Antibiotics In Anaerobic Biological Treatment Of Industrial Waste Water Technology Research

The antibiotic wastewater treatment project in Zhumadian Huazhong Zhengda Co.Ltd was studied in this paper. The process technics, characteristics of antibiotic wastewater and the general situation of treatment of antibiotic wastewater were simply discussed, and the theory and technology of anaerobic fermentation, the Internal Circulation Reactor were simple analysed through quantities of literature. The paper mainly studied the start-up performance of the full-scale IC reactors treating high strength antibiotic wastewater. At the same time the paper also compared the effects of UASB, UBF and IC in treating antibiotic wastewater.Basing on the connection of the organism degradation and cellular compose in the IC, an influent model on organic loads M_n=(1+k)ⁿ-1 M₁ and space loads N_n=(1+k)ⁿ-1 N₁ were established. The project of influent wastewater were also presented. The large percentage of inoculation sludge came from anaerobic dehydration sludge of domestic wastewater treatment plant of Zhengzhou city and small amounts of inoculation sludge were granule sludge of UASB from a monosodium glutamate factory in Zhoukou city . At the beginning of the start-up, the sludge concentration of IC were 7.57mg/L.The start-up of the IC reactor lasted 6 months from the beginning of 2004 to June. It has experience two stages: (1) we explored low strength influent wastewater and maintain the wastewater strength, at the same time improved the organic loads gradually by increasing the water quantity up to the design capacity. (2) kept the quantity of the wastewater, and improve the wastewater strength till the design strength. At the first stage, the COD concentration of the feed wastewater was approximately between 2000⁵000mg/L.We fed the wastewater at 8, 12, 16, 20, 24 o'clock everyday intermittently. If the effluent COD, VFA, ALK SS concentration and temperature, pH value , the condition of methane production are right, we can improve the quantity of feed wastewater in accord with the project. In April 2005, the IC reactor has reached the design influent water quantity of 500m³/d. At the second stage, we maintained the influent quantity of 500m³/d, and improved the organic loads by increasing the influent strength. In the middle of May, the IC reactor has reached the design influent strength. At that time, the IC reactor's organic loads has reached 5100kgCOD/d, and the space loads was 5.1kgCOD/m³.d, while the COD removal exceeded 80%. A large amount of granular sludge has been cultivated in the!C reacto1 All those indicate the IC reactor lias been started up successfully.According to the operation conditions of the two wastewater treatment process in Jui ^ August ^ September and November , we compared the dispose effects of IC UBF and UASB in treating antibiotic wastewater. The results indicated that when the organic loads of IC was 5.5kgCOD/(m3d), it's removal rate of COD was 84.36%, when UBF's was 3.5kgCOD/(m3d), it's removal rate of COD was 75.04%, when UASB's was 3.0kgCOD/(m3d), it's removal rate of COD was 71. 4%, and the IC reactor has significant advances in treating antibiotic wastewater. Comparing with UBF and UASB, IC reactor run more stably and was better in resisting abnormal impact of wastewater. The Internal Circulation Reactor can be operated at high space loads rate and high liquid up-flow velocity with low investment cost and space occupation, it has a promising future in wastewater disposal field.