Managing Organic Residuals PWT
Meeting
Cornell Waste Management Institute
December 11, 2007 from 10 AM - 3 PM; Coffee at 9:30
Location:
Meeting Summary: There was a lot of discussion throughout the meeting. The topics that demanded the most attention were:
1. Training: both the November course and the push for what might be next with the NYSAR3 University Council that just started and the increased interest in food residual composting.
2. Choosing labs, sample analyses, what test methods are used and how do we interpret the results?
3. Banning leaf and yard waste from landfills and amending regulations to encourage food waste composting
4. What should be on a label or info sheet?
Presentation: Testing for potentially harmful chemicals.
To
DoÕs:
Bob Graves,
All - Updating CWMI Compost Facility maps- we count on people like yourselves to help give us leads to facilities, etc that want to be on the map.
Ellen Harrison,
CWMI Ð Until recently, composters couldnÕt report test results because of
fertilizer rules only guaranteed minimum NPK could be reported. That doesnÕt
work for composts, DAM changed the rules for agricultural composts so
characteristics can be reported on label. Ellen says wouldnÕt apply to leaf and
yard facilities, but Jean Bonhotal thinks it does Ð will need to check.
List of attendees
Affiliation |
Name |
Almstead Nursery |
Sean Allison |
|
Debra Smith |
Cattaraugus County Department of Public Works |
Al Ormond |
|
Kevin Mathers |
|
Wendy Sanflippo |
|
Keith Severson |
|
Adam Michaelides |
|
Amy Risen |
Cornell Waste Management Institute |
Jean Bonhotal |
Cornell Waste Management Institute |
Ellen Harrison |
Cornell Waste Management Institute |
|
Cornell Waste Management Institute |
Mary Schwarz |
Cornell Waste Management Institute |
Lauri Wellin |
|
Marshall Aikens |
|
Sue McIntyre |
|
Mark Darling |
New York State Department of Environmental Conservation |
Tim Baker |
New York State Department of Environmental Conservation |
Gary Feinland |
Onondaga County Resource Recovery Agency |
Jeff Cooper |
Onondaga County Resource Recovery Agency |
Andrew Radin |
|
Nadine Davitt |
|
Bob Graves |
Rensselaer Polytechnic Institute |
Steve Davis |
Town of |
Neal Sheehan |
We Care Organics |
Brian Fleury |
We Care Organics |
Mike McGrath |
Presentation
Testing for
potentially harmful chemicals: presented by Murray McBride, Professor,
Dept. of Crop and Soil Sciences, New Director of CWMI
¤
Testing processes for
metal contaminants in soils are very crude - they've been used for a very long
time with few changes Contaminants that should be tested for in waste materials
prior to considering land application include trace metals and non-metals, but
these rarely get analyzed in soils or waste materials, Other contaminants
important to test for include persistent Organic chemicals: these POPÕs
bioaccumulate in fat in people and animals and are found in a wide range of
different wastes - The third main type of contaminant of concern is pathogens -
(Murray doesn't work with these).
¤
¤
Metals of concern: all
on EPAÕs 503 list: phytotoxic: Cu, Zn, Ni, zootoxic: Pb, Cd, Hg, As - Molybdenum
is zootoxic to ruminants - plants readily take it up, but it doesn't hurt the
plants - makes ruminants not able to take up copper and thus become copper
deficient
¤
It is possible to test
for all of the metal contaminants above simultaneously, but in most cases you
will not find these
¤
Maybe the only
practical way to check for organic contaminants is to use a bioassay Ð e.g.,
check to see if earthworms die - if they do, then there's a problem - if not,
assume there's not
¤
If send samples to
Cornell for metal analysis and don't specify the purpose of the test, the lab
will use Morgan's solution to extract the metal from the soils and wastes -
this test is only used in the Northeast - PA uses the Mehlich 3 extract- Murray
says that these extractants are too aggressive - he suggests using a dilute
salt to extract the metal to estimate what is available to the plant.
¤
Most states in US use
Mehlich 3. which extracts about 25- 30 % of the total metal concentration in
the soil - when doing soil tests to comply with the EPA 503 regulation , an
even more aggressive extraction with strong acid is done because you really
want the total metals to comply with this rule.
¤
The soil test value
you get when extract for metals with dilute salt commonly correlates well with
the amount of metal that you will get in your crop, so it makes sense to use
this test if youÕre interested in plant availability and crop quality. On the other hand, traditional soil
tests don't adequately predict metal uptake by crops
¤
So, the test you
choose depends on what you are after. If you're worried about human or animal
contamination through soil ingestion, for example, then you probably want to
measure soil total metal, but if you're concerned about metal levels in the
crop, you can estimate plant uptake using salt extraction methods.
¤
Field research for
validating these soil tests is, however, very variable, as plant uptake is
affected by a number of variables, such as climatic conditions, not measured by
soil tests.
Discussion:
¤
Soil or waste samples
sent to different labs for testing can give different results because of
different methods used.
¤
Is metal uptake and
sensitivity is different by different plant species? In testing for available
metals in soils, what test plant should be used? Are there recommendations from
labs as to what or what not to grow in certain soils based on the metal levels
in the soil?
¤
Other Discussion:
General Composting
¤
Ellen asked if there was any move in NY to ban
organics from landfills Ð
¤ Jean says that currently the county can decide whether or not to take leaf and yard waste Ð county by county bans.
¤
CWMI has started to get more inquiries about
leaf and yard waste Ð we used compost course to get some better data on yard
waste compost.
¤ Pete Grannis, NYSDEC Commissioner, is very interested in air emissions situation Ð looking at putting a paper together about comparing greenhouse gas emissions between composting facilities and landfills.
Compost testing
¤ As
part of the recent compost short course, DEC provided funds to run some tests
on compost samples from leaf and yard facilities as well as some other
facilities. Samples were run by labs that use TMECC methods for compost
¤
¤ Analytes
important in this testing are pH, soluble salts,
¤ This
makes a case for a ÒlabelÓ Until recently, composters couldnÕt report test
results because of fertilizer rules, only guaranteed minimum NPK could be
reported. That doesnÕt work for composts, DAM changed the rules for
agricultural composts so characteristics can be reported on label Ð Ellen says
wouldnÕt apply to leaf and yard facilities, but Jean thinks it does Ð will need
to check
¤ Compost
information sheet: CWMI came up with content for the sheet based in part on
surveys and what came out of research done on manure based composts. What do
people think about the content of the sheet? We have not put anything on the
sheet as far as methods; do you think they should be there? WeÕre hoping that
compost facilities will take an interest in testing so they know what they
have.
¤ There
are a number of reasons why results from the same compost may differ. One issue
is that compost is heterogeneous and the amount tested is small so that two
samples are not really identical.
¤ Results
may also differ when samples are sent to different labs. This may be due to
different methods or may be that certain labs have different standards for the
variability they will allow in the lab. Nadine says that there are also issues
with types of tests and maybe they are not consistent with requirements for
some certification programs. Another issue is testing compost parameters under
compost conditions, not under soil conditions.
¤ We
Care Organics provides everything that is on this sheet Ð another thing that
would be important would be bulk density Ð they also include a 12 month average
of their metals because it is a biosolids product. Different results from different
labs is very frustrating especially when you are trying to get into a particular
project Ð need to check the methodology used to test or can sometimes get
values that donÕt make sense.
¤ There
are a number of methods that can be used to measure OM Ð weight loss on
ignition is the most inaccurate, but the least expensive Ð the other method
that is common is a chemical method that doesnÕt oxidize all the
¤ Based
on discussion Ð should we take the testing composts fact sheet and go one step
further and do one that is compost characteristics and test methods and what is
the acceptable range for these values Ð what are some of the methods that are
being used?
¤ Yes,
give ranges for each test methodology Ð this is my compost Ð this is the method
the lab used Ð this is the acceptable range Ð It would be helpful if there was
a dataset available giving acceptable ranges for each methodology.
¤ One
of the things in the On-Farm Compost Handbook would be to get some ranges from
the labs Ð Would they be including their test methodology with that?
¤ We
need to know how much (sample size) the lab uses to run the test.
¤ Most
of the places that are doing testing routinely are taking several grabs from
different places in the pile and then sending just one composite sample to the
lab. Some people keep a back-up of each sample just in case it needs to be
rerun based on some weird result.
¤ Some
facilities keep a cumulative database to be able to see if there are any
outliers.
¤ Does
anyone do the plant response test? Brian says that it is done with the US
Composting Council STA program Ð germination and growth are required (do it
quarterly)
¤ Delaware
Co does the full STA testing including growth about 5x per year mostly for
marketing purposes and they include an interpretation.
¤ Particle
size was done Ð in general, most people feel that the finer the better but
maybe that is not necessarily true Ð bigger particle size is good for erosion
control, etc.
Where to from Here?
Research,
outreach/extension, other needs; what partnerships to do the work? Who might
fund it?
Banning organics from landfills:
DEC is
interested in a ban on organics in the landfills: starting with leaf and yard
and then working into others from there. What do you think about a ban that
happens immediately after the regulation, or should it be phased in and for how
long?
A
proposed change to 360 Regs is to change maximum amount for source separated
food facility to up to 5000 yds of food waste before it would need to be
permitted.
How are we going to increase
capacity for composting?: WhoÕs
going to take it (as we make these bans, and we have more zero waste events,
how are we going to make sure that things get taken care of in the way they
should?).
Composting invasives:
Avian Influenza:
NYS Compost Short
Course
DVD and fact sheet on road kill composting
Request for info on
composting cat feces
Proposals submitted:
A Proposal was submitted to NNY - to look at quantity and Quality of leachate from mortality piles
not funded.
Road kill project extension - DOT in Riverhead received funding to look at quality and quantity in road kill compost piles