GasMix AD - US Edition

Landia GasMix Anaerobic Digester Mixing System

2

Landia GasMix

Welcome to Landia It is true that we have been manufacturing pumps since 1933, but we are keener than ever to produce the very best solutions – and match that with unrivalled aftersales support.

We thrive on providing long-term solutions for our customers, focusing on low CO2 impact, better efficiency and performance, whilst making every effort we possibly can to reduce power consumption and improve Health & Safety.

We are not part of the throwaway culture. As a Danish company, we are subject to very strict national regulations on energy consumption, waste handling, and wastewater – and rightly so.

Throughout our production process and beyond, we work to minimize environmental impact.

As well as Denmark, we have long-established business units in the UK, the USA, China, Germany – and solid representation all over the world. In order to provide the very best technical solutions, everyone involved in the sale of Landia equipment has an engineering background.

Our Landia GasMix system is a good example of how we find the right answer to your specific application. Landia GasMix is a relatively simple process that will improve your gas yields - but at the same time, reduce your energy bills - and provide a safer environment for your workforce.

By working closely together and understanding your needs and aims, we can ensure that your digester is being mixed to its optimum level, helping bring about benefits throughout the whole process.

TARGET 6.3 Being part of the wastewater industry for decades we constantly strive to develop our solutions towards a better world.

TARGET 7.2 Landia originate from a part of Denmark where renewable energy simply is something we do – it is part of our heritage.

CHOPPER PUMPS & MIXER SOLUTIONS

TARGET 8 Great working conditions, respecting other people and cultures, honesty and integrity is part of who we are.

3

MIXING NOZZLE UPPER

LANDIA GASMIX NOZZLE

AUTOMATED VALVES

MIXING NOZZLE LOWER

LANDIA CHOPPER PUMP

4

Landia GasMix

Landia GasMix – how it works

When the GasMix chopper pump is running, thick liquid from the bottom of the digester is drawn into the pump where the solids are chopped before being discharged and pumped back into the digester. This accelerates the digestion process and it prevents clogging of pipes and nozzles.

In the first stage of the mixing process, the liquid is injected into the upper half of the tank while biogas is aspirated from the top of the tank and mixed into the liquid.

In the second stage of the mixing process, the liquid is injected into the lower half of the tank causing powerful mixing of the tank content.

Depending on the type and size of the digester there might be a third stage where the liquid is injected into the very upper part of the digester preventing solids to build up a layer of crust on the surface.

Unique Advantages

 Improved sludge reduction  Sludge concentrations up to 12%

 No crust on liquid surface  Genuine external mixing system

Landia GasMix Chopper Pump

A key component in the GasMix system is the chopper pump. In addition to providing the correct flow and pressure for the GasMix nozzles its integrated chopping device will chop solids into smaller particles, resulting in improved biogas process – and more biogas produced!

Landia GasMix Nozzle

The uniqueness of the Landia GasMix lies in the design of the GasMix nozzle. Years of development has gone into this to achieve the most efficient performance. When sludge is pumped through the GasMix nozzle, biogas is sucked from the gas holding part of the digester, mixed with the sludge and injected under pressure back into the digester, creating not only a horizontal mixing pattern but also a vertical pattern: true 3D-mixing.

Mixing Nozzle – Iower

The sludge is re-circulated through the lower mixing nozzle in order to create a rotational movement in the lower part of the tank and to avoid settlement on the tank floor.

"Crust Breaker" Mixing Nozzle – upper

The sludge is re-circulated through the upper mixing nozzle in order to create a rotational movement in the upper part of the digester and to avoid, or even break down, crust on the liquid surface.

Automated Valves

The Landia GasMix system is a flexible mixing system and the mixing process is controlled by means of a number of automated valves – pneumatic or electrical. This means the operation time of each nozzle is variable depending on the sludge characteristics and can be fine-tuned to provide effective mixing with the lowest possible parasitic load.

CHOPPER PUMPS & MIXER SOLUTIONS

5

The Chopper Pump

– the heart of the GasMix System The Landia MPTK-GI chopper pump is an integral part of every Landia GasMix system.

The chopper pump is designed for use under severe conditions and can pump sludges and other difficult to handle substrates with higher solids content and viscosity than almost all other pumps. The pump’s ability to cut large particles ensures that the GasMix system never stops and contributes to improved digester efficiency.

The Landia chopper pump is simple and robust in its construction, easy to service and with proven low life-time costs.

6

Landia GasMix

A unique mixing system - for anaerobic digesters

Landia GasMix is the ideal mixing solution for anaerobic digesters. Most importantly it is all externally mounted with no rotating equipment inside the digester. The entire system, including the nozzles, is mounted on the outside of the digester. Landia GasMix is hence the only digester mixing system where the digester never has to be opened for service or repair of the mixing system. This advantage also leads to significantly improved Health and Safety conditions.

Landia GasMix is suitable for most types of digesters and is suitable for a wide variety of sludges with a TS concentration of up to 12%.

A Complete System – guaranteed A key part of each Landia GasMix system is the pipework that connects all the components in accordance with the designer’s specification.

Landia is responsible for the pipe design - this is one less thing for the busy project manager to consider, saving time and money!  Customized for each individual project  Flexible pipe system without welding  Flow-optimized design  Easy to replace parts of the pipe system  Extra thickness for increased lifetime  Available in both stainless and mild steel  Complete delivery and assembly including start-up

CHOPPER PUMPS & MIXER SOLUTIONS

7

Recommended

– by satisfied customers

Bellozanne STW, Jersey

I stanbul Organized Industrial Zone for Tanneries, Turkey

Design Parameters

Design Parameters

Digester diameter

42 ft

Digester diameter

72 ft

Digester height (total)

45 ft

Digester height (total)

62 ft

Volume

450,000 gallons

Digester height (vertical)

47 ft

Substrate characteristics

sludge from WWTP

Volume

1.3 million gallons

TS, design

6%

Substrate characteristics

sludge from WWTP

TS, nominally

3%

Average TS, input

4-6%

No. of digesters

3

No. of digesters

2

Year

2014

Year

2015

Three cast-in-situ concrete digesters each equipped with one Landia GasMix 30 HP. “We didn’t want any breaks that would interfere with our gas production. Lowest possible price wasn’t our objective, not for one second. We were making decisions on what was most appropriate – for the long-term. A mixing system that could produce the most gas yet be the lowest on maintenance made perfect sense.”

Bob King, Senior Engineer, Jersey’s Department for Infrastructure “It is interesting that many digesters in the industry run on 2 to 2.5 % solids, when with a simple retrofit to a superior mixing system, they could increase to 4 % and see an immediate pay off.”

Dave Garnett, Technical Specialist (wastewater) at Doosan Enpure.

8

The digesters are glass fused to steel tanks built on top of existing concrete foundation. The vertical height of the tank is 47 ft.

The digester is equipped with double membrane gas holder.

Landia supplied two GasMix 40 HP for each digester with an estimated power consumption of only 15-20 kw/h.

Specific benefits of Landia GasMix compared to traditional, mechanical mixing: • Quicker and cheaper installation, as all components are placed on the outside of the tank.

• More efficient anaerobic process and thus a quicker gas production.

• Low maintenance costs, as all mechanical and electrical components can be serviced from the outside without emptying the tank.

• No prolonged downtime, because the tank will never have to be emptied in order to inspect or service the mixing equipment.

Landia GasMix

Yeongcheon City, South Korea

Kawana STW, Australia

Design Parameters

Design Parameters

Digester diameter

65 ft

Digester diameter

32 ft

Digester height (total)

59 ft

Digester height (total)

37 ft

Volume

1.3 million gallons

Volume

210,000 gallons

Substrate characteristics

Food waste, agricultural waste and municipal sludge

Substrate characteristics

Waste ativated sludge

Dry matter content

6-7%

Dry matter content

3-4%

No. of digesters

2

Type of tank

Concrete tank

Type of tank

Glass fused to steel tanks

Year

2010

Year

2016

For the Yeongcheon project Landia supplied two mixing systems for each digester.

Each mixer is 40 HP however designed for on/off operation.

After fine tuning the system the mixing system now runs 24/7 due to increased biogas production.

Digester is mixed by means of one GasMix 25 HP designed for on/ off operation. Power consumption approximately 7-8 kw/h.

Process Benefits • More biogas – improved sludge reduction • Cost Benefits • External installation • Health & Safety benefits: no working at height – no restrictive breathing apparatus required.

The two digesters produce approximately 30% more biogas than expected.

CHOPPER PUMPS & MIXER SOLUTIONS

9

Viborg WWTP, Denmark Design Parameters Digester diameter

46 ft

Digester height (total)

46 ft

Volume

460,000 gallons

Substrate characteristics

sludge from WWTP

TS, design

8%

TS, reality

3%

No. of digesters

2

Year

2012

Existing concrete digesters each equipped with one Landia GasMix 40 HP. Due to the low TS of the digesters the mixing system operates as little as 10% of the time resulting in a power consumption of only 5-7 kw/h.

10

Landia GasMix

Landia is much more – than just GasMix

Landia is a pump and mixer manufacturer offering a comprehensive range of pumping and mixing solutions, suitable for numerous applications within the wastewater industry. Please see examples below:

Chopper Pumps The Landia chopper pump is designed for tough applications such as unscreened sewage, septic sludge, thickened sludge and other high solids liquids.

Recirculation Pumps / Wall Pumps Landia offers a range of low head recirculation pumps – 12”, 20” or 30”.

Capacity up to 45 MGD. Also available in AISI 316 stainless steel construction upon request.

Submersible Landia Mixer Landia offers a wide variety of mixers for wastewater applications all with focus on the lowest possible power consumption and the best Total Cost of Ownership in the industry.

AirJet Aerators The Landia AirJet is available as submersible, dry installed or as a floating unit. Extremely flexible non-clogging aeration system that requires no external blower or compressor.

BioChop Hygienisation System The Landia BioChop Hygienisation System is a compact system with an integrated water jacket for heating up the tank content to 158 °F and maintaining this temperature for one hour.

Available with up to 33,000 gals daily capacity.

CHOPPER PUMPS & MIXER SOLUTIONS

11

Landia was founded in 1933 and is today a modern, successful manufacturer of a comprehensive range of chopper pumps, propeller mixers and aerators, offering customized solutions and systems for difficult to handle liquids with high dry matter content, liquid biomass and other organic waste.

Our customers are involved in the design and construction of biogas plants, municipal and industrial wastewater treatment, processing of by-products and waste from the food industry, agricultural slurry handling and much more.

CJ04A.C15 • 2025

We support our customers through our subsidiaries and offices in the US, Germany, the UK and China – plus a worldwide network of professional distributors.

Landia Inc. • 2700 Gateway Centre Blvd, Suite 100, Morrisville, NC 27560 • +1 (919) 466-0603 Landia A/S (Headquarter) • Industrivej 2, DK-6940 Lem St. • +45 97 34 12 44 • landia.dk landiainc.com