TY - JOUR ID - 75560 TI - Effects of nanobubble aeration in oxygen transfer efficiency and sludge production in wastewater biological treatment JO - Journal of Advances in Environmental Health Research JA - JAEHR LA - en SN - 2676-3478 AU - Ahmadi, Mehrdad AU - Nabi Bidhendi, Gholamreza AU - Torabian, Ali AU - Mehrdadi, Nasser AD - PhD Scholar, Department of Environmental Engineering, Graduate Faculty of Environment, University of Tehran, Tehran, Iran AD - Professor, Department of Environmental Engineering, Graduate Faculty of Environment, University of Tehran, Tehran, Iran Y1 - 2018 PY - 2018 VL - 6 IS - 4 SP - 225 EP - 233 KW - Air Nanobubbles KW - Dissolved oxygen KW - Excess Sludge KW - Biological Wastewater Treatment DO - 10.22102/jaehr.2018.135459.1086 N2 - Low efficiency of conventional aeration techniques and the excessive production and disposal of sludge are great concerns in biological wastewater treatment systems. The present study aimed to evaluate the active sludge method using batch reactors under continuous operation to determine the efficiency of aeration and sludge production through microbubble and nanobubble aeration. The results indicated that compared to microbubble aeration, nanobubble aeration increased the concentration of dissolved oxygen in the mixed liqueur of the reactor (from 2 to 4.5 mg/l), while reducing the production of excess sludge from 100 to 40 ml/g (SRT: 15-40 d). With the same SRT duration, these values were within the range of 160-70 ml/g using fine-bubble aeration. According to the results, nanobubble aeration could increase the efficiency of aeration, thereby increasing the capacity of the treatment plant and reducing the costs of biological wastewater treatment. UR - https://jaehr.muk.ac.ir/article_75560.html L1 - https://jaehr.muk.ac.ir/article_75560_5a9995f1f5fc329ab2bb1d2636f76a0b.pdf ER -