Development of Bubble Removal System in Water Treatment using High Pressure Air

SeungMin Woo1   Uyeh Daniel  Dooyum1   YeongSu Kim1   JunHee  Kim1   YunSu  Kim1   SeokHo  Kang1   YuShin Ha1,*   

1Department of Bio Industrial Machinery Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea

Abstract

There are problems associated with air bubble formation in water treatment tanks. The formation of bubbles hinders particle agglomeration and can trigger flocs during conventional coagulation-flocculation-sedimentation, leading to congestion of filters. Bubbles formed inside filters also impede performance by generating unwanted headloss commonly known as air binding. Consequently, a device to remove bubble from water during treatment is needed. High-pressure air device is usually divided into water-conditioned microbial release tank, rotor motor attenuator, compressor, and compressed air piping. This regulates the amount of compressed air in the air injection device, and the temperature of the external tank through the heater. In this study, the air injection unit is assembled and placed against the inclined direction of the support rod of the first diameter section. It consisted of a structure that allows high-pressure air injected through the nozzle which forms a slope at a constant angle from the air supply tube to be sprayed. The nozzle is adjustable perpendicularly to the surface according to the size or amount of bubbles. The bubble removal experiment conducted showed an optimum of 19 G in the needle standard of compressed air, 30 rpm in the number of rotations of the dispensing equipment, 5 kg/cm2 pressure of compressed air, approximately 13 seconds in bubble removal time, and 454 L/min in bubble removal performance. A bubble removal system in water treatment using high pressure air was developed.

Figures & Tables

Fig. 1. Experiment device for bubble removal using high pressure air