Rocher M, Roux G, Goma G, Begue A P, Louvel L, Rols J L
Centre de Bioingénierie Gilbert Durand, UMR-CNRS 5504, UR-INRA 792, Institut National des Sciences Appliquées, Toulouse, France.
Water Sci Technol. 2001;44(2-3):437-44.
With new EC regulations, alternative treatment and disposal techniques of the excess sludge produced by activated sludge wastewater treatment plants have to be developed. To decrease activated sludge production yield, microbial cell lysis can be amplified to enhance cryptic growth (biomass growth on lysates). Cell breakage techniques (thermal, alkaline and a combination) were studied to generate Ralstonia eutropha (strain model) and waste activated sludge lysates and to evaluate their biodegradability. Gentle treatment conditions by alkaline waste treatment (20 min at 60 degrees C and pH 10 by NaOH addition) allowed waste activated sludge to be solubilized by a two step process (instantaneous and post-treatment) giving a dissolved organic carbon released by the total suspended solids treated of 267 mgDOC x g(-1)TSS. The biodegradation of the soluble fraction of the lysates by fresh sludge reached 75 and 90% after 48 and 350 hrs of incubation respectively. A validation on a laboratory scale by insertion of a liquor alkaline heat treatment loop in a biological synthetic wastewater treatment process was carried out. A reduction of 37% of the excess sludge was obtained without altering the purification yield of the process.
随着新的欧盟法规出台，必须开发活性污泥污水处理厂产生的剩余污泥的替代处理和处置技术。为了降低活性污泥的产量，可以增强微生物细胞裂解以促进隐蔽生长（利用裂解产物进行生物量生长）。研究了细胞破碎技术（热法、碱法及联合法），以产生真养产碱杆菌（菌株模型）和废弃活性污泥裂解产物，并评估其生物降解性。通过碱性废物处理的温和处理条件（在60℃下用NaOH调节pH至10处理20分钟），可通过两步法（即时处理和后处理）使废弃活性污泥溶解，经处理的总悬浮固体释放的溶解有机碳为267 mgDOC·g⁻¹TSS。新鲜污泥对裂解产物可溶部分的生物降解率在培养48小时和350小时后分别达到75%和90%。通过在生物合成废水处理过程中插入碱性热处理循环进行了实验室规模的验证。在不改变该工艺净化率的情况下，剩余污泥减少了37%。
