17% biogas boost at California dairy digester with one-time BioReact AD dosing

THE SITE
A California-based renewable energy company operates a 9-MG dairy digester in Sacramento County. The system has been operational since July 2013. It receives manure from the farm’s 1,300 cows. The combined heat and power engine of the digester has a capacity of 600 kW. The farm uses 100% of the energy that it generates.

THE PROCESS
Drylet dosed 400 lb of its innovative BioReact AD product in one single application. The monitoring period lasted 60 days. The biogas and energy produced from the 600-kW rated engine was tracked, recorded, and compared to the same period of the previous year.

THE OUTCOME
The company achieved a 17% boost in biogas production and and a 12% increase in power generation over the 60 days of the monitoring period

ManureMagic® cuts power-washing events 68% year-over-year at problem site

A major swine producer routinely uses ManureMagic® for a variety of needs ranging from solids liquefaction in deep and shallow pits, freeboard increase in lagoons, and spot treatment of nuisance manure accumulation throughout their operations.

In a recent example, applying ManureMagic to a problem site helped reduce the total number of days when the pressure-washing service was called to remedy stubborn manure accumulation from 163 calls in 2018 down to 52 in 2019.

The site consists of three farms, each with a shallow pit designed with two 20,000-gallon pits. Each of the pits were treated just once in early 2019 with 25 pounds of ManureMagic. By the end of 2019, a 68% reduction in total service calls for pressure washing was achieved compared to 2018.

This customer has continued to be amazed by the speed and longevity of performance by ManureMagic. Just one application of the product significantly reduced the accumulated solids throughout the pits and decreased their reliance on pressure washing to get the manure flowing.

30+% boost of average daily biogas production at Wisconsin dairy farm

THE IMPACT ON REVENUE

The demonstration resulted in an over 30% average boost of biogas generation. At the site, methane from biogas is used to generate electricity. Most of it is sold to the utility. It was calculated that electricity from the additional methane generated through using Bio

React AD represents a net value of about $470 per day.

Additionally, significant solids reduction resulted in cleaned-up sludge lines, reducing operating and maintenance costs.

THE SITE
Dallmann’s East River Dairy is host to a 1.7-million gallon capacity digester designed by DVO, Inc. The manure from its 2,400 cows generates electricity, bedding, fertilizer, and heat. The operation also incorporates an ammonia/nitrogen recovery system after the digester, which helps to clean the biogas. The resulting methane generates enough electricity to power 500 homes — it is sold to the utility.

THE TECHNOLOGY
Dryletʼs innovative technology draws from material science and microbiology. Its BioReact AD product is comprised of carefully selected beneficial microbes embedded inside non-toxic particles made of an engineered porous media substrate. The particles are approximately 200-600 µm in size. They protect the microbes, allowing them to thrive and replicate fast so they can be effectively integrated into microbial ecosystems.

HOW IT WORKS
Anaerobic digestion is a three-step process:
1.Hydrolysis: Long-chain molecules from bacteria, such as carbohydrates, proteins and fats, are being degraded into sugars, amino acids and long-chain fatty acids respectively.
2.Acidogenesis and acetogenesis: The products of hydrolysis are converted into short-chain fatty acids (e.g. acetate), CO2 and H2.
3.Methanogenesis: Archaea (methanogens) convert SCFA, H2 and CO2 into methane.

The lysis, or breakdown, of the bacterial cell wall is necessary before the longchain molecules contained inside the cell can be broken down. Drylet’s innovative technology enables the enhanced degradation of undigested solid waste (hydrolysis), promoting a reduction in biosolids and an increase in the generation of biogas.

THE PROCESS
BioReact AD was dosed in the methane digester at a daily rate of 13 lb over 61 days. With a consistent influent (cow manure) in both composition and quantity over the whole period and no operational changes, the effect of BioReact AD clearly registered as a stable increase of biogas production with unchanged gas composition at 60% methane.

Aqua Assist improves settling, increases clarification capacity at 58-MGD WWTP

Changes in settling volume and SVI in the North and South Trains

After two weeks, the SVI differential between the North and South train was closed from about 23% to about 8% (see
Figure 2 at left). By the end of week 3, the SVI in the South train had reached 16% less than the value in the North Train. Similarly, settling volume went from being 30% higher in the South vs. North train to being 23% lower over the duration of the test.

THE SITE
The 58-MGD WWTP operates a highpurity oxygen-activated sludge wastewater treatment process. It runs two
parallel aeration batteries with three passes each. The North Aeration Battery had historically better settling behavior than the South Aeration Battery.

THE TECHNOLOGY
Dryletʼs innovative biocatalyst draws from material science and microbiology. Its Aqua Assist product is comprised of
carefully selected beneficial microbes embedded inside non-toxic particles made of an engineered porous media
substrate. The particles are approximately 200-600 µm in size. They protect the microbes, allowing them to
thrive and replicate fast so they can be effectively integrated into microbial ecosystems.

THE GOAL
The demonstration was intended to determine whether Aqua Assist could be a viable, non-chemical option for enhancing settling and improving clarifier capacity during high flow periods. The acclimation period was about two weeks; the effects of the Drylet product lasted for about two weeks after dosing was stopped.

THE PROCESS
It was jointly decided by Drylet and the WWTPʼs operational team to dose Aqua Assist during 24 days to the South Aeration Battery, which had worse settling. The acclimation period was about two weeks and the effects of the Drylet product lasted for over two weeks after dosing was stopped.

TRENDS
The SVI trends were higher in the South Aeration Battery (green line in Figure 1) prior to the start of the dosing. Within two weeks, the SVI trends between the North and South Aeration Batteries had converged. From then onward, the South Aeration Battery showed much improved settling behavior. The improved settling in the South Aeration Battery continued to be observed almost two weeks after dosing stopped

BioReact AD boosts biogas 32%, lowers NG use 10% at 55-MGD WWTP

DEMONSTRATION PROTOCOL

BioReact AD was fed to both the 10 primary and 3 secondary digesters in varying amounts, totalling 50 Ibs per day (one of the secondary digesters was offline and under maintenance during the demonstration period.) The sludge-feeding arrangement into the secondary digesters is as follows:

Primary solids and thickened WAS are mixed in a sludgeblending tank prior to being fed into the primary digesters. During the feeding of solids into the 10 primary digesters, the overflow of the corresponding quantity of fed raw digester solids (primary digestate) flows into the connected secondary digester. A single feed point was used for all the primary digesters. The overflow from three selected primary digesters (PD3, PD5, PD11), was used for applying product dosage into the secondary digesters.

THE SITE

The 55-MGD wastewater treatment plant has been a leader in the use of renewable energy for wastewater treatment. It currently generates 95percent of the energy it uses from onsite biogas, purchased natural gas, and solar energy generation. Only 5 percent of its energy requirement is imported from the local power utility.

THE TECHNOLOGY

Dryletʼs innovative technology draws from material science and microbiology. Its BioReact AD product is comprised of carefully selected beneficial microbes embedded inside non-toxic particles made of an engineered porous media substrate. The particles are approximately 200-600 µm in size. They protect the microbes, allowing them to thrive and replicate fast so they can be effectively integrated into microbial ecosystems.

THE PROCESS

BioReact AD was added to the digesters starting in November 2018 with a daily dosing of 50 lbs. The goal was to boost biogas and enhance solids reduction. The demonstration took place over 90 days. Training was provided to facility personnel on the best points of product application.