Sludge treatment and recycling

Sludge is an inevitable byproduct of wastewater treatment, which, if treated improperly, will extensively pollute the environment. Due to the complex composition, sludge, which contains pathogenic microorganisms, parasitic eggs, toxic heavy metals and refractory substances, causes secondary pollution to water, soil and the atmosphere. It also poses a serious threat to the ecological environment, without applying a safe treatment. In addition, sludge landfill exhaust the scarce land, resulting in waste of resources. However, sludge is not just waste but a misplaced resource. If properly utilised, sludge can be used as a valuable fuel or feedstock.