Danish industry helps clean up sewage sludge

A study by Denmark's environmental protection agency (EPA) has found that industrial wastewater is generally no more polluted than that from domestic households. Analysis of sludge from 160 municipal sewage plants suggested that households were the largest single source of mercury, and that concentrations of pollutants tended to fall as the proportion of industrial effluent in sewage increased - probably because of regional and local authorities' "thorough regulation" of the industrial sector. A government target of 50% sewage sludge clean enough to be reused as fertiliser is in sight, the agency added. See EPA newsletter, an article and the full report.

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