The material collected on bar screens and skimmings from the primary clarifier is properly disposed of by:

The material collected on bar screens and skimmings from the primary clarifier is typically disposed of by sending it to a landfill. This method is preferred because bar screens and skimmings consist of solid waste that is not suitable for further processing in the wastewater treatment plant.

Landfilling ensures that these materials are contained properly and do not cause environmental pollution. It involves placing these materials in designated areas where they can be managed according to environmental regulations, minimizing potential harm to the environment and public health.

Other disposal methods such as burning or burying in a hole may not comply with regulatory standards or might not effectively manage the waste. Burning can release harmful toxins into the air, while simply digging a hole and burying waste lacks the necessary precautions for long-term containment and environmental safety. Putting the material in a digester is also inappropriate, as digesters are designed for organic waste that can be broken down biologically, not for solid waste collected from bar screens and skimmings. Thus, landfill disposal aligns with best practices for handling this specific type of waste.