(2001) showed that changes in the rate of specific resistance to filtration depend on pH. pH is a very important parameter affecting the effectiveness of the chemical disintegration of sludge. This requires using additional reagents to acidify the sludge at the beginning as well as to neutralize after disintegration, prior to dewatering. Fenton's process is usually performed under acidic conditions (initial pH about 3.0) because they are optimal for the effective formation of hydroxyl radicals. The use of Fenton's reagent allows decreasing the capillary suction time as well as the specific resistance to filtration by even more than 90% ( Zhen et al., 2014 Lu et al., 2003 Buyukkamaci, 2004). If dewatering properties of sludge are the aim of disintegration, usually short process times are used that are not longer than 90 min. For example, if we use Fenton's reagent they are in the range of 100–6000 mg of H 2O 2 per 1 L of sludge or up to 50,000 mgH 2O 2 per 1 g of d.m. When improvement of dewatering of sewage sludge is planned, high doses of reagents are usually high. They depend on the kind of sludge and the effect that should be achieved. The doses of reagents used for sludge stabilization and disintegration vary a lot. Increasing the hydrolysis rate of excess sludge Improving susceptibility of thickened sludge to dewatering, increasing the degree of organic compound degradationĮnhancing the rate of aerobic sludge stabilization Improving susceptibility of excess sludge to dewatering
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