| The oily wastewater has high-concentrations of organic matter. the complex of which is quality components. If you need to remove the ammonia and nitrogen in wastewater. General biological treatment of oil wastewater need to set the anaerobic, anoxic and aerobic pond. According to this methods. It will increase the area of treatment facilities and improve the construction costs of the Wastewater Treatment Plant. The process of oxidation ditch can make up the shortcoming of the oily wastewater, low the cost process of operation, operation management and maintenance.This paper mainly study the initiation of oxidation ditch process of oily wastewater, investigate the requiring time of acclimatization oxidation ditch treatment of oil wastewater. On the test of the various oxidation ditch parameters. Determine the most suitable treatment for oily waste operating conditions. Investigate the sludge load and influence of the easy biodegradation of carbon sources on removal of oil. And study the oxidation oily wastewater treatment capacity for shock load tolerance.The oxidation ditch initiation experimental results show that the dissolved oxygen consistency of oxidation ditch aerobic zone should be under the control of 2-3mg/L,the consistency of the anaerobic zone should be under the control of 0-0.3mg/LL,pH between 7 to 8,the age of sludge is the 12d,the sludge recycle ratio is of 80%-150%,the HRT is 24h,temperature is between 26-28,The COD consistency should be increased from 400mg/L to 800mg/L,it need 22 days to increase ammonia and nitrogen from 20mg/L to 60mg/L to run normally;it need 20days to increase oil consistency from 10mg/L to 80mg/L to run normally; in the experiment, Aeolosma hemprichii brings up the SVI problems can be solved by increasing the ammonia loading and controlling the pH of 7.5 to 8.Oxidation ditch treatment of oil wastewater results show that when the HRT is at 24h, the Oxidation ditch can disposal most efficiently. on the COD, ammonia nitrogen and oil removal rate are 91.8%,96.0% and 91.9%; COD sludge loading is in 0.291 kgCOD/(kgvss·d), ammonia nitrogen load is 0.0124 kg/(kgvss·d),when the Fuel oil load is 0.0165 kg/ (kgvss·d) the oxidation ditch can run the most efficient removal of pollutants. For COD, ammonia nitrogen and oil removal efficiency rate is 91.8%,96.0% and 91.9%. the pH has different effects for COD, ammonia nitrogen and oil, the best COD removal is in pH 7 to 8, the optimum pH to remove ammonia is in 7.5 to 8.5. the optimum pH to remove the oil is in the 6.5-7.5. the optimum pH to remove COD, ammonia and oil at the same time is in 7.5; when the Sludge return ratio 90%-130% for COD, ammonia nitrogen and oil, It runs most efficient and the removal rate are 87.9%-94.6%; 89.6%-97.3% and 88.8%-92.7%; When the external carbon source (COD) increases from Omg/L to 400mg/L, the corresponding removal of oil increases from 76.3% to 95.8%; Through the impact load test shows that oxidation ditch by the COD and oil load can still quickly return to its original level after the treatment for oily waste water, indicating the strong resistance to shock load. |
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