It can be used when the sludge is heavily contaminated with heavy metals or other undesirable pollutants. The latter is most costly, because fuel is needed and air pollution control requires extensive treatment of the combustion gases.
Options for sludge treatment include stabilisation and incineration. To reduce the water content thickening, dewatering or drying of the sludge is needed. In 2016 Aqua-Aerobic Systems partnered with Royal HaskoningDHV to expand Aerobic Granular Sludge Technology into North America and is the exclusive. Combined primary and secondary sludge from a sludge treatment plant contains about 2 % solids and hence 98 % water. After 20 years of research and development, this innovative biological solution is now proving to be one of the most soughtafter, progressive wastewater biological treatment technologies. Sludge contains a high concentration of solids, but its water content is still high. The organic carbon in the sludge, once stabilized, is also desirable as a soil conditioner, because it provides improved soil structure for plant roots. Treatment of sludge contaminated with high concentrations of heavy metals or toxic chemicals will be more difficult and the potential for re-use of the sludge will be limited.įecal sludge contains essential nutrients (nitrogen and phosphorus) and is potentially beneficial as fertilizers for plants. Sludge may be contaminated with heavy metals and other pollutants, especially when industrial wastes are disposed into the sewer. Sludge should, however, always be handled with care to avoid contact with pathogens. The former may contain large numbers of pathogens, whereas the latter will contain much less due to pathogen die-off. The treatment required is therefore dependent on the characteristics of the sludge. The characteristics of sludge vary widely from relatively fresh fecal materials to sludge, which has undergone bacterial decomposition (e.g. Sludge is produced from the treatment of wastewater in on-site and off-site system.
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