International Research Journal of Engineering and Technology (IRJET) Volume: 10 Issue: 07 | July 2023
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e-ISSN: 2395-0056 p-ISSN: 2395-0072
Analysis of Sludge (from Sewage Treatment Plant) Mixing methods in Anaerobic Digesters for Production of Bio-Gas Man Singh Mirdha1, Mr. Hemant Kumar Agarwal2 M.Tech Student Jagan Nath University, Jaipur Assistant Professor Department of Civil Engg. Jagan Nath University, Jaipur -----------------------------------------------------------------------***--------------------------------------------------------------------Abstract - This study investigates the biogas generation of sewage sludge using anaerobic digestion from Delawas 1
Sewage Treatment Plant located in Jaipur city, which is capital city of Rajasthan. In addition, different mixing techniques for anaerobic digestion and pretreatment of sewage sludge is studied and implied for optimum biogas generation. Sludge recirculation, most common mixing technology is combined with plate heat exchanger to heat the sludge going inside the digesters and performance of same has been studied thoroughly. Similarly, most basic pretreatment of sewage sludge i.e. gravity thickening is used to optimize the digesters volume. Several other mixing methods are discussed and used such as, mechanical agitation, gas-sludge ejector & mixing system. Following the completion of this study, biogas generation with respect to feeding, mixing and pretreatment are discussed thoroughly to pinpoint the optimum inlet parameters and mixing & feeding patterns. The findings of the scenario analysis show the impact of optimizing OLR and consistency in feeding to digesters are very crucial for optimum biogas generation and health of anaerobic digesters. Also the effect of mixing by implying different mixing techniques shows positive results for enhanced biogas generation.
1. INTRODUCTION The number of rivers in India's network is as high as 113, and the country's extensive alluvial basins store an abundant supply of groundwater. India has a wealth of water resources. In addition, the Indian subcontinent is endowed with snowcovered mountains in the Himalayan range, which provide the country with a diverse supply of water resources. Many regions of the country's accessible water resources are being depleted, and as a consequence, the quality of the water has degraded. This is due to the country's fast population growth, as well as the necessity to fulfil the rising needs of irrigation, residential consumption, and industrial usage. Domestic sewage, industrial effluents, and agricultural runoff are the primary contributors to water pollution in India. As the trend toward urbanization continues across the globe, one of the most critical problems to address is urban environmental management. Urban planners are faced with a number of issues, one of which is the requirement to assure the continuous provision of fundamental human services such as water and sanitation. A significant obstacle is presented by the inadequate handling of municipal wastewater in many urban centers located in the south. In major cities, wastewater treatment and disposal is a difficult challenge. The improper disposal of wastewater contributes to the contamination of both aquatic and terrestrial environments. As a result of serving tainted water, it leads to a variety of health concerns as well as epidemics. The water bodies get eutrophicated as a result of its addition, which results in the death of aquatic biological resources. Therefore, treatment plants play an important part in the environmentally responsible use of wastewater since they render the water useful for a variety of applications. A knowledge of the characteristics of the wastewater being managed is necessary for the efficient treatment of any type of wastewater. Not only is detailed parameterization data for these characteristics required to facilitate the effective design of wastewater treatment and disposal systems, but it is also required to enable the development and application of water conservation and waste load reduction strategies. However, wastewater characteristics must be predicted for the vast majority of existing projects as well as almost every potential construction. (Kumar & Chopra, 2012). Despite possessing just 4% of the world's fresh water resources, India is responsible for more than 16% of the world's people's well-being. In India, the total quantity of wastewater generated annually by 200 cities is roughly 2,600 Mm3, and the use of sewage effluents for irrigation of agricultural fields is becoming more prevalent, particularly in the peri-urban area. Trace metal concentrations in sewage discharge vary from city to city. These waste fluids include significant amounts of nutrients as well as trace amounts of harmful metals. Despite the fact that the concentration of heavy metals in sewage
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