Disinfection of Treated Wastewater and its Reuse in the Irrigation of Golf Grass: The Case of Plant M’zar Agadir-Morocco

Hind Mouhanni,Abelaziz Bendou,Salah Er-Raki

doi:10.3390/w3041128

Abstract

The treated wastewater of Agadir M’zar plant has a good physico-chemical quality and it contains important nutrients (NPK: nitrogen, phosphorus, potassium). However, the reuse of this water, without disinfecting it, for irrigating the golf grass in the Agadir region, revealed the presence of a bacterial load that can hinder the quality and suitability of spaces for a population that is very demanding. Among the various methods of water disinfection, chlorination with bleach is the least expensive and the most systematically simple. Its effectiveness depends only on the pH of the waters to be disinfected. This study reports the results of disinfection of M’zar plant wastewater with a solution of sodium hypochlorite (bleach), and their reuse for irrigating the golf grass. For this purpose, we carried out a monitoring protocol for germination and growth parameters (number of tillers and leaf length) in order to study and compare the effect of disinfected treated wastewater (DTWW) and groundwater (GW) on the plant turf. The obtained result showed that the disinfection with bleach increased the salinity of the treated wastewater and can affect the permeability of soils and crops.

Highlights

In many part of the world, wastewater reclamation and reuse have been an interesting alternative source of water for irrigation, and many researchers have confirmed its benefits
In order to evaluate fecal pollution indicators before and after the break point of the treated wastewater, we have shown the water in the bottles 4, 9 and in the parent strain on the selective medium of total coliforms (TC) and fecal coliforms (FC)
We note an absence of fecal and total coliforms at the 9th bottle that matches the break point. This confirms the effect of disinfectant bleach to this concentration of chlorine (80 mg/L) for the treated wastewater of the M’zar plant

Summary

Introduction

In many part of the world, wastewater reclamation and reuse have been an interesting alternative source of water for irrigation, and many researchers have confirmed its benefits. It could be an economic way to decrease pollution of surface waters and provide groundwater recharge for other agricultural fields. In this context, many studies have focused on the disinfection of treated wastewater and reuse in irrigation through improving its bacteriological and chemical qualities. In Italy, Lubello et al [2] have studied the irrigation of nursery ornamental plants with tertiary effluents (filtration and peracetic acid + UV) in comparison with nutrient enriched groundwater They concluded that the refinery treatment by filtration and disinfection with peracetic acid and UV together were very effective in bacteria removal

Methods

Results

Conclusion