Toxic metals, such as cadmium, lead or chromium as well as high concentrations of other potentially harmful elements, e.g., nickel or copper, often pass into eco systems through sewage sludge from industrial sites, as well as from weathering or wearing of pipes, reactors and other industrial facilities. Hence, a close monitoring of sewage sludge is the key to meeting statutory limits, and to allow targeted intervention in case of potential hazards
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