در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Sustainable Rural Development
- نوع مقاله: Journal Article
- کلمات کلیدی: Food Security,Integral futures studies,Foresight,water crisis,Virtual workshop
- چکیده:
- چکیده انگلیسی: Purpose: Coping water scarcity and food production in Iran require some appropriate Futures Studies (FS) paradigm. Integral Futures Studies (IFS) is applied and examined for studying the futures of water supply for food production in I. R. of Iran.
Methods: Virtual workshop, as a web based foresight procedure, is developed and implemented according to IFS circumstances for a future based structured social dialogue, among Iranian stakeholders. The first phase of the foresight procedure (pre-foresight) lasted 6 months, 105 national stakeholders were registered to take part in online discussions, surveys, and workshops, and to share their ideas and opinions on future agendas and trends. During this phase, the objective and subjective parts of the knowledge on shaping the future were integrated into one system. Finally 36 volunteers evaluated the pre-foresight.
Results: IWRM and AM are some global approaches to solve the water allocation challenges at watershed or national levels. Under such circumstances future studies needs to bring closer divergent views, promote understandings, and interests; strengthen their consensus on the future interests and benefits of the nation, and renew their commitment to the preservation and management of water resources. So IFS could regard as a more suitable paradigm through coping water challenges for food production at national level. Behind some special results, procedure results (5C) of this study were examined. The percentages of participants consensus on the effectiveness of the examined issues were as follows: 1) Promoting thinking about the future (91%); 2) Clarifying the effective factors (88%); 3) Promoting thinking systematically (91%); 4) Forming new networks and communications (78%); 5) Promoting social learning about the subject of the study (89%); 6) Promoting cooperation among the participants (72%); and 7) Promoting consensus among the relevant stakeholders (75%).
Conclusion: Finally, virtual workshop as a web based procedure and according to IFS circumstances, could promote a deep and continual structured and future oriented dialogue among the relevant stakeholders across the country for coping water challenges for food production at national level.- انتشار مقاله: 24-09-1395
- نویسندگان: Ali Akbar Azimi Dezfuli,Roknoddin Eftekhari Abdoreza,Ghadir Nezamipur,Eva Hideg
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Health Sciences and Surveillance System
- نوع مقاله: Journal Article
- کلمات کلیدی: Nitrate,Groundwater,Denitrification,Plastic filament,Grape extract
- چکیده:
- چکیده انگلیسی: Abstract Background: The compounds which contain nitrogen entering the environment can cause some problems, such as eutrophication for water resources and potential risk for human health because of methemoglobinemia and cancer. Biological techniques are effective in removing nitrate. The aim of this study was to remove nitrate from groundwater using denitrification. The main objectives of this research were determining the reduction of water nitrate based on different retention time and also the effect of using grape extract as organic matter and electron acceptor in biological nitrate removal from water. Methods: In this experimental study, the effect of heterotrophic Pseudomonas separated from Shiraz wastewater treatment plant on removing nitrate from groundwater was investigated at pilot scale using grape extract as carbon source and filamentous media at constant pH (7±0.1) and temperature (20±1 °C). During this study, 2 pilots were made. Pilot number 1 was used for separation and growth of the above mentioned bacteria (Pseudomonas) that are able to remove nitrate. Pilot number 2 was also used for surveying the removal of nitrate by these bacteria. At least, 13 samples were examined in every retention time and each test was repeated for 2 or 3 times. Statistical analysis was performed in SPSS (ver.19) software using one-way repeated measures ANOVA, and Bonferroni tests. Results: According to the results, nitrate removal rates were 49%, 55%, 67% and, 67% at retention times of 1, 1.5, 2, and 2.5 hours, respectively. The best retention time was 2 hours with 67% removal rate (P<0.05). Conclusion: The results showed that using grape extract as the carbon source and proper growth of bacteria in filamentous media led to a significant increase in the removal rate.
- انتشار مقاله: 21-01-1395
- نویسندگان: Leila Keshtgar,Ali Akbar Azimi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Ozone,reactor,sludge reduction,Oxidation of sludge,Yield coefficient
- چکیده:
- چکیده انگلیسی: The excessive biological sludge production is one of the disadvantages of aerobic process such as SBR. So the problem of excess sludge production along with its treatment , and disposal in aerobic processes in municipal and industrial waste water can be seen in many parts of the world even in our country . to solve the problem of excess sludge production , reducing in by oxidizing some of the sludge by Ozone is a suitable idea , thus reducing the biomass coefficient as well as the sewage sludge disposal. In this study, Two SBR reactors with of 20 liter being controlled by on-line system are used. After providing the steady state in the reactors, along the 8 month research sampling and testing parameters such as COD, MLSS, MLVSS, DO, SOUR, SVI, residual ozone and Yield coefficient were done. The results showed that during the solid retention time of 10 days the kinetic coefficient of Y and Kd was 0.58 (mg Biomass / mg COD) and 0.058 (1/day) respectively. At the next stage of research, different concentrations of ozone in one liter of the returned sludge to reactor were used to reduced the excess biological sludge production. The results showed that the 20 mg ozone per gram of MLSS in one liter of the returned sludge to reactor is able to reduce Yield coefficient from 0.58 to 0. 28 (mg Biomass/mg COD),In other words, the biological excess sludge by 52 % .but the soluble COD increased slightly in the effluent and the removal percentage decreased from 92 in blank reactor to 64 in test reactor. While the amount of SVI and SOUR in this consumed ozone concentration reduced 9 mgO2/h.gVSS and 20 ml/g respectively. No sludge was seen in the 25 mg ozone concentration per gram of MLSS in one liter of the returned sludge to reactor.
- انتشار مقاله: 01-05-1387
- نویسندگان: Afshin Takdastan,Naser Mehrdadi,Ali Akbar Azimi,Ali Torabian,Gholamreza Nabi Bidhendi
- مشاهده