page 572 |
Previous | 1 of 11 | Next |
|
|
Loading content ...
Use of Styrofoam for Trickling Filter Covers J. P. SHE AH AN, Engineer Plastics Development and Service The Dow Chemical Company Midland, Michigan INTRODUCTION Population expansion, community and industrial growth are outrunning the nation's water supply. In consequence, problems of liquid waste control, water conservation, and pollution prevention are taking on new urgency. This urgency is reflected in new legislation at all levels -- national, state, municipal. Many waste disposal techniques are available to reduce pollution. Some are diminishing in acceptability, others are not practical in all parts of the nation. Disposal of raw waste in rivers and lakes is being discouraged or prohibited in most states. Dilution runs the risk of producing odors or objectionable tastes in water supplies. Ocean disposal is limited to industries and cities with easy access to the seacoasts. Ponding is practical only if sufficient surface area is available. However, it is often used in conjunction with other techniques, although evaporation of large liquid wastes is acceptable only in certain isolated areas. The greatest opportunities for economic practical solutions to liquid waste problems rest in new techniques and methods. Biological Oxidation is effective for treating most wastes. The trickling filter principle is used to support bacterial decomposition of suspended and dissolved wastes. It may require preliminary and secondary flocculation and settling. HISTORY The Dow Chemical Company through the Dow Industrial Services Division and the Waste Water Treatment Groups have long been active in this area. Recently, the plastics department has developed a method of enclosing space with a technique called "Spiral Generation" --an ingeneous system which can form singly or doubly curved structures of rigid plastic foam. This concept is seen as a means of economically justifying the use of covers over trickling filters to eliminate problems ranging from freeze-up to acceptable appearance. The Spiral Generation method involves use of a specially designed machine which bends, places, and bonds pieces of plastic foam together to a predetermined shape. A variety of shapes can be produced by modifying and "programming" the machine. In forming a dome the machine head is mounted on a boom which swings around a pivot, like the hands of a clock, laying and bonding layer upon layer of foam board in a rising spherical form. The Waste Water Treatment Plant at Midland, Michigan, where Dow is located, provided an excellent facility for testing the installation and use of covered trickling filters. The plant has two identical parallel systems allowing a performance comparison to be made by covering the primary and secondary trickling filters of one system. Dow was interested in developing the comparative data to determine if covers for trickling filters are justified on an efficiency basis and the - 572 -
Object Description
Purdue Identification Number | ETRIWC196542 |
Title | Use of styrofoam for trickling filter covers |
Author | Sheahan, J. P. |
Date of Original | 1965 |
Conference Title | Proceedings of the twentieth Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,12162 |
Extent of Original | p. 572-582 |
Series |
Engineering extension series no. 118 Engineering bulletin v. 49, no. 4 |
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 | 2009-05-19 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 572 |
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 | Use of Styrofoam for Trickling Filter Covers J. P. SHE AH AN, Engineer Plastics Development and Service The Dow Chemical Company Midland, Michigan INTRODUCTION Population expansion, community and industrial growth are outrunning the nation's water supply. In consequence, problems of liquid waste control, water conservation, and pollution prevention are taking on new urgency. This urgency is reflected in new legislation at all levels -- national, state, municipal. Many waste disposal techniques are available to reduce pollution. Some are diminishing in acceptability, others are not practical in all parts of the nation. Disposal of raw waste in rivers and lakes is being discouraged or prohibited in most states. Dilution runs the risk of producing odors or objectionable tastes in water supplies. Ocean disposal is limited to industries and cities with easy access to the seacoasts. Ponding is practical only if sufficient surface area is available. However, it is often used in conjunction with other techniques, although evaporation of large liquid wastes is acceptable only in certain isolated areas. The greatest opportunities for economic practical solutions to liquid waste problems rest in new techniques and methods. Biological Oxidation is effective for treating most wastes. The trickling filter principle is used to support bacterial decomposition of suspended and dissolved wastes. It may require preliminary and secondary flocculation and settling. HISTORY The Dow Chemical Company through the Dow Industrial Services Division and the Waste Water Treatment Groups have long been active in this area. Recently, the plastics department has developed a method of enclosing space with a technique called "Spiral Generation" --an ingeneous system which can form singly or doubly curved structures of rigid plastic foam. This concept is seen as a means of economically justifying the use of covers over trickling filters to eliminate problems ranging from freeze-up to acceptable appearance. The Spiral Generation method involves use of a specially designed machine which bends, places, and bonds pieces of plastic foam together to a predetermined shape. A variety of shapes can be produced by modifying and "programming" the machine. In forming a dome the machine head is mounted on a boom which swings around a pivot, like the hands of a clock, laying and bonding layer upon layer of foam board in a rising spherical form. The Waste Water Treatment Plant at Midland, Michigan, where Dow is located, provided an excellent facility for testing the installation and use of covered trickling filters. The plant has two identical parallel systems allowing a performance comparison to be made by covering the primary and secondary trickling filters of one system. Dow was interested in developing the comparative data to determine if covers for trickling filters are justified on an efficiency basis and the - 572 - |
Resolution | 300 ppi |
Color Depth | 8 bit |
Tags
Comments
Post a Comment for page 572