Pretreatment of Secondary Effluent for Drip Irrigation
Publication: Journal of Irrigation and Drainage Engineering
Volume 120, Issue 4
Abstract
A pilot‐scale treatment system, for developing drip‐irrigation pretreatment criteria, was designed, installed, and operated intermittently over 5,300 h using activated sludge secondary effluent. Principal unit processes studied were granular‐medium filtration and screen filters for removal of suspended solids, and chlorination treatment at various injection frequencies and concentrations to prevent biofilm formation in emitters and distribution lines. Two types of 4 L/h (1 gal./h) drip emitters were tested—automatic self‐flushing and tortuous‐path turbulent‐flow emitters. Adequate filtration reduced both the required frequency of chlorination and lateral flushing. Intermittent chlorination with 2 mg/L free residual chlorine during the last hour of an irrigation cycle was found as effective as continuous chlorination with 0.4 mg/L free residual chlorine in preventing biofilm formation in emitters and distribution networks. Pretreatment recommendations for these types of emitter designs are presented.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 120 • Issue 4 • July 1994
Pages: 716 - 731
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Sep 7, 1993
Published online: Jul 1, 1994
Published in print: Jul 1994
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