page 310 |
Previous | 1 of 10 | Next |
|
|
Loading content ...
Section 5. REFINERY WASTES STARTUP AND OPERATION OF A REFINERY ACTIVATED SLUDGE PLANT A. J. Reitano, Jr., Staff Engineer Exxon Research and Engineering Company Florham Park, New Jersey 07932 The activated sludge process continues to be the preferred secondary wastewater treatment method for removal of biodegradable, soluble, organic matter. The mode of operation consists of contacting the substrate organic matter with a large population of viable microorganisms in an aerobic environment. The development of this mixed liquor population during startup of activated sludge plants can sometimes prove to be a laborious task affected by the seeding method employed. Factors which influence the microbial growth rate and, therefore, the length of time required to attain an acclimated mixed liquor culture, are temperature, organic loading, dissolved oxygen concentration and nutrient levels. This chapter reports on the startup of an activated sludge plant using enriched dried cultures at an Exxon refinery. Performance data during the startup period and typical operating data after attainment of a stable mixed liquor are included. The effect of phenol loadings of up to 200 mg/l on the activated sludge operation three weeks after wastewater in is reported. Operator training for the activated sludge plant is also discussed. TREATMENT PLANT DESCRIPTION The activated sludge plant and upstream equalization tankage commissioned in 1979 were the second phase of wastewater treatment facilities constructed at the refinery. In 1975 advanced primary treatment equipment was installed for oil removal from gravity separator effluent as part of the phase one facilities. The refinery wastewater treatment plant is shown schematically in Figure 1. The total refinery wastewater flows by gravity to a bank of API separators for primary oil and suspended solids removal. The separator effluent is pumped to a 20,000-m tank for flow and contaminant equalization for downstream equipment. This tank provides a hydraulic retention time of 19.5 hours at maximum flow and 28.5 hours at average flow. The equalized effluent flows by gravity to a 20-m-diameter dissolved air flotation (DAF) unit for additional oil removal. The DAF effluent flows by gravity to the activated sludge plant which was designed similar to a step feed mode. The aeration basin contains four inlet points for the feed along the length of the basin. The feed lines are turned up under each of four 2-speed, floating, mechanical aerators. The recycle sludge from the clarifier can enter the basin at three positions; between the back wall and the first aerator, the first and second aerators, and the second and third aerators. Each feed and recycle line entering the basin contains an annu- bar station for measuring flow to split the feed or recycle as desired. Dissolved oxygen and Figure 1. Wastewater treatment plant schematic. 310
Object Description
Purdue Identification Number | ETRIWC198132 |
Title | Startup and operation of a refinery activated sludge plant |
Author | Reitano, A. J. |
Date of Original | 1981 |
Conference Title | Proceedings of the 36th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,32118 |
Extent of Original | p. 310-319 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Date Digitized | 2009-07-07 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 310 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | Section 5. REFINERY WASTES STARTUP AND OPERATION OF A REFINERY ACTIVATED SLUDGE PLANT A. J. Reitano, Jr., Staff Engineer Exxon Research and Engineering Company Florham Park, New Jersey 07932 The activated sludge process continues to be the preferred secondary wastewater treatment method for removal of biodegradable, soluble, organic matter. The mode of operation consists of contacting the substrate organic matter with a large population of viable microorganisms in an aerobic environment. The development of this mixed liquor population during startup of activated sludge plants can sometimes prove to be a laborious task affected by the seeding method employed. Factors which influence the microbial growth rate and, therefore, the length of time required to attain an acclimated mixed liquor culture, are temperature, organic loading, dissolved oxygen concentration and nutrient levels. This chapter reports on the startup of an activated sludge plant using enriched dried cultures at an Exxon refinery. Performance data during the startup period and typical operating data after attainment of a stable mixed liquor are included. The effect of phenol loadings of up to 200 mg/l on the activated sludge operation three weeks after wastewater in is reported. Operator training for the activated sludge plant is also discussed. TREATMENT PLANT DESCRIPTION The activated sludge plant and upstream equalization tankage commissioned in 1979 were the second phase of wastewater treatment facilities constructed at the refinery. In 1975 advanced primary treatment equipment was installed for oil removal from gravity separator effluent as part of the phase one facilities. The refinery wastewater treatment plant is shown schematically in Figure 1. The total refinery wastewater flows by gravity to a bank of API separators for primary oil and suspended solids removal. The separator effluent is pumped to a 20,000-m tank for flow and contaminant equalization for downstream equipment. This tank provides a hydraulic retention time of 19.5 hours at maximum flow and 28.5 hours at average flow. The equalized effluent flows by gravity to a 20-m-diameter dissolved air flotation (DAF) unit for additional oil removal. The DAF effluent flows by gravity to the activated sludge plant which was designed similar to a step feed mode. The aeration basin contains four inlet points for the feed along the length of the basin. The feed lines are turned up under each of four 2-speed, floating, mechanical aerators. The recycle sludge from the clarifier can enter the basin at three positions; between the back wall and the first aerator, the first and second aerators, and the second and third aerators. Each feed and recycle line entering the basin contains an annu- bar station for measuring flow to split the feed or recycle as desired. Dissolved oxygen and Figure 1. Wastewater treatment plant schematic. 310 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Tags
Comments
Post a Comment for page 310