Gayathri T, Kavitha S, Adish Kumar S, Kaliappan S, Yeom Ick Tae, Rajesh Banu J
Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India.
Department of Civil Engineering, Thiagarajar College of Engineering, Thiruparankundram, Madurai, India.
Ultrason Sonochem. 2015 Jan;22:333-40. doi: 10.1016/j.ultsonch.2014.07.017. Epub 2014 Jul 30.
In this investigation, the application of citric acid was explored for the removal of extracellular polymeric substance (EPS) from waste activated sludge (WAS), followed by ultrasonic pretreatment, which enhanced the subsequent anaerobic biodegradability. EPS was removed with 0.05g/g SS of citric acid. The chemical oxygen demand (COD) solubilization and suspended solids (SS) reduction that occurred for specific energy input of 171.9kJ/kg TS, in deflocculated (EPS removed and ultrasonically pretreated) sludges were found to be 22.70% and 20.28% and was comparatively higher, than the flocculated (with EPS and ultrasonically pretreated). The biogas yield potential of flocculated and deflocculated sludges (specific energy input - 171.9kJ/kgTS) was found to be 0.212L/(gVS) and 0.435L/(gVS), respectively. Accordingly, the deflocculation and ultrasonic pretreatment improved the anaerobic biodegradability efficiently. Thus, this chemo mediated sonic pretreatment is an effective method for enhancing biodegradability and improving clean energy generation from WAS.
在本研究中，探索了柠檬酸在从剩余活性污泥（WAS）中去除胞外聚合物（EPS）方面的应用，随后进行超声预处理，这提高了后续的厌氧生物降解性。用0.05g/g SS的柠檬酸去除EPS。对于特定能量输入为171.9kJ/kg TS的情况，在脱絮（去除EPS并经超声预处理）污泥中发生的化学需氧量（COD）溶解和悬浮固体（SS）减少分别为22.70%和20.28%，并且比絮凝（含有EPS并经超声预处理）污泥中的情况相对更高。发现絮凝和脱絮污泥（特定能量输入 - 171.9kJ/kgTS）的沼气产量潜力分别为0.212L/（gVS）和0.435L/（gVS）。因此，脱絮和超声预处理有效地提高了厌氧生物降解性。因此，这种化学介导的超声预处理是一种提高生物降解性和改善从WAS中产生清洁能源的有效方法。
