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.
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%.
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
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.
Magnesium hydroxide Mg(OH)2 helps locking up phosphates and ammonia in the wastewater stream by forming struvite:
• Magnesium hydroxide is safe to handle
• Non corrosive
• Safe for the environment
• Does not add to salinity
• Improves SAR value in soils
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%.
Same effluent production – (7,620 sows equivalent)
Magnesium hydroxide increased biogas production by 30%on average.
Same effluent production – (7,620 sows equivalent)
Magnesium hydroxide increased power production by 15%on average.
Magnesium hydroxide increased CH4 by 9%
Ref: Analysis of energy production costs from anaerobic digestion systems on US livestock production facilities. Oct. 2007.
– 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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