Beyond the Pipeline: What a Digester Actually Changes on a Dairy Farm

How a renewable natural gas project at a Texas dairy partner is quietly reshaping bedding, nutrient management, and the farm’s bottom line — long before the gas ever reaches the pipeline.

Drive out to a large dairy in central Texas and the first thing that hits you isn’t what you’d expect. It’s the scale. Rows of freestall barns stretch across the prairie. A rotating carousel milks the herd three times a day, almost around the clock — so routine for the cows that it starts to look like social hour. The farm runs 365 days a year, and every one of those days produces a lot of manure.

That’s the part most people don’t see. Modern dairies generate enormous volumes of organic waste, and what to do with it has become one of the defining operational questions in the industry. The traditional answer — lagoons, hauling, spreading — works, but it doesn’t unlock much. An Avolta digester is built to unlock everything.

When we partnered with a multi-generational family dairy in Texas to design and install our system, the headline goal was renewable natural gas. But what’s become the bigger story — the one the farm’s operations team keeps coming back to — is what happens to the manure before it ever becomes gas.

See how Avolta’s digester system is helping a Texas dairy turn everyday waste into cleaner bedding, smarter nutrient management, and renewable natural gas.

Sand that pays for itself

At most dairies, sand is the preferred bedding material. It drains well, stays cool, and keeps the herd comfortable — which translates directly to healthier cows and better production. The catch is cost. Bedding sand is a recurring line item, and at the scale of a large operation, it adds up quickly.

Our process starts with mechanical sand separation. After vacuum trucks collect manure from the freestalls and deliver it to the day pit, the first stop is a set of screw separators. The sand — which is abrasive and hard on downstream equipment — is pulled out, laid on a pad, and cycled over several weeks until it’s clean, dry, and ready to go back into the stalls.

The result: the farm is now recycling a meaningful share of its bedding sand instead of buying it new. That single loop has quietly reshaped an entire cost center.

Nutrients where they need to go

After sand removal, the manure moves into solids separation. A screw press pulls out the larger fiber solids — clean, organic material that some dairies repurpose as bedding for other pens. What’s left is a nutrient-dense liquid stream, and here’s where dairy operations often hit a wall.

Manure is full of nutrients, which sounds like an asset until you see how regulated field application has become. Phosphorus in particular is tightly constrained in many regions, and over-applying near the barns creates environmental and compliance risk.

Our dissolved air flotation (DAF) system is built for this problem. It removes a high percentage of phosphorus from the digested liquid, producing an effluent that can be transported further from the dairy and applied across a wider radius of fields. The farm’s nutrient management plan suddenly has more flexibility — and the operations team has reported being pleasantly surprised at how well the crops have responded. In some fields, the difference between where digestate was applied and where it wasn’t is visible from the road.

Renewable natural gas, and the revenue behind it

Only after all of that does the manure reach the digester itself. Raw biogas is captured, CO₂ and VOCs are removed, and what comes out the other end is 99% pure methane — pipeline-quality renewable natural gas.

The injection point for this project sits about 15 miles from the site, so the RNG is trucked to an alternative delivery point and moved onto the grid from there. Beyond the sustainability math, the environmental credits generated by this pathway trade on the open market, creating a new revenue stream that flows back to the dairy.

For a farm that was already managing waste every day, that’s the shift: the waste isn’t an expense anymore. It’s a product line.

Built for a 15-year partnership

A digester is, in one sense, a relatively simple piece of infrastructure. The hard part is everything around it — understanding a specific farm’s flow, integrating into routines that can’t tolerate downtime, and staying close once the system is running.

“Our team at Avolta looks at these projects really as relationships more than anything,” says Brian Yockel, an Avolta team member who spent years as a dairy producer in the southeast before joining the company. “We’re going to be on site with these dairies for a 15 to 20 year period. They know if there’s an issue, they can call — and any one of us will answer the phone.”

That long-horizon model is why we take the time to learn each operation before we design the system. A digester that works on paper but disrupts milking, feeding, or bedding isn’t a win for anyone.

What this unlocks

Dairies like this one are family businesses — multi-generational, community-rooted, and often misunderstood by anyone who hasn’t walked a barn. There are fewer of them every year, and what they need from a partner isn’t just technology. It’s technology that respects how the farm actually runs.

We’re taking what we’ve learned from this project and bringing it to the next one, and the one after that. Cleaner bedding, smarter nutrient management, a new revenue line, and a pipeline-quality gas product — all from a waste stream that used to sit in a lagoon.

A greener, friendlier environment, built one partnership at a time.

Learn more about Avolta’s RNG projects at gotRNG.com.