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Study on Hybrid Anaerobic-Chemical Precipitation-A/O Process in Treating Organic Amine Wastewater

Author: ChenMinDong
Tutor: ZhangSheng
School: Hebei University of Engineering
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Hybrid Anaerobic Reactor Chemical precipitation A / O process Organic amine wastewater
CLC: X703
Type: Master's thesis
Year: 2008
Downloads: 35
Quote: 0
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Abstract


Organic amine wastewater Jiangshan Chemical emissions TN content, concentration, and a certain amount of toxic and hazardous substances, the existing sewage treatment system there is a limited amount of processing, the water is not up to running costs of the disadvantages. This topic composite anaerobic - chemical precipitation-A / O combined process to transform the original system, each unit of the organic amine wastewater treatment effect was studied under laboratory conditions to determine paragraphs suitable operating conditions and operating parameters, and the process for the transformation of the actual project. Train as the pretreatment composite anaerobic reactor in room temperature 73d granular sludge to a smooth start. Best HRT = 1.85d, the best volume load of 1.543 ~ 2.701kgCOD / (m 3 · d), COD removal can be maintained at about 50%, the organic amine conversion rate maintained at above 60%. After anaerobic digestion of raw water B / C value increased from 0.263 to 0.362, to provide the conditions for further biochemical processing. Chemical precipitation to remove ammonia MgCl 2 · 6H 2 O with the of Na 2 HPO 4 · 12H 2 O as a precipitating agent, investigated the pH, n (P): n (N) n (Mg): n (N) and the initial concentration of ammonia nitrogen ammonia removal efficiency of phosphate utilization impact through multiple indicator orthogonal test and single-factor optimization testing to determine the optimum pH = 9.5, n (Mg 2 ): n (NH 4 ): n (PO 4 3 - ) = 1.2:1:1.1, ammonia removal efficiency of 90.81%, 97.34% phosphate utilization residual phosphorus content of 27.67mg / L. A / O process as a follow-up treatment, the best operating conditions: pH control in the 7 to 8, Section A DO <0.5mg / L, O segment DO> 4.0mg / L, the temperature is maintained at 25 ° C. Optimum operating parameters: HRT = 30h, where A segment HRT = 7.5h O segment HRT = 22.5h, SRT = 30d within reflux ratio R = 3.0. The size of the actual engineering design for the 1000m 3 / d composite anaerobic pond design volume load 2kgCOD / (m 3 · d), HRT = 44.5h filler layer and pollution mud layer height ratio of 5:2. Pre-aeration tank the preceding rely the aeration blown off in addition to ammonia and pollutants after the segment as aeration flocculator design flocculation time of 20min. A / O pool total HRT 32h, A pool HRT 8h the O pool HRT 24h. Within a reflux ratio of 300%, the sludge recycle ratio is 50%. Works normal operation After 100d of about debugging. In influent COD Cr , the average of 3973mg / L, TN average of 810mg / L, the combined system COD removal efficiency of 90.8%, BOD removal rate was 97.04%, and the average effluent ammonia concentration of less than 50 mg / l. In addition, the removal of oil, volatile phenol, sulfide, cyanide effect is very ideal. This fully proves that the composite anaerobic - chemical precipitation-A / O combined process suitable for organic amine wastewater treatment, and provides a strong reference for other similar wastewater treatment, the promotional value.

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