effective processes, due to their unique physicochemical characteristics. The quality and quantity of industrial wastewater are more complicated than human wastewater due to the presence of various industries and must be treated before being discharged into the environment due to their high pollution load. One of the common pollutants in industrial wastewater is heavy metals. The electrocoagulation and filtration process, as an environmentally friendly and integrated process, have a high capability in treating wastewater with high levels of pollution. Material and Methodology: In this study, the electrocoagulation process was used on a laboratory scale to remove chromium (hexavalent) and cyanide metal pollutants. In this process, the effect of various parameters, including the initial pH of the wastewater (5-9), reaction time (0-60 minutes), applied electric current (1-3 Amps), and filtration bed height (10-30 cm) were investigated. Findings: Based on the obtained results, the best conditions for the electrocoagulation process include a pH of 7, a reaction time of 60 minutes, an applied electric current of 3 Amps, and a filter bed height of 30 cm. Under these optimal conditions, the removal efficiency of chromium and cyanide was 92% and 88%, respectively. In this way, in the determined optimal conditions, the concentration of chromium and cyanide decreased from 13 and 0.908 mg/L to 1.56 and 0.72 mg/L, respectively. Discussion and Conclusion: Based on the standards provided by Iran's Environmental Protection Organization, treated wastewater has the ability to be discharged into the environment. Manuscript profile
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  6 - Investigation of mechanical and durability properties of lightweight concrete containing Pumice
  Amirmohammad Soleimani Seyed Amir Hossein Hashemi
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  7 - Performance of Porous Concrete Containing Additive in Reduction of Urban Runoff
  Ehsan Teymouri s.farhad musavi hojjat karami saeid farzin
  One of the cases of human intervention in environment is vast variations in making parts of the land surface impervious, followed by changes in the hydrologic cycle. Porous concrete is an especial type of highly pervious concrete, compatible with the environment, and co More

  One of the cases of human intervention in environment is vast variations in making parts of the land surface impervious, followed by changes in the hydrologic cycle. Porous concrete is an especial type of highly pervious concrete, compatible with the environment, and could be used a method to increase surface infiltrate and reduce urban runoff. In the present experimental research, to improve the performance of this type of concrete, effect of adding lightweight pumice and perlite (0.6-1.2 mm), and adding 10% fine grains to the samples, was investigated. In this respect, the effective parameters for using porous concrete in urban runoff system, such as compression strength, hydraulic conductivity and porosity of the samples were measured. Analysis of experimental results was performed by using SAS 9.4 software at 95% confidence level. Results showed that adding fine grains to porous concrete increases compression strength and reduces hydraulic conductivity and porosity. Addition of lightweight pumice increases compression strength and reduces hydraulic conductivity and porosity of porous concrete. But, lightweight perlite reduced all three parameters of hydraulic conductivity, porosity and compression strength. In general, lightweight pumice, which has higher density and more pore space in its structure with respect to perlite, had better performance. Manuscript profile
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  8 - معرفی‌ بسترکشت مناسب‌ جهت رشد بهینه گیاه‌ زینتی‌ کراسولا
  حسین کیانی نازنین خاکی پور سپیده کلاته جاری سکینه سعیدی سر
  خصوصیات‌ مواد مختلف‌ مورد استفاده‌ به‌ عنوان‌ بستر کاشت‌، آثار مستقیم‌ و غیرمستقیم‌ بر رشد و تولید محصول‌ می‌گذارد و انتخاب‌ بستر مناسب‌ یکی‌ از مهم‌ترین‌ عوامل‌ موثر در موفقیت‌ تولید در کشت‌ بدون‌ خاک‌ است‌. تحقیق‌ حاضر با هدف‌ بررسی‌ اثر خصوصیات‌ فیزیکی‌ و شیمیایی‌ بس More

  خصوصیات‌ مواد مختلف‌ مورد استفاده‌ به‌ عنوان‌ بستر کاشت‌، آثار مستقیم‌ و غیرمستقیم‌ بر رشد و تولید محصول‌ می‌گذارد و انتخاب‌ بستر مناسب‌ یکی‌ از مهم‌ترین‌ عوامل‌ موثر در موفقیت‌ تولید در کشت‌ بدون‌ خاک‌ است‌. تحقیق‌ حاضر با هدف‌ بررسی‌ اثر خصوصیات‌ فیزیکی‌ و شیمیایی‌ بسترهای مختلف‌ کشت‌ بر رشد و نمو کراسولا انجام‌ شد. به‌ همین‌ منظور بسترهای کشت‌ آلی‌ و معدنی‌ مختلف‌ از جمله‌ شن‌، کوکوپیت‌، زغال‌ چوب‌، پومیس‌، پیت‌ماس‌ و زئولیت‌ با نسبت‌های مختلف‌ ترکیب‌ شدند و مورد آزمایش‌ قرار گرفتند. صفات‌ ترکیبات‌ فیتوشیمیایی‌ (کلروفیل‌ a، b و کل‌، کاروتنوئید، میزان‌ فعالیت‌ آنزیم‌های SOD و (MDA، وزن‌ تر و خشک‌ ریشه‌ و اندام‌ هوایی‌، جذب‌ عناصر (نیتروژن‌، فسفر و پتاسیم‌) در گیاه‌ کراسولا آتشین‌ ارزیابی‌ شد. بر اساس‌ نتایج‌ پژوهش‌ حاضر، بین‌ بسترهای مختلف‌ کشت‌ از نظر ارتفاع‌ گیاه‌، وزن‌ تر و خشک‌، میزان‌ جذب‌ عناصر غذایی‌ و فعالیت‌ آنزیم‌ها اختلاف‌ معنی‌داری وجود داشت‌. گیاهان‌ کراسولا رشد یافته‌ در بستر ١٠ (٣٥ سی‌سی‌ پومیس‌ ریز + ٥ سی‌سی‌ کوکوپیت‌ + ٥ سی‌سی‌ پیت‌ ماس‌ + ٥ سی‌سی‌ زغال‌) و بستر ١ (٣٥ سی‌سی‌ شن‌ ریز ٣-٥ میلی‌متر + ٥ سی‌سی‌ کوکوپیت‌ + ٥ سی‌سی‌ زغال‌) نیز به‌ ترتیب‌ بیشترین‌ و کمترین‌ مقادیر عددی صفات‌ ذکر شده‌ را نشان‌ دادند. به‌ نظر می‌رسد که‌ به‌ کارگیری ترکیباتی‌ با خصوصیات‌ پومیس‌ و کوکوپیت‌ و زئولیت‌ها از طریق‌ جلوگیری از هدر رفتن‌ عناصر غذایی‌ و نگهداری یون‌های مغذی باعث‌ افزایش‌ کارایی‌ کودها و بهبود جذب‌ عناصر غذایی‌ و حفظ‌ رطوبت‌ شده‌ و در نهایت‌ موجب‌ افزایش‌ و بهبود رشد گیاه‌ شد. Manuscript profile
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  9 - Investigation of the Pumice Additive Effect in Azarshahr Region on Mechanical Properties and Self-compacting Concrete Performance
  Farhad Pirmohammadi Alishah Ayub Khandaghi Mehdi Mohammadrezaei Sattar Shafiei
  10.30495/geotech.2022.692951
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  10 - Investigation of the pumice mineral adsorbent silanization for oil/water separation
  Parveneh Raeisi Reza Norouzbeigi Hadi Shayesteh
  10.30495/jacr.2022.689198
  Providing acceptable and cost-effective environmental biomaterials that can remove the oily phase from the water is necessary. The aim of the present study was to prepare pumice, an oil adsorbent, and performance evaluation of the mineral material in oil/water separatio More

  Providing acceptable and cost-effective environmental biomaterials that can remove the oily phase from the water is necessary. The aim of the present study was to prepare pumice, an oil adsorbent, and performance evaluation of the mineral material in oil/water separation. By applying one factor at a time method, the effect of the modifier type (octadecyl trichlorosilane and trimethylchlorosilane) and the modifier concentration (within a specific range) were evaluated for the pumice. The optimum water contact angle of pumice was obtained 159.2°±0.82°. Instrumental characterizations were performed to determine the properties of the adsorbents. Also, the presence of modifiers on the surface of the pumice was confirmed. The removal efficiency and flow rate of dichloromethane from water using pumice were 98.3% and 8422.38 Lm-2 h-1, respectively. Also, separation efficiency experimental in ten cycles was performed, and the separation efficiency was still above 92% after ten cycles of oil/water separation. On the other hand, with increasing separation cycles, the flux decreased from 8422.38 to 3445.52 Lm-2 h-1. The variation of water contact angle values vs. water immersion time was evaluated to examine the particles' durability. After 6 h, water contact angle decreased from 159.2° to 153.3°. Manuscript profile