Abstract
In this study, the solid retention time (SRT) was varied with the ambient temperature for a full-scale municipal activated sludge plant with capacity of 200,000 PE (Population Equivalent) located in a humid sub-tropical environment. The effects of ambient temperature on treatment performance were investigated. Off-line samples were collected and analyzed from the treatment plant. The actual temperature variation during the study period was divided into three overlapping ranges and the SRT was adjusted accordingly with temperature in order to achieve the desired effluent quality. The plant’s observed effluent quality and thereby its overall removal efficiency was evaluated in terms of measuring standard biochemical parameters. The results indicate that significant improvement in effluent quality can be obtained by applying the variable SRT (5–7 days) dependent on temperature variation.
Highlights
IntroductionEra), in what is modern day Pakistan, is considered the pioneer of the construction and operation of the earliest wastewater management system in the world [1]
Based upon archeological evidence, the Mohenjo-Daro Civilization of 1500 BCE (Before CommonEra), in what is modern day Pakistan, is considered the pioneer of the construction and operation of the earliest wastewater management system in the world [1]
The temperature is decreasing because of the standard variations in the seasonal weather pattern experienced in Islamabad at this time of the year
Summary
Era), in what is modern day Pakistan, is considered the pioneer of the construction and operation of the earliest wastewater management system in the world [1]. At present and like for most other developing countries, the wastewater management systems in modern day Pakistan are either improperly managed or non-existent. In a typical developing country, the municipal and industrial effluents are usually discharged into the river or nearest watercourse without any treatment and Pakistan is no exception in this case [2]. This practice is both environmentally unacceptable and obviously creates a potential threat to human and aquatic life alike [3].
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