sewage enter into septic tank will remove 50% to 60%suspended matter after 12 to 24h sediment , the sediment sludge will anaerobic digestion above 3 month, which will make the organism decompose stable inorganics, corruptible raw sludge translate to ripe sludge , it changed sludge structure, reduce sludge water ratio, clear it and transport out regular. Landfill or reuse it as fertilizer.
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