Patent ID: 6159380
Filing Date: 2000-12-12
Classification: C02F,Y02W,Y10S

Abstract:
A method for removing heavy metals, paint residues, fats, oils and grease from wastewater and processing the resulting solid wastes in an apparatus, the method comprising the steps of:a) placing wastewater into a reactor/settling tank;b) additively mixing a water purifying composition and an oxidant into the wastewater to yield a mixture;c) neutralizing the pH of the mixture to 7.5-9.4;d) allowing the mixture to stand until the purifying composition forms a sludge at the bottom of the tank leaving an essentially heavy metal and oil free supernatant;e) pumping the resulting supernatant through a filter to yield recyclable wastewater suitable for disposal or reuse;f) pumping the sludge to a holding tank where the sludge is thickened; andg) pumping the sludge to a solar dewatering unit, wherein said sludge is dewatered to a water content of less than 50%, wherein the reactor/settling tank, the holding tank and solar dewatering unit of the apparatus are arranged to form a portable unit.