For most heavy-duty truck and bus fleet operators, DPF cleaning has become a routine part of regular fleet maintenance. DPFs are unique in that they require periodic service, are prone to failure, and are expensive to replace.
With DPF cleaning comes a set of standard questions about the different procedures, what’s most effective, what’s least expensive and how do we minimize downtime?
This article will attempt to answer these common questions and give you a better understanding of DPF cleaning in 2017.
Why is DPF cleaning required?
A DPF physically traps and collects diesel soot and ash particles from diesel engine exhaust. While most of the trapped soot (organic matter) is burned off during periodic filter regeneration, metal oxide “ash” (inorganic matter) particles are not burned off. Ash is the inorganic material from lube oil and wear metals. It comes from the engine and is left behind after thermal filter regeneration. Over time, the unburned ash particles and soot will plug the filter unless the filter is periodically cleaned.
Oakland, CA, September 18, 2017 – Red Fox Resources®, a leader in industrial emission control system recycling has completed a move of its primary facility to a new location in Oakland, CA. The new facility will serve as Red Fox Resource’s corporate headquarters as well as the company’s Operations and Technology Center. The new facility more than triples the square footage of the company’s old facility, also located in Oakland. The new facility is located at 4055 Linden Street in Oakland, California.
Red Fox Resources recycles used diesel particulate filters (DPFs), diesel oxidation catalysts (DOCs) and natural gas catalysts from trucks, buses, construction equipment and stationary generators. Red Fox purchases spent emission control parts from fleets, service centers, manufacturers and dismantlers throughout North America.
We often use common customer questions as a yardstick for good topics that should be shared on our Red Fox Resources blog. For example, a very common question is, “how do we prepare shipments of DPFs and DOCs to be shipped to and recycled by Red Fox Resources?” It’s actually pretty straight forward, with the following requirements and a video overview:
The shipment must be palletized so it can be moved by forklift.
All the items must be secured on the pallet with shrink wrap or a wood/cardboard enclosure as shown in video.
Red Fox pays shipping costs only when you have a minimum of 5 DPFs/DOCs per shipment.
As DPF (diesel particulate filter) cleaning becomes a routine part of truck maintenance, the proper disposal of recovered DPF ash is a common question for shops and fleets. Unfortunately, depending on where your located this can be a complex topic. We’ll attempt to provide some clarity on DPF ash disposal in this article by starting with the basics.
This blog post is intended to be a general guidance on DPF ash disposal. You should consult your local and state environmental regulatory agencies for accurate regulations regarding hazardous waste determination and disposal in your area.
How is DPF ash generated?
A DPF physically traps and collects diesel soot from engine exhaust. While the trapped soot is burned off during periodic filter regeneration, metal oxide “ash” particles are not burned off. Over time, the unburned ash particles will plug the filter unless the filter is periodically cleaned.
Red Fox was proud to contribute to the July 2017 “Reman, Rebuild, Replace” column in Fleet Maintenance Magazine. The article succinctly covers the virtues of DPF/DOC recycling. See the full copy below or link to the article in the July 2017 Fleet Maintenance Magazine.
From July 2017 Issue of Fleet Maintenance
As part of the ratcheted-down emissions regulations finalized in 2001 for on-highway diesel engines, the U.S. EPA set standards – to be implemented in 2007 – requiring that particulate matter (PM) emissions be reduced by 90 percent. To achieve this, engine OEMs developed engines that would operate with higher efficiency and lower emissions.
The engines were equipped with exhaust aftertreatment devices that included diesel particulate filters (DPFs) and a diesel oxidation catalyst (DOC) system, and required the use of ultra low sulfur diesel (ULSD) and low-ash oils.
Since 2007, new heavy-duty on-road diesel trucks sold in North America included diesel particulate filters (DPFs) and diesel oxidation catalysts (DOCs) to comply with the emissions mandates of the Environmental Protection Agency (EPA). In total, this now means well over 3 million DPFs and DOCs are on the road needing regular maintenance, cleaning, or replacement due to end-of-life failure or damage.
Oakland, CA, September 1, 2016 – This program allows dealers of Hino Trucks to recycle spent emission cores, such as diesel particulate filters (DPFs) and diesel oxidation catalysts (DOCs), that either fail OEM core acceptance criteria or do not carry a core value. Red Fox Resources purchases the spent emission control systems from the dealer and reclaims the catalyst material for re-use.
Today the California Air Resources Board (CARB) heard and unanimously passed staff’s recommendations on amendments to the Aftermarket Diesel Particulate Filter Approval Regulation (note Chair Nichols abstained from the vote citing she did not hear the entire staff presentation). It is important to understand this hearing and approval process only applies to aftermarket diesel particulate filters (DPFs) in California. These parts are currently being legally sold and successfully deployed in every other state in the country.
Diesel Particulate Filters (DPFs) and Diesel Oxidation Catalysts (DOCs) have been a reality for fleets and diesel service shops around the US since 2007. In 2007 the EPA ratcheted down the emission standards for particulate matter (PM) from diesel engines by 90% from the 2002 standards. As a result of the implementation of the 2007 standard, engine OEMs were then required to include DPFs in their standard engine package as DPFs are able to achieve the emission reductions needed to meet the standard. DPFs have been a standard component in diesel engines since 2007.
1. Failed Diesel Particulate Filters (DPFs) and Diesel Oxidation Catalysts (DOCs) can be recycled.
Many DPFs and DOCs carry a residual monetary value that can be converted to cash through recycling. Recycling failed DPFs/DOCs can also offset disposal costs while keeping the price of new catalyst parts down. While the monetary recycle value of DPFs vary, all DPFs can be recycled. Contact Red Fox if you’d like to find out what those failed DPFs sitting on your shop floor may be worth.