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Magnesium hydroxide on an anaerobic cogeneration plant at a piggery farm South West Victoria, Australia.
case study summary
Challenges
- To increase profits by reducing chemical consumption and increasing power and biogas generation.
- To improve biogas quality and quantity and reduce odors
due to H2S. - To reduce blockages due to struvite formation.
- To reduce chemical usage and inculcate environment-friendly
solutions.
Objectives
- Reduce H2S in biogas from existing 700 ppm
- Avoid the use of a chemical scrubber
- Generate more biogas
- Generate more power
- Reduce retention time
- Reduce blockages from struvite
- Safe product to handle
- Reduce Sodium Hydroxide consumption
Solution
Download Success story
Magnesium hydroxide provides the following solutions:
• Improves biogas quality and quantity.
• Reduces H2S, thus reducing odors.
• Reduces soluble phosphate levels and struvite build up.
• Does not add salinity to soil and improves SAR values in the soil.
• Is non-corrosive, environment-friendly and safer to handle.
Benefits of Magnesium hydroxide
The production of biogas was increased by 30%, having improved quality with increase in Methane (CH4) by 19%.
The average production of energy increased by 15%.
A significant increase in earnings ($68K) was achieved from increased power generation and reduced chemical.
The average levels of H2S were largely reduced by 70%.
The average daily effluent soluble phosphate levels decreased by 40%.
Wastewater Process
BEFORE TRIAL POWER GENERATION Generator:
Generator: 1300MWh Per year
Thermal power: 214KWth Hour
Electricity: 192 kWh
The wastewater stream volume is reduced to 100,000 litres per day which goes though the anaerobic system.
Breakup:
35,000 Litre from the DAF
65,000 litres from the solids screens
TYPICAL ANALYSIS GOING INTO THE ANAEROBIC SYSTEM
INITIAL LABORATORY TESTING COMPARING DIFFERENT ALKALIS
Test Method equal amounts of activated sludge
+ equal amounts of wastewater stream
+ equivalent dose rates of tested alkalis
= Average biogas volume generated measured over a 4 day period.
For the same alkalinity dose, magnesium hydroxide resulted in 300% more biogas generation.
PHOSPHATE REMOVAL & STRUVITE FORMATION
Magnesium hydroxide Mg(OH)2 helps locking up phosphates and ammonia in the wastewater stream by forming struvite:
MAGNESIUM HYDROXIDE BENEFITS VERSUS CAUSTIC SODA OR LIME?
• Magnesium hydroxide is safe to handle
• Non corrosive
• Safe for the environment
• Does not add to salinity
• Improves SAR value in soils
HYDROGEN SULFIDE (H2S) LEVELS
Trial started on the 8/24/2015.
The piggery used ferric chloride and had a normal raw biogas H2S levels around 700-500ppm.
Since introduction of magnesium hydroxide, the average levels of H2S were reduced by 70%.
AVERAGE MONTHLY BIOGAS PRODUCTION
Same effluent production – (7,620 sows equivalent)
Magnesium hydroxide increased biogas production by 30%on average.
MONTHLY ENERGY PRODUCTION (KWH)
Same effluent production – (7,620 sows equivalent)
Magnesium hydroxide increased power production by 15%on average.
Gas quality
Magnesium hydroxide increased CH4 by 9%
TYPICAL VERSUS ACTUAL IOGAS PRODUCTION
Ref: Analysis of energy production costs from anaerobic digestion systems on US livestock production facilities. Oct. 2007.
INCREASE REVENUE FROM YOUR WASTEWATER REDUCE COSTS AND INCREASE PROFITS
– Cost of the magnesium hydroxide per year = $11 k
+ from removing chemicals from the scrubber(due to reducedH2S) = $10k
Total increase in earnings using magnesium hydroxide
= $68k / year
CaseStudy increased earning per year from power generationusing magnesium hydroxide.
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