Rotational speed of the discs was 6,8,10 rpm and 42% submergence. In contrast, systems in which microorganisms are sustained in a liquid are known as suspendedgrowth processes. Rotating biological contactor systems have been hit by a number of construction and operating problems, including the failure of the equipment used to treat. Rotating biological contactors rbcs for wastewater treatment began in the 1970s. A steadystate model of nitrification and organic carbon oxidation in the rotating biological contactor process is developed and verified. Pdf nitrification in rotating biological contactors.
The biological treatment attached growth study guide is an important resource for preparing for the certification exam and is arranged by chapters and sections. Rotating biological contactors are used for wastewater treatment requiring low land area, maintenance, energy or startup costs and can facilitate a more decentralised water treatment network hiras et al. The existing relationships were studied among the different types of filamentous microorganisms that appear in the biofilm of a biological contactor system. In the rbc process design it has to be determined the type and dimensions of medium and degree of submergence, the rotational speed, number. Use of rotating biological contactors for nitrification at the city of guelph water pollution control plant, guelph, ontario, canada. In the present paper, significance of rbc system for treating urinal wastewater has also been elaborated.
The rotating biological contactor is an attached growth biological treatment used in removal of biodegradable matter present in wastewater is popular due to its. Each issue of clear waters will have more questions from a different section of wastewater treatment. Media in the form of several large flat or corrugated discs with biofilm attached to the surface are mounted on a common shaft partially submerged. Anaerobic ammonium oxidation with nitrite to n 2 anammox is a recently discovered microbial reaction with interesting potential for nitrogen removal from wastewater. Rotating biological contactors are an efficient fixedfilm wastewater technology well suited for secondary andor advanced biological treatment. The rotating biological contactor rbc is a fixed film biological secondary treatment device. Rotating biological contractor is one type of treatment system. The longterm reliability of this process is evident in the thousands of units in operation for more than 40 years with evoqua as the original equipment manufacturer oem.
It consists of a series of closely spaced, parallel discs mounted on a rotating shaft which is supported just above the. The characteristic of liquid film flow on disc in rotating. Performance and operation of a rotating biological. This twolesson unit on rotating biological contactors rbcs is designed to be used with students who have had some experience in wastewater treatment and a basic understanding of biological treatment. Design criteria for a rotating biological contactor system. In these reactors, biofilm support material consist of discs, with a certain uniform distance between each other, coupled to a rotating horizontal shaft driven by a motor. A rotating biological contactor or rbc is a biological treatment process used in the treatment of wastewater following primary treatment. Abstract the management of the medium and small scale industries feel burden to treat waste if the cost involvement is high.
Rotating biological contactor rbc central to the kees rbc treatment technology of wastewater is the rotating biological contactor rbc, which supports a biologically active film, or biomass, of aerobic microorganisms. Hochheimer fred wheaton, professor national committee for quality assurance biological resources engineering dept. Treatment of municipal wastewater by using rotating. Its well suited for secondary and or advanced treatment in municipal and industrial applications. The principal advantages of the rbc stem from the fact that the interfacial area generated is very high and practically independent of the speed of rotation, unlike in the activated sludge process. The process consists of large diameter corrugated plastic media. It is also designed for existing operators to test their knowledge. Physicochemical and biological treatment of olive mill.
A rotating biological contactor is a type of secondary treatment process. Characteristics of rotating biological contactor rbc sludges. The advantages of using rotating biological contactors rbc in wastewater treatment plants outweigh the disadvantages of installing and operating the system. Where a nitrified effluent is required, rbc can be. The rotating biological contactors rbcs or simply biodiscs are part of the socalled biofilm processes. Introduction rbcs are a fixed film, aerobic, biological wastewater treatment system the primary function of these bioreactors at wwtps is the reduction. Rotary biological contactors ce 370 2 biological treatment primary sedimentation secondary sedimentation biological treatment influent effluent.
The rotating biological contactor rbc is a unique adaptation of the movingmedium attached growth biofilm system which offers an alternative technology to the conventional asp treatment process. Various design criteria have been set for rotating biological contactor rbc for treating urinal wastewater. Pdf performance and operation of a rotating biological. Effluent bod characteristics for secondary treatment are comparable to well operated asp. The process has found more recent application in the united states for similar types of waste particularly those from dairy and food processing industries. Rotating biological contactors are used for wastewater treatment requiring 127 low land area, maintenance, energy or startup costs and can facilitate a more decentralised water 128 treatment network hiras et al. The widespread use of rotating biological contactors rbc began in europe over four decades ago.
Performance and operation of a rotating biological contactor in a tilapia recirculating aquaculture system. A rotating biolgoical contactor rbc, is a secondary biological treatment process which utilizes a rotating shaft surrounded by plastic media discs. Bacterial community structure in rotating biological. Rotating biological contactors sswm find tools for sustainable. Full nitrification is achievable under appropriate process conditions. Characteristics of rotating biological contactor rbc. Each section consists of key knowledges with important informational concepts you need to know for the certification exam. Removal of organic matter has been targeted within organic loading rates of up to 120 g m. Biological treatment attachedgrowth processes study guide. The disadvantages of rotating biological contactors. Operational problems with rotating biological contactors.
During the 1970s and early 1980s, the rotating biological contactor process rbc, a particularly efficient fixed film process, became popular. However, the primary manufacturer of rbcs in the united states manufactured. Relationships among filamentous microorganisms in rotating. The rotating biological contactor process rbc has been used increasingly in europe for the treatment of domestic wastewaters and for some industrial wastes. Proceedings of the 1st national symposiumworkshop on rotating biological contactor technology, vol.
The first lesson provides information on the concepts and components of rbc. Measurement of the thickness of liquid film is important, because it affect the transfer of oxygen from the air into the water, through the liquid film. These systems are known as attachedgrowth processes. Miller a fullscale rotating biological contactor rbc sys tem, designed to achieve effluent limitations of 10 mg1 5day biochemical oxygen demand bod5 and 2 mg1 of ammonia nitrogen nh3n for domestic wastewater, performed at less than design expectations. Hence there is a board scope for cheaper and compact unit processes or ideal solutions for such issues.
Applicability tfs enable organic material in the wastewater to be. Rotating biological contactors sswm find tools for. Rotating biological contactors for wastewater treatment. Rotating biological contactor rbc wastewater treatment. In operation, a media, consisting of a series of circular disks mounted side by side on a common shaft is rotated through the wastewater flow. The rotating biological contactor process offers the specific advantages of a biofilm system in treatment of wastewater for removal of soluble organic substances and nitrogen compounds. It is a unique adaptation of the movingmedium biofilm system which facilitates easy and effective oxygen transfer. Rotating biological contactor rotating biological contactors, commonly called rbcs, are used in wastewater treatment plants wwtps. The results of wastewater the paper prove that the cod removal in rotating biological contactor systems is a function of biofilm the organic loading rate. In the primary settlement zone settles gross solids into sludge, the supernatant liquor then passes forwards into the biozone. Rotating biological contactors rbc are a conventional aerobic biological wastewater treatment unit. The characteristic of liquid film over the disk surface, with the disc as contact media in rotating biological contactor rbc would be evaluated on the flat and contoured surface. Rotating biological contactor rbc equipment is frequently used for domestic and mining effluent treatment.
Rotating biological contactors rbcs offer an alternative treatment technology to the conventional activated sludge process. Pdf rotating biological contactors rbcs constitute a very unique and superior alternative for biodegradable matter and nitrogen removal on. Use of the rotating biological contactor by rex taicheong. Nazemi, alireza bbrc, department of chemical and petroleum engineering, sharif university of technology, p. The primary function of these bioreactors at wwtps is the reduction organic matter. Pdf rotating biological contactors rbcs have been used as an efficient fixed film method of treating wastewater due to its advantages such. Rotating biological contactor moving bed rbc mb wastewater treatment technology corix water systems cws rotating biological contactor moving bed rbcmb uses a unique highrate attached growth moving bed media, which provides near saturation levels of oxygen in the first stage without supplemental blowers.
This study conducted to treat the textile industry effluent in effective way using filamentous microbes. Enrichment and characterization of an anammox bacterium. They are used in conventional wastewater treatment plants as secondary treatment after primary sedimentation of domestic grey or. The rotating biological contactors rbcs or simply biodiscs are part of the so called biofilm. Operational problems with rotating biological contactors john a. Organic loading weight per unit time per volume is useful for the design of rotating biological contactors rbc. Rotating biological contactor sewage treatment reverse. Rotating biological contactors rbcs are used in the treatment of wastewater as a secondary treatment process. They are partially submerged and rotated as wastewater flows through.
Operation of rotating biological contactor study on. Design information on rotating biological contactors. The aim of treating urinal wastewater is to remove odour and color from it so that it can be recycled for flushing. Treatment system with rbc can be designed to provide to provide secondary or advanced level of treatment.
The rotating biological contactor process offers the specific advantages of a biofilm system in treatment of wastewater for removal of soluble organic substances. The primary treatment process means protection by removal of grit and sand and coarse material through a screening process, followed by a removal process of sediment by settling. Rotating biological contactor systems the walker process rotating biological contactor provides a simple and effective method of providing secondary andor advanced wastewater treatment by a natural biological process. Rbc technology can be applied to a huge range of situations, depending on the site and the volume of wastewater to be treated.
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