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Flyash as a Filtering Aid for Dewatering Industrial Waste Plant Sludge FRED W. MOEHLE, CHIEF POWER ENGINEER Uniroyal, Incorporated Mishawaka, Indiana 46544 INTRODUCTION Dewatering industrial waste plant sludge using flyash as a filtering aid has proven successful at the UNIROYAL, Inc. U. S. Rubber plant located in Mishawaka, Indiana. This treatment plant located on the St. Joseph River was put into operation in December 1964. It is designed to handle only contaminated industrial waste; all sanitary waste is discharged to the city sewer system. To fully understand where the sludge comes from, how it is collected and how the dewatering is accomplished, it might be well to briefly describe the entire waste treatment plant operation. Briefly stated this facility can be considered a filtration plant accomplishing its objective by means of chemical filtration as opposed to mechanical filtration. The industrial waste upon entering the plant is deposited in an equalizing basin. From the equalizing basin the waste is pumped to a weir box which is at the highest elevation in the treatment process. The waste flow through the clarifying process, therefore, is accomplished by means of gravity. From the weir box the waste water flows through the first stage mixing tank where Ferri-Floc (ferric sulfate), a flocculating agent, is added. The waste then flows through the second stage mixer where a small amount of Separan, a flocculating aid, is added. Passing from this tank the waste water enters the first stage flocculator where a high speed mixer brings the Ferri-Floc into intimate contact with the various waste particles entrained in the water. From the first stage flocculator, the water enters the clariflocculator which in effect is the second stage flocculator located in the center of the clarifier. In the second stage flocculator, a slow moving mixer allows the floe to form and precipitate down through the bottom of the flocculator together with the water in which it is entertained. This flocculation process appears much like the curdling of near sour milk when poured into a cup of hot black coffee. The clear water rises into the clarifier portion and is allowed to flow over a weir plate around the periphery of the clarifier. The floe remains at the bottom of the tank. The settled floe is hereafter referred to as sludge. The sludge build-up in the bottom of the clariflocculator is periodically allowed to flow or is "blown-down" into a sludge collecting tank. The "blow-down" is set on a time basis by the plant operator. The operator decides on the time setting after daily checking the level of the sludge blanket by means of a sampling bottle. It is the purpose of this paper to expound on the method of dewatering this sludge using flyash as a filtering aid. SLUDGE DEWATERING Equipment In the process of dewatering the sludge, six major pieces of equipment are involved (Figure 1). - 429 -
Object Description
Purdue Identification Number | ETRIWC196739 |
Title | Flyash as a filtering aid for dewatering industrial waste plant sludge |
Author | Moehle, Fred W. |
Date of Original | 1967 |
Conference Title | Proceedings of the 22nd Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,14179 |
Extent of Original | p. 429-440 |
Series |
Engineering extension series no. 129 Engineering bulletin v. 52, no. 3 |
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 | 2009-05-20 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 429 |
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 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | Flyash as a Filtering Aid for Dewatering Industrial Waste Plant Sludge FRED W. MOEHLE, CHIEF POWER ENGINEER Uniroyal, Incorporated Mishawaka, Indiana 46544 INTRODUCTION Dewatering industrial waste plant sludge using flyash as a filtering aid has proven successful at the UNIROYAL, Inc. U. S. Rubber plant located in Mishawaka, Indiana. This treatment plant located on the St. Joseph River was put into operation in December 1964. It is designed to handle only contaminated industrial waste; all sanitary waste is discharged to the city sewer system. To fully understand where the sludge comes from, how it is collected and how the dewatering is accomplished, it might be well to briefly describe the entire waste treatment plant operation. Briefly stated this facility can be considered a filtration plant accomplishing its objective by means of chemical filtration as opposed to mechanical filtration. The industrial waste upon entering the plant is deposited in an equalizing basin. From the equalizing basin the waste is pumped to a weir box which is at the highest elevation in the treatment process. The waste flow through the clarifying process, therefore, is accomplished by means of gravity. From the weir box the waste water flows through the first stage mixing tank where Ferri-Floc (ferric sulfate), a flocculating agent, is added. The waste then flows through the second stage mixer where a small amount of Separan, a flocculating aid, is added. Passing from this tank the waste water enters the first stage flocculator where a high speed mixer brings the Ferri-Floc into intimate contact with the various waste particles entrained in the water. From the first stage flocculator, the water enters the clariflocculator which in effect is the second stage flocculator located in the center of the clarifier. In the second stage flocculator, a slow moving mixer allows the floe to form and precipitate down through the bottom of the flocculator together with the water in which it is entertained. This flocculation process appears much like the curdling of near sour milk when poured into a cup of hot black coffee. The clear water rises into the clarifier portion and is allowed to flow over a weir plate around the periphery of the clarifier. The floe remains at the bottom of the tank. The settled floe is hereafter referred to as sludge. The sludge build-up in the bottom of the clariflocculator is periodically allowed to flow or is "blown-down" into a sludge collecting tank. The "blow-down" is set on a time basis by the plant operator. The operator decides on the time setting after daily checking the level of the sludge blanket by means of a sampling bottle. It is the purpose of this paper to expound on the method of dewatering this sludge using flyash as a filtering aid. SLUDGE DEWATERING Equipment In the process of dewatering the sludge, six major pieces of equipment are involved (Figure 1). - 429 - |
Resolution | 300 ppi |
Color Depth | 8 bit |
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