NOVELTY - Biological degradation of oily sludge involves transferring homogeneous slurry from receiving tank (24) to sequencing batch reactor tank (22), circulating homogeneous slurry through first recirculation line and sequencing batch reactor tank, activating a recirculation pump within first recirculation line, providing a pH controller coupled to the first recirculation line to monitor homogeneous slurry flowing through first recirculation line, passing the contaminated air through biofilters (28), and aerating homogeneous slurry.    USE - Method for biological degradation of oily sludge (claimed) used in food processors, feed lots, paper industry, oil refineries, and automotive industries.    ADVANTAGE - The method provides economical and feasible biological treatment. The method uses simple yet highly effective apparatus. The method reduces fouling of ultrafiltration membranes.    DETAILED DESCRIPTION - Biological degradation of oily sludge comprises providing a receiving tank to receive the oily sludge, diluting oily sludge with water in receiving tank to produce homogeneous slurry, transferring the homogeneous slurry from the receiving tank to a sequencing batch reactor tank, providing a trash pump and a first recirculation line, circulating the homogeneous slurry through the first recirculation line and the sequencing batch reactor tank for a reaction cycle time period, activating a recirculation pump within the first recirculation line to circulate the homogeneous slurry through the first recirculation line and sequencing batch reactor tank for the reaction cycle time period, providing a concentrated solution of nutrients to the homogeneous slurry as the homogeneous slurry flows through the first recirculation line to supply organic and inorganic nutrients to the homogeneous slurry, providing a pH controller coupled to the first recirculation line to monitor the homogeneous slurry flowing through the first recirculation line, providing a storage tank containing a solution of sodium hydroxide (50 %) and storage tank supply pump, activating the storage tank supply pump to transfer the solution of sodium hydroxide (50 %) to first recirculation line to neutralize carboxylic acids produced during initial degradation of hydrocarbons within the homogeneous slurry and maintain neutral pH, providing a discharge line and two discharge pumps within the discharge line, deactivating the recirculation pump to allow supernatant and solid waste within the homogeneous slurry to settle to the bottom end of the sequencing batch reactor tank, activating the first discharge pump to withdraw the supernatant and solid waste from the sequencing batch reactor tank, providing an ultrafiltration unit (26) located within the discharge line, providing a bag filter within the discharge line upstream from the ultrafiltration unit, removing larger particles of the supernatant and solid waste withdrawn from the sequencing batch reactor tank which reduces fouling of the ultrafiltration membranes of the ultrafiltration unit, removing smaller suspended particles of the supernatant and solid waste withdrawn from the sequencing batch reactor tank, and discharging a clean effluent from the ultrafiltration unit having less than 100 parts per million of the hydrocarbons, providing biofilters connected to the upper portion of the sequencing batch reactor tank and the receiving tank, withdrawing contaminated air from the receiving tank and the sequencing batch reactor tank and providing the contaminated air to the biofilters, passing the contaminated air through biofilters, aerating the homogeneous slurry as the homogeneous slurry circulates through the sequencing batch reactor tank with a first aeration system disposed in a bottom portion of the sequencing batch reactor tank and then with a second aeration system disposed in a bottom portion of the receiving tank, providing a main blower connected to two aeration systems, providing an exhaust blower connected to biofilters to withdraw the contaminated air from the receiving tank and the sequencing batch reactor tank and provide the contaminated air to biofilters, providing a three way valve, activating the second discharge pump to withdraw the supernatant and solid waste from the bag filter after the bag filter removes larger particles of the supernatant and solid waste withdrawn from the sequencing batch reactor tank, providing a second recirculation line having one end connected to the second outlet port of the three way valve and an opposite end extending vertically downward into the receiving tank, providing a system controller (30) connected to the trash pump, the recirculation pump, the storage tank supply pump, the first discharge pump and the second discharge pump to selectively activate and deactivate the trash pump, the recirculation pump, the storage tank supply pump, the first discharge pump and the second discharge pump, and setting the three way valve to provide for a fluid flow of the homogenous slurry from the receiving tank to the sequencing batch reactor tank or setting the three way valve to provide for the fluid flow of the homogenous slurry from the receiving tank through the second recirculation line to the receiving tank. The pH controller activates the storage tank supply pump to transfer the solution of sodium hydroxide (60 %) to the first recirculation line. One end of the discharge line is connected to a second outlet port at the bottom end of the sequencing batch reactor tank. The ultrafiltration unit has ultrafiltration membranes. The activating of the first discharge pump transfers the supernatant and solid waste from the sequencing batch reactor tank through the discharge line to the bag filter. The bag filter removes larger particles of the supernatant and solid waste withdrawn from the sequencing batch reactor tank. The ultrafiltration unit removes the smaller suspended particles of the supernatant and solid waste withdrawn from the sequencing batch reactor tank. Each biofilters has compost in it. The compost is in each biofilter captures and degrades volatilized hydrocarbons, ammonia, and hydrogen sulfide within the contaminated air. The first aeration system has air nozzles providing pressurized air to the sequencing batch reactor tank. The first aeration system is active for the reaction cycle time period and turned off at a conclusion of the reaction cycle time period. The second aeration system having air nozzles providing pressurized air to the receiving tank.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the bioreactor system for biological degradation of oily sludge.    Bioreactor system (20)    Batch reactor tank (22)    Receiving tank (24)    Ultrafiltration unit (26)    System controller (30)