碱热联合破解污泥效果及动力学研究

研究了碱热联合处理对污泥的破解效果并进行了动力学分析.结果表明,碱的加入显著提高了热处理的破解效果,NaOH的破解效果比Ca(OH)2好.碱热联合处理脱水泥饼的适宜处理参数为140℃、90min、Ca(OH)2和NaOH投加量为0.25g/g总固体(TS).在该条件下,溶解性化学需氧量(SCOD)比未加碱时分别增加了41.26%和198%,质量减少率分别为50%、57%.采用NaOH碱热破解污泥后的SCOD值与热处理温度(T)、处理时间(t)及投碱量(A)的关系可以用幂指数模型表示:SCODNa=10178.17T ]0.43 A ]0.59t 0.24.

Effects and kinetics model of combined alkaline and thermal sludge treatment

The combined alkaline and thermal treatment was used to disintegrate the dewatered sludge. The treatment process was studied and a kinetics model was built. The results showed that alkaline application can significantly promote the sludge disintegration compared with the only thermal treatment, and NaOH has higher efficiency than Ca(OH)2. The best parameters of combined alkaline and thermal treatment are 140℃, 90minutes, and the alkaline dose of 0.25g/g total solid (TS). Under this condition, the soluble chemical oxygen demand (SCOD) has an increase of 41.26% or 198% and the mass reduction ratio can reach 50% and 57% respectively with the assistance of Ca(OH)2 or NaOH. The relationship of the SCOD variation and the treatment temperature (T), duration (t) and NaOH dosage (A) can be described with an exponential model: SCODNa=10178.17 T ]0.43 A ]0.59 t 0.24.