Practical project of 100 TPD domestic waste water treatment system for a colledge campus sewage reuse case. We use membrane bioreactor (MBR) to treat domestic waste water.
1. Domestic Wastewater TreatmentDomestic Wastewater Treatment
— Case study
Contact info
Web: www.conhoo.com
Email: info@conhoo.com
Tel: +86 20 3112 9583
Fax: +86 20 3112 6793
2. About domestic wastewater treatmentAbout domestic wastewater treatment
• Domestic wastewater treatment is the process of removing contaminants from
wastewater, primarily from household sewage. It includes wastewater from
kitchen, bathroom etc. Sewage can be dangerous for humans and
environment, attribute to it containing large mount of bacteria, viruses and
parasites ( including worms and protozoans). Thus it should be treated before
discharged the resident domestic wastewater into the natural water bodies.
• As people aware of environment protection and saving water resource, some
community developed to reuse domestic wastewater as green plants water by
domestic wasterwater treatment system.
3. Water Treatment Process
Usually we use membrane bioreactor (MBR) to treat domestic
waste water, and the process as the follow chart shows:
4. Process description
The MBR process is a suspended growth activated sludge system
that utilizes microporous membranes for solid/liquid
separation in lieu of secondary clarifiers. The typical
arrangement shown in Figure 1 includes submerged
membranes in the aerated portion of the bioreactor, an anoxic
zone and internal mixed liquor recycle . Incorporation of
anaerobic zones for biological phosphorus removal has been
the focus of recent research, and there is at least one full scale
facility of this type being designed presently in North America.
As a further alternative to Figure 1, some plants have used
pressure membranes (rather than submerged membranes)
external to the bioreactor.
5. Pratical case info
• Project : campus sewage reuse project
• capacity : 100m³/d
• Raw water type : resort sewage
• Reuse water quality : (as follow table)
CODcr,
mg/L
BOD5, mg/L
Ammonia-
nitrogen,
mg/L
SS(mg/L) Recovery rate
MBR product
water quailty
<40 <10 <10 5 81%