碱溶液预降解淤泥有机质的效果与机制讨论

淤泥富含大量有机质，受微生物作用，有机质会逐步分解出腐殖酸；同时，腐殖酸又会影响有机质降解，进而影响淤泥固化效果。为此，通过维持恒定的碱性缓冲溶液环境（pH=9.0），将淤泥浸泡其中，观测其有机质含量的变化过程。结果表明，碱性缓冲溶液既能加快有机质分解，也能消耗腐殖酸，使溶液保持为碱性状态；当有机质分解完成，腐殖酸也释放结束，降解过程大约持续28 d。通过掺入水泥和石灰固化淤泥，发现含有机质的固化淤泥，其强度随养护时间会先增长后衰减，但预降解有机质的固化淤泥强度不会衰减。由此说明，通过碱性缓冲溶液预降解淤泥有机质，可以提升固化土耐久性。

Effect of sludge organic treated with alkaline solution and its mechanism

Sludge is rich in a large number of organic matters, and with the action of microorganisms, organic matter can be gradually decomposed by humic acid. Meanwhile, humic acid affects not only the degradation of organic matter but also the sludge solidification. Thus, the sludge is immersed in a constant alkaline buffer solution environment (pH=9.0). The results show that the alkaline buffer solution can accelerate the decomposition of organic matter, consume humic acid and keep the solution alkaline. When the decomposition of organic matter is completed, humic acid is released, and the degradation process continues to approximate 28 days. By adding cement and lime solidified silt, it is found that the strength of solidified silt containing organic matter increases firstly and then decrease with curing time, but the strength of solidified silt containing pre-degraded organic matter does not decrease. It indicates that the durability of solidified soil can be improved by pre-degradation of silt organic matter by the alkaline buffer solution.