| Title |
Entire co-combustion lifecycle of sewage sludge and water lettuce ( Pistia stratiotes L .) and its controls over energetic and environmental benefits |
| ID_Doc |
10625 |
| Authors |
Liang, JY; Liu, JY; Evrendilek, F; Chen, ZB; Li, LZ; Lin, S; Lin, ZT; Li, L; Wu, XY; Wang, L; He, Y |
| Title |
Entire co-combustion lifecycle of sewage sludge and water lettuce ( Pistia stratiotes L .) and its controls over energetic and environmental benefits |
| Year |
2024 |
| Published |
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| Abstract |
This study investigates the feasibility of co-combusting water lettuce (WL) and sewage sludge (SS) to enhance phosphorus (P) recovery amid its global scarcity. The addition of WL improved the SS combustion by releasing major volatiles and curbing the volatilization of alkali metal potassium. The co-combustive interaction transformed potassium-type ash of WL into sulfur-type ash, ameliorating the slagging and corrosion issues. WL blend ratio and temperature exerted different impacts on P bioavailability and metal volatilization. Given the Monte Carlo simulations for the total (main and interaction) effects of the operational settings, the WL addition outperformed the temperature as the primary driver of the green co-combustion performance. The addition of WL effectively increased P bioavailability, peaking (35.97 mg/g) at 800 degrees C. P bioavailability decreased at 1000 degrees C. As a chlorine donor, WL formed volatile metal chlorides with Pb, Zn, and Cu. The increases in the WL addition and temperature favored the Pb, Zn, and Cu volatilization, with their maximum removal rates of 98.46 %, 82.62 % and 95.66 %, respectively. However, the temperature and WL addition did not significantly affect the removal rates of Ni (less than 20 %), Cr (less than 20 %), and As (less than 45 %). This study demonstrates the metal removal and P recovery benefits of the co-combustion, offering a novel approach for promoting co-circular economy strategies. |
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