Discuss the physical and chemical characteristics of sludge and other solids produced during wastewater treatment operations. Be sure and provide additional focus on digested primary sludge and anticipated heavy metal content in sludge.

Congressman patrick indicates that he is opposed to tax proposals that call for a flat tax rate because the structure would not tax those individuals who have the ability to pay the tax. discuss the position of the congressman, giving consideration to tax rate structures (e.g., progressive, proportional, and regressive) and the concept of equity.