Grey water treatment through biofilm development and sediment accumulation in a horizontal batch-operated open reactor

To upgrade grey water for higher-purpose reuse in decentralized systems, simple process unit operations for mineralization of bulk organic matter and removal of non- or slowly degradable particles are required. We conducted two 16-day experiments on light grey water, using a shallow, open to the air...

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Bibliographic Details
Published in:Urban water journal 2019-09, Vol.16 (8), p.594-599
Main Authors: Prajapati, B., Bergen Jensen, M.
Format: Article
Language:English
Subjects:
Aeration
Biodegradation
Biofilms
Chemical oxygen demand
decentralized system
Drainage
dual porosity filtration
Facilities planning
Gravity
Greywater
Mineralization
Organic chemistry
Organic matter
passive aeration
Polyamide resins
Reactors
Residence time
reuse
Sedimentation
Solid suspensions
Stagnant water
Suspended particulate matter
suspended solids
Total suspended solids
Turbidity
Water reuse
Water treatment
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Summary:To upgrade grey water for higher-purpose reuse in decentralized systems, simple process unit operations for mineralization of bulk organic matter and removal of non- or slowly degradable particles are required. We conducted two 16-day experiments on light grey water, using a shallow, open to the air reactor of 2 m × 0.6 m × 0.05 m, equipped with a 0.05 m thick polyamide net to support passively aerated biofilm, and applying a gravity-driven batch flow-mode at 1.44 m 3 /day, first with full drainage of each batch (60 L), then with only half drainage (30 L), leaving a stagnant water layer behind. Turbidity, chemical oxygen demand and total suspended solids were significantly reduced in both experiments, documenting the passive aeration to be efficient, and some sedimentation to take place. Despite 50% shorter hydraulic residence time, the biofilm developed faster and was better distributed in the half drainage experiment, endorsing this principle.
ISSN:1573-062X
1744-9006
DOI:10.1080/1573062X.2019.1687741