Disinfection and solubilization of sewage sludge using the microwave enhanced advanced oxidation process

Microwave Enhanced Advanced Oxidation Process Application to Treatment of Dairy Manure

“…Microwave heating has been applied in various processes and manufacturing industries, such as food process, wood drying and waste treatment process (Jones, et al, 2002). For the sewage wastewater treatment industry, there are many applications of microwave heating on sludge treatment for reducing volume, improving dewaterability, enhancing digestibility, enhancing nutrient release, pathogen destruction, and stabilizing heavy metal (Menendez, et al, 2002;Liao, et al, 2005;Wojciechowaska 2005;Hong et al, 2006;Eskicioglu et al, 2007;Hsieh et al, 2007;Yu, et al, 2010). It has also been reported that the overall treatment efficiency could be increased with a combination of microwave heating with chemicals (thermo-chemical) for the treatment of sludge (Chan, et al, 2007;Qiao, et al, 2008).…”

Optimization of H2O2 dosage in microwave-H2O2 process for sludge pretreatment with uniform design method

“…For the same pH value, concentrations of TOC, NH 4 + -N, PO 4 3− -P, TN, and TP released were increased with the increase of H 2 O 2 :MLSS ratio. It was reported that microwave heating would increase the decomposition of H 2 O 2 into hydroxyl radicals and therefore enhance the oxidation process when H 2 O 2 was applied simultaneously with either conventional or microwave heating (Yu et al, 2010a(Yu et al, , 2010bEskicioglu et al, 2008). Additionally, Yu et al (2010aYu et al ( , 2010b found that release of organic matters was firstly increased with the increase of H 2 O 2 dosage at the same temperature, and then decreased as further increase of H 2 O 2 dosage.…”

“…As one of the most promising technologies, e.g., microwave pretreatment was proved to be the most effective for enhancing methane potential of pulp mill waste sludge, compared with ultrasonic and chemo-mechanical methods (Saha et al, 2011), studies of microwave technology and its combined processes for sludge pretreatment have received increasing attention in recent years. Microwave with pressure seal (Liao et al, 2005a), microwave under ambient pressure conditions (Cheng, 2008;Cheng et al, 2010;Yan et al, 2009), microwave-acid, microwave-alkali (Cheng, 2008;Cheng et al, 2009;Doǧan and Sanin, 2009;Yan, 2010;Chi et al, 2011;Chang et al, 2012;Erden, 2012), microwave-H 2 O 2 process (Eskicioglu et al, 2006(Eskicioglu et al, , 2007(Eskicioglu et al, , 2009Liao et al, 2005a;2005b;Lo et al, 2008;Wang, 2009;Wang et al, 2009aWang et al, , 2009bWong et al, 2006aWong et al, , 2006bYu et al, 2010aYu et al, , 2010b have been used to improve sludge disintegration and sludge disinfection, among which the microwave-H 2 O 2 (MW-H 2 O 2 ) process has been shown to be the most effective. Although some studies have focused on improving the lysis efficiency of sludge pretreated by microwave and combined processes, few studies have investigated decreasing the costs of microwave and its combined processes for sludge pretreatment, such as saving dosages of chemicals by optimizing these processes.…”

Multivariate analysis of sludge disintegration by microwave–hydrogen peroxide pretreatment process

“…The addition of H 2 O 2 in a closed-vessel MW digestion system has been reported to enhance the pretreatment of sludge markedly [23], and such advanced oxidation processes (AOPs) appear to offer promise as suitable technologies for the minimization [24] and pasteurization and stabilization [25] of excess sludge. A H 2 O 2 dosing strategy to inhibit the adverse effects of catalase at low temperatures in an open system was developed in our previous work [26].…”

“…A priori, and on the basis of a literature survey on MW and AOPs [23][24][25][26][27][28], TSS, H 2 O 2 , and pH were known to be the critical factors controlling sludge disintegration at mild temperatures (100 • C) [32]; however, the effect of pH (from acidic to basic) has not yet been fully recognized. In addition, the interactions among these three factors remain unclear.…”