scholarly journals Phosphate Removal from Wastewater in Batch System Using Waste Mussel Shell

2020 ◽  
Vol 11 (4) ◽  
pp. 11473-11486
Keyword(s):  
Contact Time ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Phosphate Removal ◽  
Mussel Shell ◽  
Aquatic Life ◽  
Batch System ◽  
Domestic Wastewater Treatment ◽  
Synthetic Solution ◽  
Solution Volume

High input of phosphate (PO43–) in rivers can lead to eutrophication, which jeopardizes aquatic life and human health. In this study, PO43– was removed from synthetic solution and domestic wastewater treatment plant effluent (DWTPE) by waste mussel shell (WMS). The PO43– adsorption by WMS was examined for the initial PO43– concentration (7 mg L−1), solution volume (0.2 L), adsorbent dosage (4, 8, 12, 16, and 20 g), and contact time (1-6 d). The batch experiment's optimum performance could reach approximately 75.1% for the removal of PO43– from synthetic solution and approximately 66.2% for the removal of PO43– from DWTPE after a contact time of 5 d. This work suggests that the WMS can remove PO43 from both synthetic solution and DWTPE. Future works are necessary to increase WMS's capacity to adsorb PO43– from waters, either by physical or chemical modification.

scholarly journals Simultaneous removal of BOD, N and P in a single continuous flow real scale activated sludge reactor with cyclic aeration

2020 ◽  
Vol 15 (1) ◽  
pp. 201-212
Author(s):  
Álvaro Orozco-Jaramillo ◽  
Santiago Vélez-Velásquez
Keyword(s):  
Continuous Flow ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Aeration Tank ◽  
Domestic Wastewater Treatment ◽  
Stable Conditions ◽  
Activated Sludge Reactor ◽  
Anoxic Environment ◽  
Real Scale ◽  
Composite Samples

Abstract The present study evaluates the performance of a real scale domestic wastewater treatment plant (WWTP), operating under continuous flow conditions with ‘extremely high sludge age’, designed to remove organic matter and perform nitrification-denitrification within a single reactor under cyclic aeration. Composite samples were withdrawn from the reactor for one week and their analysis results compared satisfactorily with the calculations of the design models. The WWTP is operating under stable conditions with a BOD5 removal of 86%, COD removal of 87%, TKN removal of 73% and, unexpectedly, a stable removal of 55% of total phosphorus. The design of the WWTP is simple and consists of a single aeration tank with a kinetic selector and a secondary sedimentation tank, operating under cyclic conditions in the aeration tank, with 45-minute aeration on (oxic environment) and 15 minutes aeration off (anoxic environment). The system can be applied to upgrade WWTP from secondary to tertiary treatment with only small modifications. A phosphorus removal mechanism is also proposed.

Volatile organic compound emissions during the composting of biosolids from a domestic wastewater treatment plant

2002 ◽  
Vol 46 (10) ◽  
pp. 195-198 ◽  
Author(s):  
C.X. Ramos ◽  
S.L. Estévez ◽  
E. Giraldo
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Solid Phase ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Aeration System ◽  
Domestic Wastewater Treatment ◽  
Emission Behavior ◽  
Volatile Organic Compound Emissions ◽  
Aliphatic And Aromatic Hydrocarbons

VOCs emitted by two composting static piles of biosolids coming from the “El Salitre” wastewater treatment plant (Bogotá, Colombia) were analysed during the composting process. Each pile in its sampling time was maintained with a different aeration system. The sampling was made using Solid Phase Microextraction (SPME); separation and identifications were made using Gas Chromatography (GC) coupled to Mass Spectrometry (MS). Aliphatic and aromatic hydrocarbons, chlorinated compounds, ketones, mercaptans, alcohols and amines were identified in concentrations greater than the norms stipulated by the EPA for inhalation in humans beings. The emission behavior varied according to the aeration system used.

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