INTRODUCTION Sewage -general considerations It is the technique of removing harmful impurities from wastewater and household waste waters, both runoff (effluents) and domestic. This process involves physical, chemical, and biological processes to remove all types of contaminants. Its objective is to zero liquid discharge and provide useful fresh water in the environment. The sewage water is often adversely contaminated with many toxic organic and inorganic compounds. sewage treatment plant (Project picture) Sewage can be defined as the wastewater that is collected form some area and then conveyed to some point of disposal. The liquid wastes will require treatment before they are discharged into the water body or otherwise disposed of without endangering the public health or causing offensive conditions. With the growth of population and the modern cities the conventional method of wastewater disposal has been replaced by the planed water-carried sewage system. E
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