floating sludge

activated air alga algae angled black blister blue bright bubble bulking carbamazepin carbon cold crustification dam dark deposit diclofenac dirt discharge edta effluent environment final floating floor floortile flowing fouling green ibuprofen incrustation iron metal metropolol microorganism micropollutants microthrix mud overfall overflowing plant pocket protection reflection round scaling secondary settlement slab sludge spring stainless steel sun surface teal tile treated treatment warm waste wastewater water weir