Portable stack sampler measures stack gases and solids at low cost
letters
Water quality standards
DEARSIR: In your article “Approval of Standards Sets Pace for Protection of US. Water Quality” (ES&T, February 1969, page 120) there is an error in a table on page 121. The table implies that the nondegradation statement made by the District of Columbia was not acceptable to the Federal Government. In fact, the D. C. water quality standards, including nondegradation language, were fully approved by the Secretary of the Interior on January 17, 1969. I note, however, that your table had a January 20 cutoff date; this date is so close to January 17 that the reason for the error is understandable. Arnold Speiser Chief, Water Quality Control Division Department o f Public Health Government of the District of Columbia Washington, D . C. 20001
Industrial kidney process
Now you can easily-and at low cost-collect and measure solids, mists and gases directly from your stacks with Research Appliance’s new portable Staksamplr.TM Developed and used successfully by the National Center for Air Pollution Control, this new sampler provides isokinetic collectioR of pollutants from most chemical and combustion processes, With a trained two-man crew, i t can provide three samples per eight-hour day.
Research Appliance Company Allison Park, Pennsylvania 15101 Area 4 12-96 1-0588
No. 57 on Readers’ Service Card 506 Environmental Science & Technology Circle
DEARSIR: The “Currents” item in the March 1969 issue of ENVIRONMENTAL SCIENCE & TECHNOLOGY (page 203) describing evaluation of reverse osmosis for treating dilute pulp and paper wastes incorrectly stated that the costs of this project last year amounted to $690,530. That figure covers the total cost for the entire grant which will extend through six field scale demonstrations on different wastes at different mills over a two-year period. Also included is another year of preliminary laboratory and pilot scale studies ahead of the design, construction, and operation of the 50,000- to 100,000-gallonper-day field unit. T h e field unit. mounted on an over-the-road trailer, was built under contract at a cost of $137,175 and there are two pilot scale units ( 1000-5000 gallons per day) used for three slix-month periods ahead (Continued on page 508)
How much will odor control
There are significant costs-beyond equipment alone-for fume and odor control systems. Engineering; installation; operation; maintenance. Most of Air Preheater's Cor-Pak@ direct-flame fume incinerator models are shipped completely assembledincluding insulation, burner components and controls. Installation costs w e down to an absolute minimum
requiring only electrical, fuel and ducting after the unit is set in place. What's more, our modular concept permits almost unlimited arrangement flexibility. When it to Operating and maintenance costs, a Cor-Pak fume incinerator has other important ecoC i r c l e No. 55 on Readers' Service Card
nomic advantages. Integral heat recovery units are selected to meet established payout time and can cut fuel costs by as much as 80%. In operation, a Cor-Pak system literally runs itself year after year with maintenance costs close to zero. Behind all this is Air Preheater's technological know-how; applied research facilities including on-site testing; engineering and manufacturing back-up; and leadership in the state Of the art. All are factors in realistically evaluating the true cost Of fume and Odor control. For of the dollar-saving facts, call or write today.
THE AIR PREHEATER COMPANY, INC., Wellsville New York 14895 A Subsidiary of Combustion Engineerlng
Volume 3, Number 6, June 1969 507
ATLAS GAS ANALYZERS
of the large unit. Your report was based on a press release describing completion of the first of the six field demonstrations. Averill J. Wiley Technical Director Pulp Manufacturing Research League, Inc. Appleton, Wis. 5491 1
THE N E W INDUSTRY STANDARD FOR AIR POLLUTION M O N I T O R I N G
so2
so2
Specific Colorimetric
a n d Reducing Agents lodometric
Specific Colorimetric
a n d Total Oxidants lodometric
NO Specific Colorimetric
Aldehydes Specific Colorimetric
Specific Colorimetric
DEARSIR: In your March 1969 Current, “Paper makers evaluate portable reverse osmosis unit,” the copy implies that the Pulp Manufacturers Research League, Inc., alone developed the reverse osmosis or industrial kidney process. This implication is not entirely correct. The system, in its entirety, was manufactured and assembled by Havens International in San Diego, Calif. The reverse osmosis modules used are a proprietary product of Havens, and our firm hzs spent more than $4 million and seven years in their development. The people at Pulp Manufacturers Research League have conducted several years of laboratory and pilot-scale work with the modules and furnished the technical and operating data necessary to permit the design and construction of the larger mobile system. Fred B. Leonard Vice President, Marketing Havens International Sari Diego, Calif. 92123 Educators’ vital role
Now approved and recommended by many governmental agencies and private industry, Atlas analyzers are available for use with fixed, mobile and stack installations. Schulze patented chemical methods of analysis. Extremely accurate, best available sensitivity and response speeds. Continuous recording ( o r input to any recorder or telemetry system) Automatic re-calibration and standardization. Automatic water-make-up and reagent handling. Unique in design and easy to operate. Low installed cost. Highly reliable-unattended operation Dual channel models available.
ATLAS ELECTRIC DEUXCES COMPANY 4114 N. RAVENSWOOD AVE., CHICAGO, ILL.. U . S . A . 60613 P H O N E 312-327.4520 C A B L E , ATELDECO Circle No. 11 on Readers’ Service Card
508
Environmental Science & Technology
DEARSIR: Time has finally caught up with us and our technological tampering with the environment no longer can be lightly brushed aside. The problems and challenges must be met by those with enough background to enable them to efficiently and broad-mindedly set to work, and this calls for education. I think we would all agree with H. E. Hoelscher, W. R. Turkes, and J. I. Abrams, that “Educators have a vital role in environmental engineering” (ES&T, March, 1969, pages 23540). The need for appropriate training in engineering graduate work has been demonstrated and solutions outlined. I wonder, however, if such educational programs should not also be included in physics and chemistry courses not necessarily leading to an engineering degree, at the undergraduate level. (Continued on page 5 1 0 )
