Start-up of UASB reactors treating municipal wastewater and effect of temperature/sludge age and hydraulic retention time (HRT) on its performance
The upflow anaerobic sludge blanket reactors seeded with cow dung manure (UASBCD) and activated sludge of a dairy wastewater treatment plant (UASBASDIT) were used to treat raw domestic wastewater of medium strength. The UASBCD reactor required a period of 120 days to start up. In case of UASBASDIT r...
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| Format: | Article |
| Language: | English |
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Elsevier
2015-11-01
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| Series: | Arabian Journal of Chemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1878535213004449 |
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| author | Hina Rizvi Nasir Ahmad Farhat Abbas Iftikhar Hussain Bukhari Abdullah Yasar Shafaqat Ali Tahira Yasmeen Muhammad Riaz |
| author_facet | Hina Rizvi Nasir Ahmad Farhat Abbas Iftikhar Hussain Bukhari Abdullah Yasar Shafaqat Ali Tahira Yasmeen Muhammad Riaz |
| author_sort | Hina Rizvi |
| collection | DOAJ |
| description | The upflow anaerobic sludge blanket reactors seeded with cow dung manure (UASBCD) and activated sludge of a dairy wastewater treatment plant (UASBASDIT) were used to treat raw domestic wastewater of medium strength. The UASBCD reactor required a period of 120 days to start up. In case of UASBASDIT reactor, sludge bed was stabilized in a period of 80 days. The performance of both reactors to treat wastewater was enhanced with an increase in the sludge age and temperature. Under psychrophilic temperature (17 °C) and at early sludge age (60 days), chemical oxygen demand (COD) and biochemical oxygen demand (BOD) removal by the reactors were in the range of 57–62% and 61–66%, respectively. However, chemical oxygen demand (COD) and biochemical oxygen demand (BOD) removal efficiency of the reactors elevated to the range of 79–81% and 77–83%, respectively at sludge age of 150 days and temperature of 30 °C. In short, overall performance of both reactors was optimum at sludge age ranging from 120 to 150 days and temperature varying between 25 and 30 °C. At hydraulic retention time (HRT) of 9 h the chemical oxygen demand (COD), total suspended solids (TSS) and sulfate removal efficiency of UASBCD reactor reached 81%, 75% and 76%, respectively and 77%, 74% and 69%, respectively for UASBASDIT. The rate of removal of these parameters however, gradually declined with increasing hydraulic retention time. The UASB technology provides a low-cost system for the direct treatment of municipal wastewater and can be applied in small communities. |
| first_indexed | 2024-12-20T07:32:43Z |
| format | Article |
| id | doaj.art-ff1cb576d2914960a77713660402dc9d |
| institution | Directory Open Access Journal |
| issn | 1878-5352 |
| language | English |
| last_indexed | 2024-12-20T07:32:43Z |
| publishDate | 2015-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Arabian Journal of Chemistry |
| spelling | doaj.art-ff1cb576d2914960a77713660402dc9d2022-12-21T19:48:22ZengElsevierArabian Journal of Chemistry1878-53522015-11-018678078610.1016/j.arabjc.2013.12.016Start-up of UASB reactors treating municipal wastewater and effect of temperature/sludge age and hydraulic retention time (HRT) on its performanceHina Rizvi0Nasir Ahmad1Farhat Abbas2Iftikhar Hussain Bukhari3Abdullah Yasar4Shafaqat Ali5Tahira Yasmeen6Muhammad Riaz7Environmental Sciences Department, Government College University, Faisalabad 38000, PakistanInstitute of Geology, University of the Punjab, Lahore, PakistanEnvironmental Sciences Department, Government College University, Faisalabad 38000, PakistanDepartment of Chemistry, Government College University, Faisalabad 38000, PakistanSustainable Development Study Center, Government College University, Lahore, PakistanEnvironmental Sciences Department, Government College University, Faisalabad 38000, PakistanEnvironmental Sciences Department, Government College University, Faisalabad 38000, PakistanDepartment of Chemistry, Government College University, Faisalabad 38000, PakistanThe upflow anaerobic sludge blanket reactors seeded with cow dung manure (UASBCD) and activated sludge of a dairy wastewater treatment plant (UASBASDIT) were used to treat raw domestic wastewater of medium strength. The UASBCD reactor required a period of 120 days to start up. In case of UASBASDIT reactor, sludge bed was stabilized in a period of 80 days. The performance of both reactors to treat wastewater was enhanced with an increase in the sludge age and temperature. Under psychrophilic temperature (17 °C) and at early sludge age (60 days), chemical oxygen demand (COD) and biochemical oxygen demand (BOD) removal by the reactors were in the range of 57–62% and 61–66%, respectively. However, chemical oxygen demand (COD) and biochemical oxygen demand (BOD) removal efficiency of the reactors elevated to the range of 79–81% and 77–83%, respectively at sludge age of 150 days and temperature of 30 °C. In short, overall performance of both reactors was optimum at sludge age ranging from 120 to 150 days and temperature varying between 25 and 30 °C. At hydraulic retention time (HRT) of 9 h the chemical oxygen demand (COD), total suspended solids (TSS) and sulfate removal efficiency of UASBCD reactor reached 81%, 75% and 76%, respectively and 77%, 74% and 69%, respectively for UASBASDIT. The rate of removal of these parameters however, gradually declined with increasing hydraulic retention time. The UASB technology provides a low-cost system for the direct treatment of municipal wastewater and can be applied in small communities.http://www.sciencedirect.com/science/article/pii/S1878535213004449UASB reactorsMunicipal wastewaterSludgeHydraulic retention time (HRT)Chemical oxygen demand (COD) and biochemical oxygen demand (BOD) |
| spellingShingle | Hina Rizvi Nasir Ahmad Farhat Abbas Iftikhar Hussain Bukhari Abdullah Yasar Shafaqat Ali Tahira Yasmeen Muhammad Riaz Start-up of UASB reactors treating municipal wastewater and effect of temperature/sludge age and hydraulic retention time (HRT) on its performance Arabian Journal of Chemistry UASB reactors Municipal wastewater Sludge Hydraulic retention time (HRT) Chemical oxygen demand (COD) and biochemical oxygen demand (BOD) |
| title | Start-up of UASB reactors treating municipal wastewater and effect of temperature/sludge age and hydraulic retention time (HRT) on its performance |
| title_full | Start-up of UASB reactors treating municipal wastewater and effect of temperature/sludge age and hydraulic retention time (HRT) on its performance |
| title_fullStr | Start-up of UASB reactors treating municipal wastewater and effect of temperature/sludge age and hydraulic retention time (HRT) on its performance |
| title_full_unstemmed | Start-up of UASB reactors treating municipal wastewater and effect of temperature/sludge age and hydraulic retention time (HRT) on its performance |
| title_short | Start-up of UASB reactors treating municipal wastewater and effect of temperature/sludge age and hydraulic retention time (HRT) on its performance |
| title_sort | start up of uasb reactors treating municipal wastewater and effect of temperature sludge age and hydraulic retention time hrt on its performance |
| topic | UASB reactors Municipal wastewater Sludge Hydraulic retention time (HRT) Chemical oxygen demand (COD) and biochemical oxygen demand (BOD) |
| url | http://www.sciencedirect.com/science/article/pii/S1878535213004449 |
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