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اطلاعات دوره: 
  • سال: 

    1402
  • دوره: 

    53
  • شماره: 

    3
  • صفحات: 

    192-205
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    147
  • دانلود: 

    23
چکیده: 

Brick is the most widely used construction material. Demolition of buildings and production of construction waste, including clay brick, are dramatically increasing in an alarming rate. The production of traditional bricks such as clay bricks has hazardous impacts on the environment, such as pollution and extensive use of natural resources. This study addressed the application of the geo-polymerization process as an environmental and sustainable method to produce new bricks from clay brick waste and different types of fillers. Accordingly, the powder and grains of clay brick waste, dune sand, washed sand, industrial sodium hydroxide, and water glass were utilized to prepare cubic and brick-shaped geopolymer samples with different mix designs and then cured at 70 °C. The samples' compressive strength, water absorption and SEM analysis were examined. According to the results, the highest compressive strength for cubic mortar samples was obtained in the case without filler; for these samples, with mass ratios of water glass to sodium hydroxide solution equal to 1 and 2, compressive strength was 18.45 and 22.15 MPa, respectively. In the brick samples, the highest compressive strength was obtained in the 28-day and 8 M geopolymer samples, which was equal to 25.38 MPa. On the other hand, the geopolymer samples made by sand filler had higher compressive strength and lower water absorption in comparison to other samples. Therefore, sustainable production of geopolymer bricks from clay brick waste and inexpensive materials as the filler can be a step toward mitigating the environmental impact of construction and demolition waste.

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بازدید 147

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نویسندگان: 

ZHOU H. | SMITH D.

اطلاعات دوره: 
  • سال: 

    2002
  • دوره: 

    1
  • شماره: 

    4
  • صفحات: 

    247-264
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    152
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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بازدید 152

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نویسندگان: 

نشریه: 

ENVIRON PROCES

اطلاعات دوره: 
  • سال: 

    0
  • دوره: 

    7
  • شماره: 

    4
  • صفحات: 

    1111-1127
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    118
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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بازدید 118

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اطلاعات دوره: 
  • سال: 

    2016
  • دوره: 

    2
تعامل: 
  • بازدید: 

    125
  • دانلود: 

    0
چکیده: 

IN THIS ARTICLE THE INFLUENCE OF MAJORS IN PRETREATMENT OF WASTEWATER SUCH AS AMOUNTS OF NAOH, COMPOSITION OF MIXTURE OF COAGULANTS AND MIXING RATE OF FIRST PRETREATMENT REACTOR ON THE AMOUNT OF TURBIDITY, TOTAL HARDNESS, CONTENT AND ELECTRICAL CONDUCTIVITY OF EFFLUENT WASTEWATER ARE INVESTIGATED EXPERIMENTALLY AND THE OPTIMUM VALUES ARE PRESENTED. EVENTUALLY THIS PAPER, SENSITIVITY ANALYZING SHOWS THE IMPORTANCE OF THESE FOUR MAJORS ON THE PERFORMANCE OF PRETREATMENT PROCESS.

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نویسندگان: 

DARAEI ALI

اطلاعات دوره: 
  • سال: 

    2013
  • دوره: 

    32
  • شماره: 

    2 (66)
  • صفحات: 

    67-70
تعامل: 
  • استنادات: 

    3
  • بازدید: 

    580
  • دانلود: 

    0
چکیده: 

In this study a sample of bentonite obtained from Semnan mines, was modified by a surfactant to prepare an organoclay with high surface area. BET analysis showed that the modification increased its surface significantly. The prepared sorbent was used for removal of dyes and other organic pollutants from a waste water obtained from Ekbatan textile company. Adsorption was studied in various times to obtain the saturation time. PH variation has significant effect on adsorption and led to variation of adsorbed pollutant. At pH=4.5 the pollutant concentration became minimum which showed the pH is optimum pH for adsorption. Increasing the sorbent to waste solution ratio up to 1.2 g/L also increased the sorption. Adsorption isotherm was investigated for fitting with Langmuir isotherm and it has good fitness.

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اطلاعات دوره: 
  • سال: 

    1388
  • دوره: 

    1
  • شماره: 

    2
  • صفحات: 

    31-42
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    2174
  • دانلود: 

    696
چکیده: 

یکی از مشکلات بوجود آمده برای جوامع بشری به دنبال توسعه واحدهای صنعتی مشکل آلودگی محیط زیست به ویژه، آلوده شدن منابع آب زیرزمینی تحت تاثیر فاضلاب این واحدها می باشد. فاضلاب واحدهای صنعتی به ویژه کارخانجات صنایع شیمیایی و نساجی محتوی مقادیر زیادی مواد آلی می باشد. بازیابی ترکیبات موجود در پساب امری ضروری می باشد.در این تحقیق میزان قابلیت فعال سازی کائولن به عنوان یک ماده جاذب در جذب رنگ توسط اسیدهای مختلف و همچنین تاثیر پارامترهای مختلف pH، درجه حرارت، غلظت ماده جاذب و زمان عملیات بر جذب رنگهای کاتیونیک و آنیونیک از پساب واحدهای نساجی مورد ارزیابی قرار گرفته است. آزمایشات اولیه در pH طبیعی پساب نساجی نشان داد که کائولن فعال شده با HClO4 می تواند منجر به بازیابی %96.41 از رنگهای آنیونیک و %98.36 از رنگهای کاتیونیک از پساب گردد.قابلیت جذب پساب با استفاده از کائولن فعال شده با HCLO4 در دامنه pH معادل 10، 9، 8، 7، 6، 5، 4، 3، 2 و 11 غلظتهای ماده جاذب 20، 10، 5 و 30 گرم، دمای عملیات 50، 40، 27 و 60 درجه سانتیگراد و زمان عملیات 20، 60، 40 و 80د دقیقه به منظور دستیابی به شرایط بهینه مورد آزمایش قرار گرفت. نتایج نشان می دهد که دمای عملیات و غلظت ماده جاذب در جذب رنگهای آنیونیک تاثیر چندانی نداشته و در خصوص رنگهای کاتیونیک افزایش آن منجر به افزایش جذب رنگ از پساب می گردد. ضمنا بهترین قابلیت جذب در دامنه pH معادل 2 تا 3 و زمان عملیات 60 دقیقه به دست آمده است.

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اطلاعات دوره: 
  • سال: 

    2013
  • دوره: 

    16
تعامل: 
  • بازدید: 

    128
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

FOR REUSING OF THE INDUSTRIAL WASTEWATER SHOULD DECREASE AMOUNT OF MATERIALS SUCH AS AMMONIA BECAUSE, THE AMMONIA CAN CAUSE CONNECTOR PIPES CORROSION. VARIOUS METHODS HAS BEEN USED TO REDUCE THE AMOUNT OF AMMONIA PRESENT IN THE EFFLUENTS; IN THIS PROJECT, WE WORKED ON TWO METHODS WHICH WERE BIOLOGICAL SEPARATION AND ION EXCHANGE RESINS (SORBENT SILICA-CONTAINING SOIL). IN BIOLOGICAL SEPARATION PROCESS, NEGATIVE AND GRAM POSITIVE BACTERIA THAT WAS CAPABLE TO CONSUMPTION OF AMMONIA FOR PROVIDING NEEDED NITROGEN AND ANOTHER ONE WAS ADSORBENT SILICA-CONTAINING SOIL WITH SPECIFIED MESH. WE FOLLOWED PROGRESSION OF EACH PROCESS BY SAMPLING AND MEASUREMENT OF AMMONIA THROUGH KJELDAHL PROCEDURE. THE LAST SATISFACTORY RESULTS WERE ACHIEVED BY USING ION EXCHANGE RESINS WHICH AMMONIA CONCENTRATION CAN BE REDUCED FROM 300 PPM TO 1 PPM, OF COURSE CAPACITY OF COLUMN CONTAINING ADSORBENT SILICA-CONTAINING SOIL IS LIMITED HOWEVER UTILIZATION OF THIS METHOD HASN’T BEEN LIMITED DUE TO OTHER SIDE BENEFITS ASSOCIATED WITH THIS METHOD SUCH AS MAKING CONCENTRATED COMMERCIAL AMMONIA SOLUTION; ON THE OTHER HAND THE NEXT METHOD IS ALSO PREFERABLE BECAUSE THESE BACTERIAS ARE EASILY ACCESSIBLE BUT THE LIMITING ASPECT OF THIS METHOD IS DURATION OF ITS FULFILLMENT; IN THIS STUDY APPLYING A SPECIAL SORT OF BACTERIA TOOK ABOUT 5 DAYS TO ATTENUATION THE CONCENTRATE OF AN INDUSTRIAL SPECIMEN FROM 300 PPM TO 17 PPM.

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نویسندگان: 

Almasvandi m.h. | RAHIMI M.

اطلاعات دوره: 
  • سال: 

    2017
  • دوره: 

    14
  • شماره: 

    4
  • صفحات: 

    17-31
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    249
  • دانلود: 

    0
چکیده: 

This paper reports the results of experimental removal process of ammonia from synthetically prepared ammonia solution using a microscale mixing loop air stripper. Effects of various operational parameters (such as pH, air flow rate, wastewater flow rate, and initial ammonia concentration) were evaluated. By increasing pH from 10 to 12. 25, the amount of KLa increased from 0. 26 to 0. 73 h-1. Considerable enhancement, about 150 %, can be found for KLa by changing the air flow rate from 280 to 700 mL/min under a fixed condition. The wastewater flow rate can also increase the value of KLa from 0. 22 to 0. 59 h-1. The values of KLa increased only about 20 %by changing the initial concentration of ammonia in the range between 50 and 500 mg/L. The results showed that any improvement concerning air stripping using microchannel was successfully carried out with enhancing the overall volumetric mass transfer coefficient (KLa) and providing higher mass transfer capabilities compared with other types of strippers, even for lower amounts of used air. The enhancement of mass transfer takes place by efficient mixing induced by the employed microchannel. It has been demonstrated that wastewater flow rate and air flow rate have significant effects on KLa. The optimal stripping conditions and mathematical modeling for ammonia removal and the relation between the parameters were determined using Response Surface Methodology (RSM) with Central Composite Design (CCD) method. The results demonstrate the advantages the proposed system possesses over conventional stripper types.

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اطلاعات دوره: 
  • سال: 

    1389
  • دوره: 

    1
  • شماره: 

    4
  • صفحات: 

    33-41
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    1726
  • دانلود: 

    1159
چکیده: 

هیدروکربن های سبک و سنگین، فنل و مواد آلی حل شده اگر بدون تصفیه به محیط تخلیه شود، خطر آلودگی محیط زیست را در پی خواهد داشت. برای تصفیه این فاضلاب ها ابتدا از یک بخش جدا کننده روغن و چربی و به دنبال آن، یک فرایند تصفیه بیولوژیکی برای حذف کامل مواد آلی باقیمانده استفاده می کنند.

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بازدید 1726

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نویسنده: 

TAVANA M. | ASHRAFIZADEH S.N.

اطلاعات دوره: 
  • سال: 

    2014
  • دوره: 

    3
تعامل: 
  • بازدید: 

    174
  • دانلود: 

    0
چکیده: 

A NEW WASTE HEAT AND WATER RECOVERY TECHNOLOGY BASED ON A NANOPOROUS CERAMIC MEMBRANE WATER VAPOR SEPARATION MECHANISM WAS DEVELOPED, TO EXTRACT THE WATER VAPOR AND ITS LATENT HEAT FROM LOW TEMPERATURE HIGH MOISTURE CONTENT WASTE GAS STREAMS. FOR THE WATER RECLAMATION PROCESS, WATER VAPOR CONDENSES INSIDE THE MEMBRANE PORES AND PASSES THROUGH TO THE PERMEATE SIDE WHICH IS IN DIRECT CONTACT WITH A LOW-TEMPERATURE WATER STREAM. CONTAMINANTS SUCH AS CO2, O2, NOX, AND SO2 ARE INHIBITED FROM PASSING THROUGH THE MEMBRANE BY ITS HIGH SELECTIVITY. THE RECOVERED WATER IS OF HIGH QUALITY AND MINERAL FREE, THEREFORE CAN BE USED AS SUPPLEMENTAL MAKEUP WATER FOR ALMOST ALL INDUSTRIAL PROCESSES. THE MEMBRANE BASED TECHNOLOGY HAS BEEN FIRST DEVELOPED AND DEMONSTRATED FOR INDUSTRIAL BOILER FLUE GAS HEAT AND WATER RECOVERY. NOW IT IS BEING DEVELOPED FOR WIDER APPLICATIONS, FROM RESIDENTIAL HUMIDIFICATION, COMMERCIAL LAUNDRY, BIOMASS PRODUCTION TO UTILITY BOILERS. THE INCREASED APPLICATION AREAS WILL GREATLY ENHANCE WASTE HEAT AND WATER RECOVERY POTENTIALS WORLDWIDE, TO SAVE BOTH ENERGY AND WATER, AND BENEFIT THE GLOBAL ENVIRONMENT. IN THIS PAPER, THE TECHNOLOGY DEVELOPMENT PROCESS, AND SEVERAL DEMONSTRATIONS FOR DIFFERENT APPLICATIONS ARE DISCUSSED IN DETAILS.

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