Abstract
In this paper, the parameters, models, and application of a microwave-assisted heating (MWAH) method for rapid analysis of sludge concentration were studied. For activated/physicochemical sludge concentrations (2000–4000 mg/L) analysis, the feasible parameters using a MWAH method were microwave drying time of 5–10 min with microwave radiation power of 280, 560, 800 W, respectively. F- and t-tests confirmed that there were no significant differences between MWAH and conventional method. MWAH models between activated/physicochemical sludge concentrations (1000–12,000 mg/L), microwave radiation power as well as drying time were established. The relative errors were in the range of ±10% by applying these models. In addition, MWAH model based on 800 W of microwave radiation power was applied for rapid analysis of real wastewater sludge samples with different properties. Results demonstrated that sludge concentrations determined by MWAH method had high precision and could satisfy the analysis requirement of conventional method. Compared with conventional method, the microwave drying time and energy consumption by MWAH method can be reduced by 83.3% and 86.7%, respectively. Our study indicated that MWAH method was a rapid and low energy alternative to conventional method for sludge concentration determination in wastewater treatment systems.
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