Cadmium and sewage sludge

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…anic matter content, soil texture, soil micronutrients status, etc. Transfer of Cadmium into Sewage Sludge Approximately 20% of cadmium present in sewage sludge is derived from domestic sources which have been outlined in this chapter. Concentrated human waste can contain a high intensity of Cadmium. This level is however extremely variable depending on the location, but a mean level of 29 ppm dry matter appears to be a fairly accurate concentration. The remaining 80% originates from industrial sources.