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Study on the Key Problems of Flat-sheet Membrane Bioreactor for Engineering Application

Author: WangXu
Tutor: WuZhiChao
School: Tongji University
Course: Environmental Engineering
Keywords: Film - bioreactor Flat membrane Sewage treatment Engineering applications
CLC: X703.3
Type: Master's thesis
Year: 2008
Downloads: 120
Quote: 0
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Abstract


Film - bioreactor as a new, efficient wastewater treatment technology has many advantages unmatched by conventional biological treatment processes, and in recent years has been widely used in municipal sewage and industrial wastewater treatment. At present, the international film - bioreactor market mainly flat membrane - the bioreactor and the hollow fiber membrane - two bioreactor. Flat membrane and hollow fiber membranes compared to hydraulic conditions easy to control, high-throughput, strong anti-pollution and cleaning easy to replace, and so on, high-throughput and stable operation can be maintained in the higher sludge concentration conditions. Of flat membrane - bioreactor, however, has lagged far behind, and the tablet film - the application of the bioreactor is far less than the proportion of hollow fiber membrane - bioreactor, and in the international film market - bioreactor, flat membrane - the application of the bioreactor ratio reached 68% (as of 2006). Therefore, the increase of the flat membrane - bioreactor research and development efforts, to build China's film - bioreactor reasonable structure and layout, and promote the film - the balanced development of the bioreactor of film - bioreactor technology development and its is of great significance in the application of water pollution control and water resource. In this thesis, by means of a 400m 3 / d scale flat membrane - the bioreactor and sets small test film - bioreactor, tracking to study flat membrane - bioreactor engineering applications problem. The conclusion of the study has some reference and the reference value of the flat membrane - bioreactor design and operation of engineering applications. Construction 400m 3 / d of flat membrane - bioreactor water reuse projects, and running for a year and a half. The project water reached the city sewage water reuse - miscellaneous drainage water quality standards GB18920-2002 \water cost savings of 159,400 yuan; tons of water and energy consumption of the project, the cost of cleaning reached the same level of international similar products, film price is a great advantage. Long-term tracking of flat membrane - bioreactor effluent, regardless of the water changes, the effluent COD, ammonia nitrogen and SS are more stable; kinetic coefficients calculated sludge that, the project net sludge yield coefficient Y = 0.225kgMLVSS/kgCOD the endogenous metabolic coefficient K d as 0.0045 d , -1 . Developed a membrane module side, automatic on-line cleaning equipment, cleaning aeration tube, emergency processing system engineering applications in key technologies, and has been successfully applied in the engineering, greatly improving the project the stable operation of the ability to facilitate the operation and management. Through long-term follow-up film on pollution law found in the flux of 20L / m 2 ยท h, the normal operation of the TMP does not exceed 20 kPa TMP growth to 30kPa online chemical cleaning; handling chemical level to enhance the treatment of urban sewage, the cleaning cycle of the flat membrane sewage than Processing ordinary life is short; vertical frame for the type of pump suction, the upper and lower bracket flux ratio of 1.15:1 conditions, can be achieved bracket TMP growth is basically the same. Confluence of typical urban sewage, the average COD / TN 8.0, AO film - bioreactor effluent COD, ammonia nitrogen and TN removal rate can reach 97%, 99% and 77.6%, the water can be stabilized to achieve \plant emission standard GB18918-2002 \significantly improved TN removal rate, while in the the anoxic HRT GT; 3h conditions, increased the anoxic HRT for nitrogen removal; TN removal can significantly increase the reflux ratio r LT; 100% under the conditions of increasing r. in r GT; 100% conditions, an increase in r TN removal had no significant effect.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Equipment
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