Filamentous sludge bulking is the key factors in deteriorating effluent quality. 丝状菌性污泥膨胀是恶化处理水水质的重要原因。
Malfunction of the metallic stent can be caused by encrustation of crystals, bacterial sludge, bile salts, and tumor compression or tumor ingrowth. 金属支架的功能障碍可以由胆管内的结晶凝块，细菌性污泥，胆盐，及肿瘤压迫或肿瘤直接侵入支架。
