Quality Time

Features - Equipment News

DK Organics' grinding and screening equipment helps it produce quality mulch, soils and compost for customers in the Chicagoland area.

July 22, 2013

In every marketplace, businesses compete by establishing themselves with a competitive position that sets them apart. Sometimes that can mean providing the lowest price, the most unique twist or the largest selection. But for DK Organics in Lake Bluff, Ill., the focus has always been to provide the absolute highest quality products and follow the strictest production control to ensure that quality is consistently maintained. And for more than 20 years, it says it has been delivering some of the finest compost, mulches, soils and aggregates in the Chicagoland area.

It has been said that regulation can spawn an industry, and in Illinois that has certainly been the case for the compost and organics industry. When the green waste landfill diversion law was enacted in 1988, the market was suddenly faced with a glut of material that now had no established disposal solution. David “Sid” Gorter of DK Organics realized the tremendous potential that was unfolding and quickly scrambled to become educated enough to enter the business.

Gorter continued to refine DK Organics’ production methods and further increase the quality and purity of all its products. Continuous process improvements, capitalization on new university-level research and advancement in equipment were all investments the company made to ensure it maintained its high quality advantage. Creating top-quality products requires top quality equipment, and a critical piece of equipment for any organics yard is a screen. DK Organics was one of the first companies in the United States to own a Doppstadt SM series trommel, acquiring its first unit back in 2003, just a year after the screens first became available domestically.

DK Organics Operations Manager Andrew Mariani says, “The efficiency of [the trommel’s] production, the ease of operation and the minimal downtime have definitely had a positive impact on our operations and our product quality.”

A Demanding Job
DK Organics’ Doppstadt trommel is certainly asked to do a lot, including screening fines from mulch, finishing compost, creating blends and cleaning soil. The company even offers it on a contract basis to organic farmers off-site who are running small-scale compost operations. But never content with the status quo, Gorter already had his eye on the next innovation he identified that would propel the company further ahead of the competition. “For years, Sid was waiting for the Doppstadt star screen insert to become available in the U.S. market,” recalls Mariani. And just as it was among the first to get its hands on the Doppstadt brand back in the early 2000s, DK Organics was again among the first to get an SM star screen insert in March of 2011. “We traded in our existing [SM] 720 and got a new 720 with the star screen,” Mariani says.

The Doppstadt star screen insert is engineered to drop directly into the trommel unit, replacing the drum in what Doppstadt calls an easy 15-minute change. It works on a revised principle utilizing a urethane star design for extended life. The star shape on the shaft is oblong as opposed to the conventional round star, which aids dramatically with shaft cleaning. Alternate shaft speeds on the deck, exclusive to Doppstadt, are extremely effective in the stratification of material feed, leading to a cleaner oversize product and increased production rates, according to Doppstadt. Wet, clumpy organic material with moisture content as high as 60 percent or more can continue to be processed, with throughput results as much as 50 percent higher than screening through a drum, the company maintains.

For DK Organics, the results were significant. “We had been running a 1.5-inch drum, but recognized that we were just not getting the product we wanted in the time we wanted it with the quality we are aiming for,” says Mariani. “But the star screen was an immediate game changer for us. We were now doing in a day what had previously taken nearly a week to run, seriously.” The resulting increase in quality also was dramatic, and Mariani says he believes this single equipment investment alone has put the company far ahead of the competition.

“DK Organics is obviously not the only game in town, and other providers work hard to meet the needs of their customers too,” Mariani acknowledges. “But for us, our goal is to produce and deliver the highest quality compost, mulches and soils possible. Our customers come to us with that expectation and we need to always look for ways to exceed their standards. Our investment in this star screen is another example of that.”

Quality Control
DK Organics says its process begins with control over the source product. The company insists on using only clean, controlled yard waste and landscape material. After primary shredding, it produces a menu of mulch products, some of which are double- or even triple-ground fine to result in a premium product. Source materials include southern hardwood bark, premium hardwood and leaf mulch. Color and texture is crafted through precision aging. The company recently added a dark red product to its collection as a result of strong local demand.

Composts are produced with an initial grind, after which the material is windrowed and aged for two to three months. Heat, oxygen and moisture are constantly monitored; the piles are turned to replenish oxygen and grass is added when additional moisture becomes necessary. The final product is screened for purity and sold in bulk. Custom-blended composts, mulches and soils can be crafted upon request and are mixed in the Doppstadt SM trommel with the star screen insert. Mariani has found that the strong agitation of the star screen is a perfect environment for producing a consistent blended product.

As with any industry, staying on top means not standing still. Competition is always going to catch up, and marketplace demands constantly mature. As standards rise and expectations become greater, DK Organics says it will always be thinking two steps ahead. It has been more than 20 years since the company first realized the opportunity to gain an advantage in the Northern Illinois market, and it’s not about to let its guard down any time soon. C&DR

The article was submitted by Doppstadt US, Avon, Ohio. More information is available at