WASTE WATER TREATMENT BY RBC

Last 32 year time,in 1987 the author have to select a title for thesis.According to lecturer,the author and friend get the title "Waste water Treatment Using RBC'.Luckily the title were cancelled because at that time the usage is not wide and highly cost to construct that type of treatment.

Now in Malaysia,there are 40 places using this type of treatment for waste water.The author have an interested to do a small analysis for value added knowing another type of waste water treatment.

WHAT IS RBC?

• RBC-Rotating Biological Contactor
• a biological type of treatment
• as secondary treatment after physical treatment
• introduced in German in 1960
• consisting of series or single of round disc
• disc are from pvc material and attached to the shaft
• slow rotating 8 round/minute
• 60 % of disc body immersed in wastewater
• water flow pepencular to shaft
• a thin layer of film consisting a bacteria and microorganisme develop at the surface of disc when disc contact with waste water
• the bacteria and microrganisme will fracture and stabilize all the organic waste
• as the film become thick,they will drop at the bed of tank
• the active sludge is flow to another treatment
• the effluent direct flow to the river
• some place an oxigen diffuser add at the bottom to accelerate the aerobic process
• BOD 5 --10--30 mg/L < 50 mg/L (JAS)
• TSS-------15--40 mg/L< 100 mg/L(JAS)

ADVANTAGES:

• silent pocess
• no need larger space
• low sludge production
• sludge collection easy by clarifier

DISADVANTAGES:

• odour
• electricity consumption high
• low temperature wastewater not effective
• skill workers needed for maintainance and  operation
• contact media not in local market
• higher cost for maintainance
• protect from rain,sun and frost

For the author,this type of treatment is the best for :

• at urban area(space constrain)
• to add to exisiting STP when increased in PE(limited space)
• to do a modification to suit what quality of inffluent
• to do a research for contact media using a local material
• to used a renewal energy for electricity
• to attach another treatment for odour,denitrification and etc to suit our inffluent
• make a variety of sewerage treatment plant