... involved, the quality standards to be met, the skilled staff and land requirements, and the reliability of the potential for recovery by the technology, all have to be evaluated to give a total ... environmental effects of the production process, lack of understanding of the true costs of waste management, no access to technical advice, insufficient knowledge of the implementation of new technologies, ... volume of less than 0.5 per cent of the wastewater flow. Heavy metals and other micro-pollutants tend to accumulate in the sludge because they often adsorb onto suspended particles. Nowadays, the...