Study of the liquid-film-forming apparatus as an alternative aeration system: design criteria and operating condition. Issue 12 (18th June 2017)

• Record Type: Journal Article
• Authors: Hongprasith, Narapong; Imai, Tsuyoshi; Painmanakul, Pisut
• Is Part Of: Environmental technology. Volume 38:Issue 12(2017)
• Page Start: 1539
• Page End: 1547
• Publication Date: 2017-06-18
• Subjects: Alternative aeration system -- diffused aerator -- liquid-film-forming apparatus -- aquaculture pond -- volumetric mass transfer coefficient -- oxygen transfer efficiency; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2016.1236841
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: Aeration is an important factor in aquaculture systems because it is a vital condition for all organisms that live in water and respire aerobically. Generally, mechanical surface aerators are widely used in Thailand due to their advantage for increasing dissolved oxygen (DO) and for their horizontal mixing of aquaculture ponds with large surface areas. However, these systems still have some drawbacks, primarily the low oxygen transfer efficiency (OTE) and energy. Regarding this issue, alternative aeration systems should be studied and applied. Therefore, this research aims to study the aeration mechanism obtained by the diffused-air aeration combined with a liquid-film-forming apparatus (LFFA). The effect of gas flow rates, types, and patterns of aerator installation were investigated in an aquaculture pond of 10 m × 10 m × 1.5 m. The analytical parameters were volumetric mass transfer coefficient ( k L a ), OTE, and aeration efficiency (AE). From the results, the '4-D' with partitions was proposed as the suitable pattern for the LFFA installation. The advantage could be obtained from high energy performance with 1.2 kg/kW h of AE. Then, the operation conditions can be applied as a design guideline for this alternative aeration system in the aquaculture ponds.