A Study on the Effect of Diffuser Installation Location on the Dissolved Oxygen in an Aeration Tank

2021 ◽  
Vol 29 (4) ◽  
pp. 21-28
Author(s):  
Kyeong-Ju Na ◽  
Hye-Yun Park ◽  
Chaeyoung Lee
Keyword(s):  
Dissolved Oxygen ◽  
Aeration Tank

Reoxygenation Rate for Airlift Inner Circulation Reactor

2013 ◽  
Vol 726-731 ◽  
pp. 1926-1929
Author(s):  
Ke Wu Pi ◽  
Min Xia ◽  
Shi Shi ◽  
Qu Xiao
Keyword(s):  
Dissolved Oxygen ◽  
Aeration Rate ◽  
Airlift Reactor ◽  
Liquid Level ◽  
Aeration Tank ◽  
Do Concentration

Airlift inner circulation reactor (AICR) consisting of beaker and built-in aeration tank was introduced in this paper. The Dissolved oxygen recovery (RDO) was highly influenced by the ratios of the height of built-in aeration tank to the height of liquid level in reactor (Rh/H), the diameter of built-in aeration tank to the diameter of the reactor (Rd/D) and aeration rate (QN). Average RDO of 24.25 m.gm-3.s-s and DO concentration of 8.97mg.l-1 were obtained at Rd/D=0.47, Rh/H=0.68 and QN =1.0m3.m-3.min-1 for aerating 370s at 17°C. The total transferred oxygen in 4L deoxidized water reached 35.89mg, which had an increase by 11.15% than that of the traditional airlift reactor (AR). The DO concentration was 88.33-9.34mg.l-1 for AICR, but it’s only 7.71-8.58mg.l-1 for AR.

A SYSTEM FOR DISSOLVED OXYGEN CONTROL IN INDUSTRIAL AERATION TANK

2012 ◽  
Vol 41 (1) ◽  
Author(s):  
Kęstutis Jonelis ◽  
Kęstutis Brazauskas ◽  
Donatas Levišauskas
Keyword(s):  
Dissolved Oxygen ◽  
Aeration Tank ◽  
Oxygen Control ◽  
Dissolved Oxygen Control

scholarly journals Study on Aeration Optimization and Sewage Treatment Efficiency of a Novel Micro-Pressure Swirl Reactor (MPSR)

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 890 ◽  
Author(s):  
Shengshu Ai ◽  
Shuangshi Dong ◽  
Zebing Nie ◽  
Suiyi Zhu ◽  
Qingkai Ren ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Operation Mode ◽  
Sewage Treatment ◽  
Aeration Rate ◽  
Cover Plate ◽  
Main Reaction ◽  
Water Volume ◽  
Aeration Tank ◽  
Nitrogen And Phosphorus ◽  
Pressure Swirl

This study developed a new type of micro-pressure swirl reactor (MPSR) for treating rural domestic sewage with variable water volume in northern China. The transformation of a traditional aeration tank to MPSR was mainly divided into three steps. Firstly, the aeration device was installed on one side of the aeration tank. Secondly, most of the top cover plate was sealed. Finally, the liquid level-lifting zone was set to achieve micro-pressure. The study measured the flow velocity and dissolved oxygen (DO) distribution in the main reaction zone of MPSR, studied the effects of MPSR sewage treatment in continuous operation mode and sequential batch operation mode, and analyzed the main microbial species. The experimental results showed that a stable circular circle flow and a spatial DO gradient in MPSR were formed when the aeration rate of MPSR was 0.2 m3/h. Through the MPSR sewage treatment experiment in two operation modes, it could meet the current requirements of rural environmental pollution controlled in China. Analysis of the types of microorganisms showed that microorganisms with different functions gathered in different zones of the MPSR due to the different dissolved oxygen environment and water flow environment, which further improved the ability of MPSR to simultaneously remove nitrogen and phosphorus.

Short term effects of dissolved oxygen concentration on the turbidity of the supernatant of activated sludge

1998 ◽  
Vol 38 (3) ◽  
pp. 25-33 ◽  
Author(s):  
Britt-Marie Wilén ◽  
Peter Balmér
Keyword(s):  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Adsorption Capacity ◽  
Full Scale ◽  
Aeration Tank ◽  
Batch Reactors ◽  
Short Term ◽  
Colloidal Material ◽  
Do Concentration ◽  
Short Term Effects

Short term effects of dissolved oxygen (DO) concentration on the supernatant turbidity of activated sludge were studied in batch reactors, continuous reactors and in a full scale plant. Adsorption of colloidal material onto activated sludge was studied in batch reactors. The adsorption capacity of colloidal material, expressed as removal of turbidity, was larger in aerobic than in anaerobic conditions. The difference in adsorption capacity between high (≥5 mg/l) and low (<0.5 mg/l) DO concentrations was small. Experiments were made in pilot scale completely mixed reactors where the oxygen supply was turned off during different periods of length (1-4 hours). The turbidity increased directly when the anaerobic period started and decreased when the aerobic period started. Similar results were obtained when the influent was turned off. A few full scale experiments were carried out. The aerators were adjusted to change the DO concentration along the aeration tank (plug flow) for periods of 3-6 hours. Low DO concentrations by the end of the aeration tank produced a turbidity increase of the effluent, while low DO concentrations in the first half of the aeration tank did not affect the turbidity to a large extent.

Modeling and Simulation of Dissolved Oxygen Concentrations in a Full-Scale Textile Dyeing Wastewater Treatment Plant

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Jingjie Yu ◽  
Guowei Gu ◽  
Shaopo Wang ◽  
Zhifeng Zhang ◽  
Liping Sun
Keyword(s):  
Wastewater Treatment ◽  
Dissolved Oxygen ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Aeration Tank ◽  
Dyeing Wastewater ◽  
Textile Dyeing ◽  
Textile Dyeing Wastewater ◽  
Oxygen Concentrations

A Modified Activated Sludge Model No.1 (M-ASM1), including six COD components (SI, SS, XI, XS, XH and SO) and three biochemical processes (aerobic growth of heterotrophs, aerobic decay of heterotrophs and hydrolysis of entrapped organics) is used to simulate the anaerobic hydrolysis-aeration- sedimentation treatment series in a full-scale textile dyeing wastewater treatment plant with an influent flowrate of 200,000 m3/d. M-ASM1 has the following characteristics: (1) the effect of temperature variation on biochemical reactions is included; (2) adding a parameter: ?. Using this parameter, the anaerobic hydrolysis tank and the aerobic initial compartments in which the dissolved oxygen concentrations are equal to "0 mg/L" can be differentiated; (3) the oxygen transfer coefficient KLa is excluded. Namely, as long as inputting the aeration flowrate, the pressure in the aeration pipe and other running data on air supply into this model, M-ASM1 can simulate the oxygen concentrations of each compartment in a plug-flow aeration tank.

scholarly journals Programmable logic controller-based automatic control for municipal wastewater treatment plant optimization

2021 ◽  
Author(s):  
Shunli Ning ◽  
Siyuan Hong
Keyword(s):  
Wastewater Treatment ◽  
Dissolved Oxygen ◽  
Oxygen Content ◽  
Wastewater Treatment Plant ◽  
Control Algorithm ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Programmable Logic Controller ◽  
Aeration Tank ◽  
Programmable Logic

Abstract The treatment of industrial wastewater can effectively protect the water environment and maintain sustainable development. This paper introduces an incremental proportion and integration (IPI) control algorithm-based programmable logic controller (PLC) used to adjust the aeration tank's dissolved oxygen content automatically in the wastewater treatment process. The control algorithm was improved by a back-propagation neural network (BP-NN). An instance analysis was carried out on a wastewater treatment plant in Zhejiang Province, China. This showed that the BP-NN improved control algorithm made the aeration tank's dissolved oxygen content more stable at the set value than it was with manual adjustment and the conventional algorithm. The total nitrogen content in wastewater treated in the aeration tank under the control of the improved IPI algorithm was minimized and fluctuated least. The aeration tank blower's power consumption was also at its lowest under the control of the improved IPI algorithm.

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