Physicochemical and biological combined treatment applied to a food industry wastewater for reuse

Abstract

The aim of this study was to improve the wastewater treatment plant (WWTP) efficiency of a food industry. Despite the anaerobic-aerobic treatment, the efficiency of the plant is poor because of the high pollutants load derived mainly from the use of disinfectants and sanitizers. These cleaning products are used in the production process. In order to achieve the main goal of the study, the pollutants load reduction was targeted and a physicochemical treatment was added for that purpose. For this effort, the tests were divided in three parts. The first consisted of performing coagulation-flocculation laboratory tests to select the best chemical reagent for reduction of the high load of pollutants present in the influent. The evaluated compounds were ferric chloride, aluminum sulphate, hydroxychloride of aluminum (AHC) and polyaluminum sulphate (PAS). The second was a pilot plant study in which physicochemical and biological treatment werecombined. Finally processes were verified in the WWTP characterizing the effluent and evaluating the process for compliance with standards for reuse water. The results showed that the best coagulant was hidroxichloride of aluminium. Improving the relationship Chemical Oxygen Demand/ Biological Oxygen Demand (COD/BOD(5)) of 0.27 to 0.45 and getting a dose of 1 to 5 mg L(- 1) in the laboratory, which improved to make scaling to plant 0.5 to 2 mg L(- 1) with efficiencies removal of contaminants 98% for COD, 95% for BOD(5), 99% for O&G, to 99% for TSS and helminth eggs were not detect. The wastewater was characterized with cyclic voltammetry and the sludge produced with AHC was analyzed by scanning electron microscopy (SEM) and energy-dispersion spectroscopy (EDS).

Preparation of Chitosan Coated Magnetic Hydroxyapatite Nanoparticles and Application for Adsorption of Reactive Blue 19 and Ni2+Ions

“…Recently, problems of removing dyes and heavy metals from wastewater in the industry have been becoming an important and significant field in wastewater treatment. There are many wastewater treatment methods used for dyes and heavy metals removal from wastewater [ 3 , 4 ]: chemical treatment [ 5 ], biological method [ 6 ], physicochemical method [ 7 ], electrochemical process [ 8 ], adsorption [ 9 ], and photocatalytic degradation [ 10 ]. One of these methods called the adsorption method has become one of the most effective and feasible technique.…”

Exploring controls on the fate of PVP-capped silver nanoparticles in primary wastewater treatment

“…These flocculant concentrations were chosen to be representative of those used in the wastewater treatment industry. [65][66][67][68][69] Data treatment. Raw scattering data were corrected for the experimentally-determined neutron transmission and background scattering of each sample, the sample pathlength, and for the efficiency and spatial linearity of the detectors, according to standard procedures using the instrumentspecific software COLETTE, 70 before being converted into scattered neutron intensity data, IIJQ).…”

Assessment of coagulation‐ultrafiltration performance for the treatment of primary wastewater using alum sludge

“…; Pavon‐Silva et al . ). The practical effects of precoagulation using FeCl 3 , Fe 2 (SO 4 ) 3 , Al 2 (SO 4 ) 3 and polyaluminium chloride (PACl) on membrane fouling have been widely investigated (Duan & Gregory ; Shon et al .…”

“…Different pretreatment methods have been used for UF membrane process including coagulation, adsorption, prefiltration and oxidation (Korbutowicz et al 2006;Kim et al 2008;Janssen et al 2010;Jeong et al 2014). The coagulationflocculation has shown a good potential for improving DOC removal and reducing membrane fouling (Guigui et al 2002;Park et al 2002;Kim et al 2005;Pavon-Silva et al 2009). The practical effects of precoagulation using FeCl 3 , Fe 2 (SO 4 ) 3 , Al 2 (SO 4 ) 3 and polyaluminium chloride (PACl) on membrane fouling have been widely investigated (Duan & Gregory 2003;Shon et al 2005;Xiangli et al 2008;Zheng Yu et al 2013).…”