| 摘要 |
A water filtration process and apparatus which includes the steps of treating well water with a coagulating agent or flocculant such as aluminum sulfate and/or potassium permanganate and aluminum chlorohydrate and directing the treated effluent water stream containing positively charged coagulated contaminant particles into a series of filter chambers packed with finely crushed rocks, sand and/or negatively-charged glass filter medium of random particle size. The water is filtered through the glass filter medium from top to bottom and the filtered potable effluent removed from the bottom of the filter chambers and typically directed to a storage tank. A closed-system, clarified water recycle backwash system is also provided, wherein water clarified in a series of interconnected backwash tanks is introduced into the well water effluent line and filtered as the potable filtered effluent is back-flushed through backwashed filter chamber or chambers in a desired sequence, to remove the impurities, residue and chemicals from the glass filter media. The accumulated impurities, residue and chemicals introduced with the backwash water into the backwash tanks are periodically removed from the tanks, typically by vacuum trucks.
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