Dissertation > Excellent graduate degree dissertation topics show

The Membrane Bioreactor(MBR) Coupled with Sludge Fenton Oxidation Process for Coking Wastewater Treatment and Sludge Reduction

Author: HeMingHe
Tutor: WeiChaoHai
School: South China University of Technology
Course: Environmental Engineering
Keywords: Membrane bioreactor (MBR) Fenton oxidation Sludge Reduction Coking Wastewater Biological denitrification
CLC: X703
Type: PhD thesis
Year: 2010
Downloads: 558
Quote: 1
Read: Download Dissertation

Abstract


Basic national conditions of China's annual total wastewater discharge and wastewater treatment requirements continue to increase, in order to alleviate the impact of wastewater on the environment, it is necessary to study the development of efficient wastewater treatment technology. The biological wastewater treatment process generates a lot of surplus sludge treatment and disposal problems will also increasingly grim. In this paper, efficient degradation of coking wastewater and sludge reduction as the starting point of the study, a novel fluidized bed and membrane module membrane bioreactor (MBR) as the core biological treatment unit, Fenton oxidation technology of excess sludge crack, the MBR with sludge Fenton oxidation process coupled investigated the degradation of performance of coking wastewater, and focus on the coupling process sludge reduction process. MBR and the MBR with sludge Fenton oxidation combined process of coking wastewater treatment experiments found that the stable operation of the MBR and MBR with sludge Fenton oxidation combined process of coking wastewater treatment efficiency are high, the water quality is good, but need to MBR mud continuously maintain stable operation, and the combined process can be achieved waste water and sludge at the same time, the sludge yield (0.0023 g · MLVSS · (g · COD) -1) is close to zero, and during long time operation of sludge activity substantially not reduced. By simultaneous nitrification and denitrification of the MBR does not affect the nitrification, due to lower DO favor simultaneous nitrification - Anti-nitrification efficiency. When the The MBR sludge concentration control in 7800 - 8200 mg · L-1, DO of about 0.8 mg · L-1 the MBR of TN average removal rate of 91.9%. In addition, higher C / N and an appropriate increase in the F / M conducive simultaneous nitrification - Anti-nitrification efficiency. Nitrification and denitrification processes through static experiments on MBR parse found at high substrate concentration, the microbes preferentially degraded organic matter mainly accelerated with the decrease of the substrate concentration, nitrification and denitrification, and from the theory on the same time the possibility of mineralization and nitrification in the MBR. Also found that the denitrification reaction rate limiting step in the process of simultaneous nitrification - denitrification. Fenton oxidation sequencing batch experimental findings Fenton oxidation of sludge crack process is divided into two stages, the first stage activated sludge cells crack, and for the sludge concentration in the mixture of sludge crack mechanism rapid decline and a rapid increase in dissolved organic matter; mainly the second stage of the dissolved organic matter in the sludge mixture oxide declining performance increased to the maximum mixture of dissolved organic matter. Obtain suitable conditions at room temperature sludge crack: pH = 3.0, H2O2 dosage of 8000 mg L-1 of H2O2 / Fe2 = 40: 1. Reaction time is 90 min. MBR (reference system) and MBR with sludge Fenton oxidation combined process (combination system) run continuously found reference system with a combination of organic degradation efficiency were higher. Due to the Fenton oxidation sludge mixture reflux increases the volume of the combined system load, the combination of COD and TN removal loading is higher than the reference system, in which the combined system of the TN removal load is 11.3% higher than the reference system; reference system and the combined system of continuous running average apparent sludge yield of 0.15 g · MLSS · (g · COD) -1 and 0.006 g · the MLSS · (g · COD) -1. Shows that part of the sludge Fenton oxidation can effectively reduce excess sludge generation back to the MBR system while improving the efficiency of biological nitrogen removal. Found through the study of membrane flux changes quickly about a 40% reduction in intimal flux in the system began to run 7 d, slowed down after the change of the membrane flux, the the membrane modules film through running low sludge concentration The amount is slightly higher than in the high sludge concentration, COD concentration in the mixture is the main factor to affect the membrane flux. The analysis of the mechanism of membrane fouling, with the corresponding chemical cleaning method of cleaning the film, after repeated washing 5 times can still be recovered in more than 50% of the loss of membrane flux.

Related Dissertations

  1. Coking wastewater on various stages of processing and toxicity of corn embryo,X173;S513
  2. Synthesis of Oreganic Molybedenum and Exploration of New Methods of Oxidative Stability,TE624.8
  3. Study on the Pretreatment of Azithromycin Wastewater by Combined Coagulation-Fenton-like Oxidation Process,X787
  4. Struvite precipitation combined with Fenton oxidation treatment of landfill leachate studies,X703
  5. Study on the Sludge Reduction by Electrochemistry,X703.1
  6. Research on a New Reactor for Sludge Reduction Using Oligochaete Worm with Simultaneous Nitrification and Denitrification Process,X703
  7. Selection the Sewage Treatment Combined Sessile Worm Reactor and the Performance of the Combined Process,X703.1
  8. Study on Effect of Sludge Reduction by Daphnia,X703
  9. Study on Microbial Agent Used to Wastewater Treatment and Sludge Reduction,X703
  10. Ultrasound/Ozone-Cryptic Growth Sludge Reduction Technology,X703
  11. Research on the Excess Sludge Reduction by the Coordination of Ultrasonic/Ozonation Pretreatment and Membrane Reactor,X703
  12. Study on SBR-Sessile Worm Reactor Combined Process for Sludge Reduction,X703
  13. Ultrasound Lysis-Cryptic Growth Sludge Reduction Technology,X703
  14. The Research on Sludge Reduction Performance of Limnodrilus Hoffmeisteri Attachment Type Reactor,X703
  15. Study on Sewage Water Reuse Process and Integrative Equipment in Residential District,X703
  16. Study of Circulatory Sludge Reduction Reactor of Anaerobic/oxygen Limiting with Arc Guide Plate,X703
  17. Upgrading of Anaerobic Sludge Hydrolysis Acidification-Aerobic Reduction by Alkali and Ultrasonic Pretreatment,X703
  18. Study on the Thermodynamic Properties and the Mechanism of Sludge Reduction of A+OSA Combination Process,X703
  19. Effective Microorganism Applied in Reduction of Septic Tank Sludge,X703
  20. ClO_2 coupled ultrasonic cell lysis broken sewage treatment systems Sludge Reduction Technology,X703
  21. Study on Struvite Recovery in Low Concentration of Nitrogen and Phosphorus in Sludge Reduction,X703

CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
© 2012 www.DissertationTopic.Net  Mobile