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As urban population is increasing in Indian cities, the demand for wastewater treatment capacity is never met accordingly. Centre for Science and Environment (2016) report projected that 78% of urban India sewage is not treated. Jaipur city with present 4.1 million population has its first major Sewage Treatment Plant (STP) of 125 Million Liters per Day (MLD) at Delawas in the year 2006. Since commissioning, the gap between demand versus treatment capacity widened and situation went critical from 2019 onwards. Delawas STP was a perfect example of waste to energy, wastewater through gravity was coming from 25-km area. The effluent characteristics were in concurrence with regulatory norms. With just a decade, STP failed technically. Increase in population with mushrooming of industries changed the influent characteristics and quantity. With design capacity of 125 MLD, STP was unable to handle untreated waste of the order of 160–190 MLD. Untreated waste was discharged to Dravyavati River without any treatment. This paper analyzed the technical and major issues regarding the failure of STP and upgrading it as per NGT (National Green Tribunal Norms). This includes failure of Activated Sludge Process (ASP), upgrading to SBR (Sequential Batch Reactor), issues of high volume of toxic raw sewage untreated and huge financial burden due to adherence to 2019 NGT norms.

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Feasibility of Sewage Treatment Plant with Changing Influent Characteristics and Quantity-A Case Study of Delawas STP at Jaipur City

  • 会议论文

  • 发表日期：

    2025年

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  • Rukshar,
  • Anil Dutt Vyas,
  • Nitu Bhatnagar

摘要

As urban population is increasing in Indian cities, the demand for wastewater treatment capacity is never met accordingly. Centre for Science and Environment (2016) report projected that 78% of urban India sewage is not treated. Jaipur city with present 4.1 million population has its first major Sewage Treatment Plant (STP) of 125 Million Liters per Day (MLD) at Delawas in the year 2006. Since commissioning, the gap between demand versus treatment capacity widened and situation went critical from 2019 onwards. Delawas STP was a perfect example of waste to energy, wastewater through gravity was coming from 25-km area. The effluent characteristics were in concurrence with regulatory norms. With just a decade, STP failed technically. Increase in population with mushrooming of industries changed the influent characteristics and quantity. With design capacity of 125 MLD, STP was unable to handle untreated waste of the order of 160–190 MLD. Untreated waste was discharged to Dravyavati River without any treatment. This paper analyzed the technical and major issues regarding the failure of STP and upgrading it as per NGT (National Green Tribunal Norms). This includes failure of Activated Sludge Process (ASP), upgrading to SBR (Sequential Batch Reactor), issues of high volume of toxic raw sewage untreated and huge financial burden due to adherence to 2019 NGT norms.