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Treating Coking Plant Wastewater with Simultaneous Nitrification and Denitrification Technique

Author: YangKun
Tutor: YuZhaoXiang
School: Tongji University
Course: Applied Chemistry
Keywords: Coking Wastewater Nitrification and denitrification Orthogonal test Dynamics Biofacies
CLC: X784
Type: Master's thesis
Year: 2006
Downloads: 50
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Abstract


In view of the coking wastewater containing high concentrations of organic matter and ammonia caused significant harm to the environment, which further removal of organic matter and biological nitrogen removal has increasingly attracted attention. Biofilm system of simultaneous nitrification and denitrification of the trial treatment of coking wastewater, some of the factors that influence the effect of the system processing biological denitrification process to coking wastewater treatment similar process to provide some reference. Firstly, using orthogonal test biofilm simultaneous nitrification and denitrification systems, dissolved oxygen, residence time, pH and other factors on the degradation of organic matter and biological nitrogen removal from degradation determine the Best COD (chemical oxygen demand) process control conditions. The results show that the most influential factors: DO (dissolved oxygen) is the process under different levels of DO conditions, system COD removal efficiency range of 58.61%. Followed by the pH> COD load> HRT> Comprehensive error> NH 3 -N load. Thus we arrive at the optimum conditions: HRT = 44.1h; the DO = 3.5 to 4.0mg / L; pH = 8. Analysis of ammonia influencing factors: HRT is not less than 40h ammonia nitrogen removal rate of up to about 95%, the effluent ammonia concentration of less than 5 mg / L, and ammonia can be almost completely converted to nitrate, and denitrification. can achieve better nitrogen removal: DO 5.5mg / L nitration completely, and total nitrogen mass concentration decreased, showed that only happened at this stage simultaneous nitrification and denitrification; carbon sources affect the quality and quantity denitrification effect of key factors, if you do not join methanol, denitrification rate is very low, denitrification rate is greatly increased by the addition of methanol; pH value is important controlling factors in the denitrification process, micro-organisms to survive only in a certain pH between 7.5 to 8.5 is most appropriate. The system dynamics studies show: When the influent COD concentration of 1500mg / L about half of the organic removal rate constant for 553.107mg / L, the unit volume filler organics removal rate 1667mg / m 2 < / sup>. h; influent ammonia concentration of 300mg / L or so, the unit volume of packing maximum removal rate of ammonia 5.7471mg / m 2 . h, while the the nitrite bacteria ammonia nitrogen oxide saturation constant 2.9954mg / L. Biofacies: the polymicrobial biofilm growth, a large number of heterotrophic microorganisms can make better use of the organic carbon source in wastewater COD is rapidly metabolized under aerobic conditions. Formed inside the anaerobic environment denitrification microorganisms have suitable metabolic environment and may use pre-stored in the matrix for denitrification.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Chemical industry,waste disposal and comprehensive utilization > Fuel chemical industry
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