Are emissions or wastes consisting of biological nutrients good or healthy?

摘要

Biological nutrients have been defined as non-hazardous biodegradable materials and products of biodegradation processes. Changes in the concentrations of so-defined biological nutrients have ecological effects and high concentrations may have a negative impact on human health. This implies that there are no wastes or emissions derived from biological materials, which are ecologically irrelevant. Nor are such wastes intrinsically good or healthy.