Water management in a concrete plant: Moringa oleifera employment analysis without wastewater treatment and reuse proposal after treatment

ABSTRACT The civil construction acivities, great consumers of raw material and water resources, ha demonstrated signs to achieve a sustainable production. In this sector, the management and reuse of residual waters in concrete batchers would contribute in the decrease of negative impacts with relation to environment. However, to make the residual water reuse, viable, it is needed to make its threat, aimming the adequacy of such indicators as, alkalinity, residual free chlorine, hardness, ph and turbidity with the current regulations. Therefore, this article avaluated the possible applications for residual water threated with the use of “moringa oleifera” aqueous extract, obtained by two ways, as: only in distilled water (EAMO) and other in water distilled with calcium nitrate (EAMO/Ca2+) and with aluminium sulfate (Al2(SO4)3) as the chemical coagulant. The analized threats made the decrease of alkalinity to 22% with EAMO/Ca2+ and 16% with the Al2(SO4)3

摘要 土木工程活动作为原材料与水资源的消耗大户，目前已展现出实现可持续生产的发展态势。在该领域中，混凝土搅拌站的残水管理与回用，有助于降低对环境的负面影响。然而，要实现残水回用的可行性，需对其进行处理，以使碱度、余氯、硬度、pH值、浊度等指标符合现行法规要求。据此，本文评估了采用两种方式制备的辣木（Moringa oleifera）水提物处理残水的潜在应用场景：一种仅以蒸馏水为溶剂制备（EAMO），另一种则以添加硝酸钙的蒸馏水为溶剂制备（EAMO/Ca²⁺），并以硫酸铝（Al₂(SO₄)₃）作为化学混凝剂。经分析，采用EAMO/Ca²⁺处理可使碱度降低22%，采用硫酸铝处理则可使碱度降低16%。