Jolis Domènec
Wastewater Enterprise, Public Utilities Commission, 750 Phelps Street, San Francisco, CA 94124, USA.
Water Environ Res. 2008 Jul;80(7):654-62. doi: 10.2175/193864708x267414.
High-solids anaerobic digestion can consistently achieve 55 to 60% volatile solids destruction after thermal hydrolysis pretreatment, which reduces its viscosity and increases the fraction of soluble organic matter. For feed sludge with total solids concentrations between 6.8 and 8.2%, the process is stable at hydraulic retention times of 9 to 12 days, significantly increasing the treatment capacity of existing digesters or, in treatment plants without spare capacity, helping to postpone, reduce, or even avoid costly infrastructure investments. Process stability is related to the high concentration of soluble organic matter in the digesters. High-solids temperature-phased digestion appears to be superior to high-solids mesophilic digestion, with respect to process flexibility and stability, biosolids stabilization, and biogas generation, although ammonia inhibition may have occurred. Implementation of high-solids digestion could significantly reduce operation and maintenance costs of solids-handling operations.
经过热水解预处理后，高固体厌氧消化能够持续实现55%至60%的挥发性固体去除率，这降低了其粘度并增加了可溶性有机物的比例。对于总固体浓度在6.8%至8.2%之间的进料污泥，该工艺在9至12天的水力停留时间内稳定运行，显著提高了现有消化池的处理能力，或者在没有备用容量的处理厂中，有助于推迟、减少甚至避免昂贵的基础设施投资。工艺稳定性与消化池中高浓度的可溶性有机物有关。尽管可能发生了氨抑制现象，但就工艺灵活性和稳定性、生物固体稳定化以及沼气产生而言，高固体温度分段消化似乎优于高固体中温消化。实施高固体消化可显著降低固体处理操作的运营和维护成本。
