> An asphalt manufacturing plant—which breaks down used product, and makes 1,500 to 2,000 tons of new hot mix asphalt for paving and construction contractors daily—found itself in the middle of new housing developments, as a nearby town grew into the previously uninhabited vicinity around the facility. Being proactive, the plant knew it needed to mitigate its odorous releases, or else they would end up as a popular target for complaints online and at town hall meetings.
>
> Initially, the plant tried using masking chemical products, but it found these agents did not adequately hide the asphalt processing smells, and the coverups made the problem worse in some cases. A lab then analyzed a sample to determine the most effective product for the unique odor combination.
>
> Using GC-MS and a human nose panel, the team determined an additive blend made to reduce hydrogen sulfide, mercaptans, styrene and general hydrocarbons in asphalt neutralized the offending odors of the unique asphalt blend. The plant now adds about one gallon of this formulation to each of its 6,000-gallon hot mix tankers, and remains in the good graces of its neighbors.

https://www.controleng.com/articles/odor-measurement-control-at-industrial-plants/

> A hot mix asphalt plant located in a rural area of North Carolina has a community of neighbors living approximately a quarter mile away. They began complaining about strong odors from the plant.
>
> The plant typically has several trucks a day arriving at the plant to offload liquid asphalt, with a volume that fluctuates depending on workload. The general amount of liquid asphalt is 6,000 gallons per truck, pumping into two 10,000-gallon tanks and one 20,000-gallon tank. In addition, a 16,000-gallon fuel tank accepts reprocessed motor oil #4.
>
> The asphalt plant, already keen on being a “proactive good neighbor,” addressed these odor issues by contacting us. With over 25 years of neutralizing odors in the asphalt industry, OMI Industries has experience in addressing the complex odor issues in the market.
>
> OMI responded quickly, and after an initial phone conference to establish the details of the problem, one of the company’s field sales engineers visited the facility. We recommended Ecosorb® additives, mixed directly into the asphalt. Ecosorb asphalt additives were successful in eliminating the odors from the facility by reducing hydrocarbon emissions during production and transport of hot mix asphalt.
>
> OMI’s additive injection equipment automates the process of feeding Ecosorb products into liquid AC or waste oil received at an asphalt plant. In this case, the customer chose to manually add the Ecosorb asphalt additive as the liquid AC and waste oil are offloaded on-site. This facility is using Ecosorb 206A at a feed rate of 0.7 gallons per 25 ton load of liquid AC. For the fuel oil, a feed rate of 1.5 gallons of Ecosorb 206A per 25 ton load is used.

https://ecosorbindustrial.com/resources/case-studies/asphalt-plant/