-
Open Access Article
1 - Environmental and Sanitary Risk Assessment of the waste water treatment plant in west of Ahwaz Using AHP and TOPSIS methods
hamidreza pourkhabbaz azin azizi saeide javanmardi Ali Reza PourkhabbazBackground and Objective: Employed workers in wastewater treatment plants are always exposed to threats of risk factors in the workplace such as harmful physical, chemical and biological factors. Therefore, the present study assesses the safety, health and environmental MoreBackground and Objective: Employed workers in wastewater treatment plants are always exposed to threats of risk factors in the workplace such as harmful physical, chemical and biological factors. Therefore, the present study assesses the safety, health and environmental risks in the wastewater treatment plant in west of Ahwaz city to investigate these risks and provide the necessary solutions. Material and Methodology: After the field visits, interviews to experts and staffs of treatment plant and internet researches (2018), a list of the most important risks was identified and given to the experts and staffs. In order to analyze and prioritize the risks, it was used from AHP and TOPSIS, which are multi-criteria decision-making methods (MCDM) and as well as the entropy technique to calculate the weight of the indicators. In Continuation to prioritizing strategies of factors, in order to removing the conflict between TOPSIS and AHP results, it was used the ranks mean.Findings: According to the results of AHP and TOPSIS, the most important safety and environmental risks that were identified, are impact to rotating parts of systems, entry of toxic materials and impermissible industrial wastewater and the dispersion of biogas from sludge digestion reservoirs. Also, according to the results of the ranks mean method, among the safety and health risks, it was Assigned impact to rotating parts of systems to score 1/5 the first priority, the electric shock and the dispersion of bad gas from wastewater to score of 3 and 3/5 were the second and third priority respectively. Among the environmental risks, it was Assigned entry of toxic materials and impermissible industrial waste water, the dispersion of biogas from sludge digestion reservoirs to score of 2 first priority, fire and explosion score of 3 second priority and fluctuations of waste wate discharge score of 3/5 the third priority.Disscotion & Conclusion: Given that the performance of wastewater treatment plants is a function of various human, natural, equipment and functional factors at the exploitation stage, therefore, management of these factors will help to improve the process of exploitation. In the present study, one of the most important management actions to reduce the level of risks identified, can pointed to apply of work safety guidelines, establishing of facilities and necessary equipment to burn additional gases and prevent their dangerous accumulation in the treatment plant environment, perform pre- treatment of industrial wastewater and continuous monitoring of effluent wastes to match with environmental standards. Manuscript profile -
Open Access Article
2 - Study of the Environmental Effects of Wastewater Treatment Plant of Yazd using the ENTROPY Method
Farshid Saee Sahar Rezaian Razieh RahimiBackground and Objective: This research studies the environmental factors that may be influenced, considering the nature of the project and the way the various stages of utilization exert their influence, and the environmental resources that may be affected by the execu MoreBackground and Objective: This research studies the environmental factors that may be influenced, considering the nature of the project and the way the various stages of utilization exert their influence, and the environmental resources that may be affected by the execution of the different stages of the project. Environmental influences are various changes caused by different activities in the physical, chemical, biological, cultural, economic, and social environments, with each project having different temporal and spatial effects. That is, the consequences and effects resulting from the different stages of construction, utilization, and post-utilization of projects are different.Material and Methodology: The environmental factors considered to study the environmental effects of the wastewater treatment plant in Yazd included the physico-chemical, biological, economic, and social environments. In each of the cases mentioned above, many different parameters are selected, depending on the features of the project, to serve as indices. These indices are used as criteria for comparison of options. In environmental studies of projects, the types of effects are differentiated and employed in environmental analyses. Findings: Considering the decision-making matrix, which included 10 options, and the results obtained from the ENTROPY method, the experts selected the main indices that were the criteriaof the project. Index number 4 (water quality), index number 1 (soil quality), and index number 7 (sanitation and safety), with relative importance weights of 0.192, 0.179, and 0.152, were ranked first to third, respectively.Discussion and Conclusion: It is very necessary to control, monitor and supervise the operation and maintenance issues of a sewage treatment plant in order to produce a standard quality effluent and increase it’s efficiency during the operation. Manuscript profile -
Open Access Article
3 - The effect of "Hydrogen peroxide- Silver ion Complex" on fecal coliform content in aerated lagoon Effluent
Mohammad Khazaei Ramin Nabizadeh Kazem Naddafi Hasan Izanlou Zeinab Yavari Mehdi AsadiAn appropriate disinfectant in water and wastewater applications must have acceptable effect on different kind of micro-organisms especially in minor concentrations which should contain ignorable toxicity on human and animals and its environmental side effects must be v MoreAn appropriate disinfectant in water and wastewater applications must have acceptable effect on different kind of micro-organisms especially in minor concentrations which should contain ignorable toxicity on human and animals and its environmental side effects must be very low. Studies related to finding non-chlorinated disinfectants which have same effects of chlorine and not contain its adverse by-products are continued in recent years. Hydrogen peroxide solution with stabilized formulation and oligo-dynamic amounts of silver ion (trade mark: Nanosil) recently become a popular disinfectant for fruits، vegetables، surfaces، medical instruments and disinfections. This study was based on determining removal efficiency of fecal coliforms from samples taken from Qom wastewater treatment plant effluents after exposing with hydrogen peroxide-silver ion complex. Disinfectant efficiency was studied in six concentrations. Contact time for all concentrations was one hour. Sample size was 12 and sampling was daily. Results reveal that in concentration; 80mg/l، disinfectant achieves 2.1 logarithmic removals of fecal coliforms. In concentration; 480mg/l، fecal coliforms logarithmic removal was 5.3. In CT value 5800(mg/l). Min and more، the fecal coliforms effluent standard for surface water discharge and agriculture irrigation was achieved (Iranian environmental protection agency act). Use of hydrogen peroxide-silver ion complex as a water and wastewater disinfectant، has various benefits such as; don't remain hazardous by products، measurable residual amount an but because of its oxidation nature when contact the organic materials in wastewater and microbial harboring in suspended solids content of effluent، its application in wastewater effluent is more costly than other usual disinfectants. Manuscript profile -
Open Access Article
4 - Evaluation of Environmental and Technical Risks in the West Ahvaz Wastewater Treatment Plant Construction Project using Hierarchical Analysis Process
Pouria Bizhanzadeh Katayoun Varshosaz Aslan EgdernezhadBackground and Objectives: Considering that urban and industrial sewage are one of the main factors of pollution entering the environment; environmental effects and technical and operational risks resulting from it have always been considered in the operating phase. But MoreBackground and Objectives: Considering that urban and industrial sewage are one of the main factors of pollution entering the environment; environmental effects and technical and operational risks resulting from it have always been considered in the operating phase. But its effects and risks are also important in the construction phase. Therefore, the current research was conducted with the aim of evaluating the environmental and technical risks of the wastewater treatment plant construction project in the west of Ahvaz with the hierarchical analysis process (AHP) in 2021. Material and Methodology: After the study phase, information related to the project was collected through the survey method and presence at the site of the treatment plant, and all executive processes, equipment and facilities were examined. For this purpose, the E-FMEA method and the opinions of experts were used to identify environmental and technical risks. Then, Analytic Hierarchy Process (AHP) was used for weighting and prioritizing the parameters of the used method. Findings: In total, 19 environmental risks and 24 technical risks were identified in the processes of the West Ahvaz treatment plant construction project. Environmental and technical risks were similar in the two stages of construction of buildings and installation of tanks and facilities. In other stages, technical risk was more important than environmental. The number difference between the two technical and environmental risks in the stages of excavation, installation of foundation and skeleton of structures was 50, 25 and 66%, respectively. Discussion and Conclusion: The comparison of all risks showed that technical risks were about 26% more than environmental risks. In general, the results showed that most of the environmental risks were at an acceptable level and 8 technical risks needed to be resolved as soon as possible. Manuscript profile -
Open Access Article
5 - Investigation of Functional Units and Method of Construction of Water Treatment Plants
Fariborz Yousefvand Ramin BayatBackground and purpose: Purified water is one of the most important elements in the health of human societies, so trying to purify water through water treatment plants is justifiable even with high costs. Surface waters often have a greater variety of pollutants than un MoreBackground and purpose: Purified water is one of the most important elements in the health of human societies, so trying to purify water through water treatment plants is justifiable even with high costs. Surface waters often have a greater variety of pollutants than underground waters, and for this reason, treatment processes may be more complicated for such waters. In water treatment plants, the purification process starts through the inlet pipe to the treatment plant and enters the urban water stream by passing through garbage collection structures, aeration, microstrainer, rapid mixing, superpulsator, sand filter and tank. Like the concentrator, the recycling tank and the contaminated mechanical dewatering are divided into two parts that can be treated and cannot be treated, and the non-degradable solids are directed out of the tank. Research method: This article has investigated the construction method and performance of different parts of water treatment plants in an executive and scientific way by reviewing reliable scientific databases and the experiences of the authors. Findings: The performance of different parts of the treatment plant and their construction methods have been analyzed and the importance and position of each part has been discussed. Discussion and conclusion: The process of water purification from the time of entering the water treatment plant to the time of its exit was investigated in detail, including the construction method, which provides useful information for planners, designers and activists in this field Manuscript profile -
Open Access Article
6 - Evaluation of Performance and Quality of Effluent in Birjand Wastewater Treatment Plant for Agricultural Purposes
Mohammad Hosein Fathabadi Mohammad Hosein Ahmadi Shadmehri Seyed Masoud Faiz Sayyid Ali BanihashemiBasis and Goal: Today, the most basic action to control pollution from wastewater and their reuse is the construction of a wastewater treatment plant and strict monitoring of their operation. Disposal of non-standard effluents and their use in agriculture or surface wat MoreBasis and Goal: Today, the most basic action to control pollution from wastewater and their reuse is the construction of a wastewater treatment plant and strict monitoring of their operation. Disposal of non-standard effluents and their use in agriculture or surface water discharge will lead to many health and environmental risks. Therefore, the present study was conducted with the aim of auditing the environmental performance and quality of Birjand wastewater treatment plant for agricultural use. Method of Studing: This study was conducted in 1399 using a cross-sectional study method from 1396 to 1398 on the wastewater treatment plant of Birjand. Finding: The findings showed that the COD index with an average of 225 had the highest non-compliance with the standard in 1396. TSS index with an average of 153 is in the second place, total coliform with an average of 1300 in the third place and gastrointestinal coliform with an average of 502.5 are in the fourth place. In 1398, these indicators are in a standard and optimal condition. Results: Comparison of the results of the current study with the effluent standards showed that the use of the effluent of this treatment plant for agricultural purposes is recommended due to compliance with the effluent standards. This trend has shown a favorable situation during the years 1396 to 1398. Manuscript profile -
Open Access Article
7 - بررسی کاربردهای مختلف پساب شهری اراک با استفاده از فرآیند تحلیل سلسله مراتبی
رضا جعفری نیا جواد وروانی مهدی فولادی پناهبحران آب در مناطق خشک و نیمه­خشک ایجاب می­کند که در زمینه کاربرد پساب­های شهری و استفاده از آن بررسی­های جامعی صورت گیرد. در این تحقیق با انجام فرآیند تحلیل سلسله مراتبی در سال 1393 با توجه به وزن نسبی معیارها که پس از تکمیل پرسشنامه و تهیه ماتریسهای او Moreبحران آب در مناطق خشک و نیمه­خشک ایجاب می­کند که در زمینه کاربرد پساب­های شهری و استفاده از آن بررسی­های جامعی صورت گیرد. در این تحقیق با انجام فرآیند تحلیل سلسله مراتبی در سال 1393 با توجه به وزن نسبی معیارها که پس از تکمیل پرسشنامه و تهیه ماتریسهای اولیه، نرمال و نتایج حاصل از آن مشخص شد، بیشترین معیار محدودکننده، معیار کیفیت پساب و سپس نسبت سود به هزینه است که بالاترین درصد وزن نسبی به آنها اختصاص داده شد (22 و 5/21 درصد به ترتیب). معیارهای بعدی به ترتیب با ارجحیت 2/20، 6/14، 5/11 و 4/10 درصد به ترتیب شامل پذیرش مردمی، سیاست­های حمایتی دولت، پتانسیل منطقه نسبت و فاصله منطقه مصرف از تصفیه خانه اولویت بعدی قرار دارند. گزینه آبیاری اراضی کشاورزی با ارجحیت 5/27 درصد برترین رتبه را به خود اختصاص داد که نشان میدهد مصرف پساب شهری اراک باید برای استفاده در آبیاری اراضی کشاورزی در اولویت قرار گیرد. گزینه دوم نیز مربوط به احیاء و توسعه مراتع حاشیه کویر میقان با ارجحیت 20 درصد می­باشد. گزینه­های بعدی به ترتیب با ارجحیت 7/18، 8/17 و 9/15 درصد به ترتیب شامل جنگل و فضای سبز، تغذیه سفره های آب زیرزمینی و صنعت در اولویت­های بعدی قرار دارند. Manuscript profile -
Open Access Article
8 - استفاده از پودر کربن فعال در فن آوری لجن فعال جهت بررسی اثر تصفیه پذیری فاضلاب صنعتی پتروشیمی در مقیاس آزمایشگاهی جهت پالایندگی آب برگشتی
محمد رضا فرشادی روحالله مختاران جواد احدیانبه منظور تعیین ویژگی­های دو سیستم تصفیه فاضلاب به روش لجن فعال، هوادهی گسترده و افزودن پودر کربن فعال به واحد هوادهی در مقیاس آزمایشگاهی و مقایسه عملکرد آنها در کاهش بار آلی ناشی از بنزن و اتیلن­دی­کلراید در فاضلاب مصنوعی مقایسه­ای صورت گرفت؛ و دو سیستم Moreبه منظور تعیین ویژگی­های دو سیستم تصفیه فاضلاب به روش لجن فعال، هوادهی گسترده و افزودن پودر کربن فعال به واحد هوادهی در مقیاس آزمایشگاهی و مقایسه عملکرد آنها در کاهش بار آلی ناشی از بنزن و اتیلن­دی­کلراید در فاضلاب مصنوعی مقایسه­ای صورت گرفت؛ و دو سیستم که یک سیستم با استفاده از پودر کربن فعال و سیستم دیگر بدون استفاده از پودر کربن فعال می­باشد در مقیاس آزمایشگاهی با حجم هوادهی 9 لیتر و واحد ته نشینی 4 لیتر طراحی و ساخته شد. با استفاده از یک فاضلاب مصنوعی با ترکیب شیمیایی معلوم مبتنی بر بنزن و اتیلن­دی­کلراید با میزان COD بین 300 تا 1100 میلی­گرم بر لیتر، دو سیستم فوق به مدت 6 ماه مورد بهره­برداری قرار گرفتند. در دوره بررسی، بازدهی کاهش و حذف مواد آلی و تغییرات مواد جامد مخلوط و نیز مواد جامد معلق فرار مایع مخلوط در هر دو سیستم در شرایط مختلف تغییر غلظت ورودی همراه با ثابت نگه­داشتن مقدار پودر کربن فعال ایرانی به میزان 2500 میلی­گرم بر لیتر و زمان ماند هیدرولیک و جامدات به ترتیب برابر با 18 ساعت و 15 روز صورت گرفت. یافته­های حاصل از این پژوهش نشان می­دهند که پودر کربن فعال انتخابی برای جذب اتیلن­دی­کلراید و بنزن در بارهای 400 و 700 میلی­گرم بر لیتر نسبت به بارهای 900 و 1100 میلی­گرم بر لیتر بهتر عمل نموده است. همچنین مشخص گردید که استفاده از پودر کربن فعال در سیستم با پودر باعث ناسازگاری سریعتر سیستم نسبت به سیستم لجن فعال در واحد هوادهی، میزان مواد جامد معلق فرار، مایع مخلوط و مواد جامد معلق مایع مخلوط بهتر از سیستم بدون پودر کربن فعال می­باشد. در صورت افزایش درصد حذف COD در سیستم، میزان مواد فوق نیز افزایش پیدا می­کنند. Manuscript profile -
Open Access Article
9 - A Study of the Effects of Purkan Village Wastewater Refinery on Qualitative Parameters of Karaj River
Faezeh Hosseini Amir hesam Hasani Amir hossein Javid Mojtaba SayadiToday the River of Karaj is exposed to all kinds of pollutions and destruction of ecosystem because of thedestructive effects of Tehran, a city with millions of residents. So it is important to examine the quality of thewater of this river to collect information about t MoreToday the River of Karaj is exposed to all kinds of pollutions and destruction of ecosystem because of thedestructive effects of Tehran, a city with millions of residents. So it is important to examine the quality of thewater of this river to collect information about the current situation. The objective of this study is to find out therole of the Purkan sanitary wastewater refinery on the quality of the water of the river. In current study, sampleswere collected from four stations: into, out of, before, and after the refinery, in seasonal form, four stages.Concentration of NO3,NH3,PO4,BOD5,COD,TSS,pH indices were tested according to methods suggested bystandard methods reference. Considering the results of the samples, data analysis was done using statistics. Theresults of physical , chemical and microbial analyses of the samples show that the refinery has no good role indecreasing basic parameters such as COD, TSS and FC (specially in summer season). In many cases, theparameters were more than the limit. The water in the river has an almost fixed condition, so; entrance of thewastewater into Karaj River does not show a great negative effect. As a result, it seems necessary to make aprogram to find a solution to remove the problems. Prevention of the direct entrance of the wastewater into theriver, modification of refinery function, optimization of filteration, and the use of wastewater in artificialirrigater may help remove these problems. Manuscript profile -
Open Access Article
10 - Evaluation of Pre-ozonation Unit Efficiency in Turbidity and TOC Removal (Case Study: Kouhsabz Water Treatment Plant)
Bahman Masoomi Nematollah Jaafarzadeh Haghighi Fard Tayebeh Tabatabaei Esmael kouhgardi Sahand JorfiThe overall objective of this study was to investigate the turbidity and total organic carbon (TOC) of raw water entering the treatment plant and the pre-ozonation unit's efficiency is to remove these compounds. Sampling from raw water and pre-ozonation water was done w MoreThe overall objective of this study was to investigate the turbidity and total organic carbon (TOC) of raw water entering the treatment plant and the pre-ozonation unit's efficiency is to remove these compounds. Sampling from raw water and pre-ozonation water was done within 6 months and tested according to the standard method of the method. The results showed that there was a direct correlation between total organic carbon content and turbidity that's more in winter and in February with a high turbidity of 18NTU and TOC above 7mg / l. It was also found that the average pre-ozonation unit efficiency in the removal of total organic carbon with an average ozone dose of 3kg / hr and the contact time 18 minutes, is 20.52%, The highest TOC removal efficiency was in February (35.7%) and the lowest removal efficiency (14.08%) in May. The average turbidity removal efficiency is 61%, the highest and lowest percentages eliminated respectively were in February with 85.2% and 30% in July. Therefore, to increase the efficiency of pre-ozonation unit in removing organic compounds and ... It is necessary to carefully consider the process and design factors To increase the efficiency of removal of compounds. Manuscript profile -
Open Access Article
11 - Modeling the Chlorine Gas Dispersion in the Water Treatment Plant
Hadi Shamizadeh Ramin Alinejad Shahabi Mehdi Arjmand
Sanad
Sanad is a platform for managing Azad University publications
Links
Related Centers
Technical Support
Official pages
The rights to this website are owned by the Raimag Press Management System.
Copyright © 2021-2024