Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, China.
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, China.
Environ Pollut. 2020 Oct;265(Pt A):115095. doi: 10.1016/j.envpol.2020.115095. Epub 2020 Jun 26.
Sludge is an inevitable by-product of municipal wastewater treatment processes, and its high moisture content poses a major challenge for its subsequent treatment and disposal. Previous studies have explored the effects of applying modified corn-core powder (MCCP) on dewatering sludge. Here, we characterized the effects of applying both MCCP and sludge-based biochar (SBB) on dewatering sludge. Analysis of the anti-shear ability of SBB revealed that SBB was a skeleton builder with high compressive strength, demonstrating that SBB could maintain the permeability of sludge under high-pressure filtration processes and facilitate the flow of bound water. Dissipative particle dynamics (DPD) was used to simulated the sludge flocculating process and verify the feasibility of the experiment. As the simulation progressed, the reaction in the sludge network reached equilibrium and the simulated structure of the sludge became loose. The dewatering performance and physicochemical properties of the treated sludge were studied to further characterize the effect of this combined technology. Compared with MCCP-sludge, MCCP&SBB-sludge, which was treated by 20% DS (mass of dry solids in sludge) of SBB and 20% DS of MCCP, achieved superior dewaterability. This combined method reduced the specific resistance of filtration by 76% and enlarged the net sludge solids yield by 138%. Further study of the properties of MCCP&SBB-sludge revealed a loose structure that resembled the structure recovered by the simulation, suggesting that the DPD simulation method simulated the sludge flocculating process successfully. Therefore, the combined application of MCCP and SBB was superior for sludge dewatering because of the synergistic effects of MCCP and SBB.
污泥是城市污水处理过程中的必然副产物，其高含水量对后续的处理和处置构成了重大挑战。先前的研究已经探讨了应用改性玉米芯粉（MCCP）对脱水污泥的影响。在这里，我们研究了同时应用 MCCP 和基于污泥的生物炭（SBB）对脱水污泥的影响。对 SBB 抗剪能力的分析表明，SBB 是一种具有高抗压强度的骨架构建体，表明 SBB 可以在高压过滤过程中保持污泥的渗透性并促进结合水的流动。耗散粒子动力学（DPD）用于模拟污泥絮凝过程，并验证实验的可行性。随着模拟的进行，污泥网络中的反应达到平衡，污泥的模拟结构变得松散。研究了处理后污泥的脱水性能和物理化学性质，以进一步表征这种组合技术的效果。与 MCCP-污泥相比，用 20% DS（污泥干固体质量）的 SBB 和 20% DS 的 MCCP 处理的 MCCP&SBB-污泥具有更好的脱水性能。这种组合方法将过滤比阻降低了 76%，净污泥固体产率增加了 138%。进一步研究 MCCP&SBB-污泥的性质表明，其结构松散，类似于模拟恢复的结构，表明 DPD 模拟方法成功模拟了污泥絮凝过程。因此，由于 MCCP 和 SBB 的协同作用，MCCP 和 SBB 的联合应用更有利于污泥脱水。
