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Electro- and Photo-Fenton-Based Techniques in Wastewater Treatment for Advanced Oxidation of Recalcitrant Pollutants
Published in Maulin P. Shah, Sweta Parimita Bera, Günay Yıldız Töre, Advanced Oxidation Processes for Wastewater Treatment, 2022
Satyam, Tarun Gangar, Shweta Patel, Sanjukta Patra
Photo-Fenton reactors have a medium-pressure Hg lamp at the center of the reactor. This lamp is housed in quartz glass for proper light distribution and reduces the heat generated by the Hg lamp. These reactors support both batch and continuous (less efficient) modes of water remediation. There is a dedicated sparger connected to an air pump for constant aeration of the reactor chamber. A temperature control unit attached to the reactor’s body provides an appropriate continuous temperature for the Fenton reaction. Photo-Fenton reactors are also equipped with a tunable stirrer to mix wastewater with Fenton reagents. Advance photo-Fenton reactors have many sensors such as the dissolved oxygen sensor, pH sensor, temperature sensor, automatic reagent dispenser and water-pumping unit attached to the main reactor. Photo-Fenton reactors with the aforementioned equipment have been successfully tested to remove 83.2% of COD from landfill leachate from municipal solid waste under optimal conditions (Bañuelos et al., 2014). A schematic diagram of a photo-Fenton reactor is shown in Figure 2.3.
Practice Exam
Published in Frank R. Spellman, Handbook of Water and Wastewater Treatment Plant Operations, 2020
17.195 A turbine pump is best described as a: Piston pumpAir pumpCentrifugal pumpJet pump
Highway plant
Published in Malcolm Copson, Peter Kendrick, Steve Beresford, Roadwork, 2019
Malcolm Copson, Peter Kendrick, Steve Beresford
The filling and emptying of the tanks is by means of an exhauster–compressor pump unit. This enables the tank to be filled by suction and discharged by pressure, without the tank contents actually passing through the pump, i.e. it is a compressed air/vacuum system, the exhauster–compressor being an air pump.
Stability of aerobic granular sludge for treating inorganic wastewater with different nitrogen loading rates
Published in Environmental Technology, 2023
Mingjing Zeng, Zhenghao Li, Yuanyuan Cheng, Yi Luo, Yiran Hou, Junfeng Wu, Bei Long
The experiment was carried out in five identical sequencing batch reactors (SBRs, named as R1, R2, R3, R4 and R5). The effective volume of each reactor was 1 L (inner diameter of 65 mm and height of 500 mm), and the water exchange ratio was 50%. Aeration was provided by an electromagnetic air pump (ACO-006). The aeration rate of each reactor was 5 L/min, and the liquid level rise was approximately 3 cm. The cyclic time was 6 h (4 cycles per day), including filling (5 min), aerobic reaction (350 min), settling (3 min) and drainage (2 min). After the effluent was collected and settled for 6 h, the supernatant was discharged, and the completely settled sludge was returned to the reactor with the influent in each reactor. This operational strategy aims to retain the slow-growth nitrifying bacteria in the reactor and avoid the interference of sludge washout on the experimental results.
Rapid start-up of autotrophic shortcut nitrification system in SBR and microbial community analysis
Published in Environmental Technology, 2022
Nan Zhang, Yuecheng He, Xiang Yi, Yunan Yan, Wenlai Xu
The experimental device of SBR is shown in Figure 2. The reactor is made of organic glass, with a total height of 24.5 cm, a diameter of 16 cm, and an effective volume of 3 L. The water inlet and the water outlet are respectively set at the upper and lower ends of the reactor wall, and the inflow and outflow of the wastewater are realized by a peristaltic pump. The air diffuser is placed inside the reactor, and the aeration volume is controlled by the air pump. The reactor is equipped with a magnetic stirrer to ensure the uniform mixing of sludge, wastewater and DO, thereby avoiding the sludge layering and the uneven distribution of DO. The peristaltic pump, the air pump, and the magnetic stirrer are all connected to the automatic switch controller, which can realize automatic inflow and outflow of wastewater and control the aeration time and aeration frequency by setting the time. In addition, the experiment is also equipped with DO and pH metre for real-time monitoring.
Stability of aerobic granular sludge for simultaneous nitrogen and Pb(II) removal from inorganic wastewater
Published in Environmental Technology, 2022
Mingjing Zeng, Zhenghao Li, Yuanyuan Cheng, Bei Long, Junfeng Wu, Yu Zeng, Yong Liu
The recovery and long-term operation was carried out in two identical SBRs (named as R1 and R2). The effective volume of R1 and R2 is 27.7 L each (inner diameter of 14 mm, effective height of 180 mm), and the water exchange ratio is 60%. Granules in S2, S3 and S4 were inoculated into R2 for recovery, and granules in S1 were inoculated into R1 for recovery. In addition, granules stored in situ in R0 (the same storage conditions as S1) for 40 days were inoculated into R1 to make the sludge concentrations in R1 and R2 equal to each other. Aeration of R1 and R2 was provided by an air pump (ACO-012A). The aeration rate of each reactor was 42.5 L/min, and the liquid level rise was approximately 10 cm. The water temperature was maintained at 25–30 °C by using a heating rod (P-200W). The cyclic time was 6 h (4 cycles per day), including filling, reaction, settling and drainage (Table 1). Intermittent aeration was set in anoxic reaction to realize solid‒liquid mixing. The aeration rate was 21.3 L/min, and the liquid level rise was 3 cm. The intermittent aeration lasted for 10 min every 40 min from day 1–65 and 30 s every 15 min from day 66–140. The solids retention time of both R1 and R2 was maintained at approximately 50 days.