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Physico‐chemical characteristics and biodegradability of primary effluent and particulate matter removed by microscreens

In this study, the physical, chemical, and biological characteristics of raw wastewater were compared with the liquid and solid streams generated by a primary clarifier (PC), a rotating belt filter (RBF, 350 μm), and a drum filter (DF, 60 μm) and series (SER) combination of an RBF with a PC or a DF...

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Published in:Water environment research 2023-04, Vol.95 (4), p.e10854-n/a
Main Authors: Alizadeh, Sanaz, Chowdhury, Pankaj, Ghodsi, Vahid, Giaccherini, Francesca, Sarathy, Siva, Santoro, Domenico, Comeau, Yves
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description In this study, the physical, chemical, and biological characteristics of raw wastewater were compared with the liquid and solid streams generated by a primary clarifier (PC), a rotating belt filter (RBF, 350 μm), and a drum filter (DF, 60 μm) and series (SER) combination of an RBF with a PC or a DF using pilot‐scale primary treatment units. The RBF removed about 36% of the influent total suspended solids. The DF and PC yielded an influent total suspended solid removal of 47% to 55% in both individual (parallel) and SER configurations. The size fractionation and chemical characterizations of the liquid fractions indicated a significant change in the wastewater composition in both filter configurations with no variation in the biodegradability of liquid fractions. The solids recovered by RBF had a higher total solids (TS) concentration and a higher volatile solids (VS) content (0.92 g VS/g TS) than that of DF and PC treatments (0.58 to 0.84 g VS/g TS). DF and PC sludge demonstrated a higher biodegradability rate (k1; 0.11 d−1 
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The retained solids in the SER configuration demonstrated a significantly lower theoretical biochemical methane potential than the parallel configuration, likely due to the presence of smaller particles with a significantly higher ratio of particulate chemical oxygen demand over volatile suspended solids (1.86 to 2.40 g chemical oxygen demand/g volatile suspended solids). These results indicated that the physical, chemical, and biological characteristics of liquid and solids from different filter configurations are required to determine design criteria to upgrade or retrofit water resource recovery facilities using an RBF or a DF. Practitioner Points A rotating belt filter (RBF) removed less solids than a drum filter (DF) or a primary clarifier (PC). A series configuration of an RBF with either a DF or PC resulted in an effluent with a lower proportion of slowly biodegradable organic matter than in a parallel configuration. 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The retained solids in the SER configuration demonstrated a significantly lower theoretical biochemical methane potential than the parallel configuration, likely due to the presence of smaller particles with a significantly higher ratio of particulate chemical oxygen demand over volatile suspended solids (1.86 to 2.40 g chemical oxygen demand/g volatile suspended solids). These results indicated that the physical, chemical, and biological characteristics of liquid and solids from different filter configurations are required to determine design criteria to upgrade or retrofit water resource recovery facilities using an RBF or a DF. Practitioner Points A rotating belt filter (RBF) removed less solids than a drum filter (DF) or a primary clarifier (PC). A series configuration of an RBF with either a DF or PC resulted in an effluent with a lower proportion of slowly biodegradable organic matter than in a parallel configuration. 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source Wiley-Blackwell Read & Publish Collection
subjects Belt filters
Biodegradability
Biodegradation
Chemical oxygen demand
Clarifiers
Configurations
Design criteria
Drum filters
Effluents
Fractionation
Influents
Methane
micro‐sieving
Organic matter
organic matter recovery
Oxygen
Oxygen requirement
Particulate Matter
primary treatment
Raw wastewater
Resource recovery
Retrofitting
Rotation
Sewage - chemistry
Sludge
Solid suspensions
Suspended particulate matter
Total suspended solids
Volatile solids
Waste Disposal, Fluid - methods
Wastewater
Wastewater composition
Water resources
title Physico‐chemical characteristics and biodegradability of primary effluent and particulate matter removed by microscreens
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