Sludge is often associated with human waste from residential sludge. However, sludge can also be produced by industrial waste, hospital waste, wastewater treatment plant, runoff from the street, farmland and in some cases from landfill leachate. Generally, sludge from residential areas is in organic form. Thus, this waste causes less harm and impact to the environment compared to industrial waste. On the other hand, industrial sludge could be in organic or inorganic form. Inorganic content is always a main concern of industrial sludge especially heavy metals that require specific treatment to prevent environmental pollution.
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