이앤켐솔루션

DSULFER

A product that reduces the load of the post-stage desulfurization process by properly injecting iron hydroxide-based anaerobic digester stabilizer (DSULFER) into the anaerobic digester.

Introduce

DSULFER

Biogasification

Basic biogas plant process

dsulfer table
Reaction process	Reaction formula	Microorganism
Hydrolysis step	Organicsubstances → Sugars, Glycerin, Fattyacids, Aminoacids	Microbial in vitro enzyme
Acid production stage	Sugar → Acetic acid, Propionic acid, Butyric acid	Organic acid-producing bacteria
Methane production stage	CH₃COOH + 2H₂O → 2CO₂ + 8H (Oxidation reaction) 4H₂ +CO₂ → CH₄ + 2H₂O (Reduction reaction)	Methane microorganism
Hydrogen sulfide production stage	SO₄^2- + organic matter → S^2- + CO₂ S^2- + 2H⁺ → H₂S	Sulphur-reducing bacteria(SRB)

Swipe the screen to see more tables.

Iron hydroxide-iron chloride hydrogen sulfide reaction formula

FeCl₂ + HS^-+ H⁺ → FeS + 2HCl

2FeCl₃ + 3HS^- + 3H⁺ → 2FeS + 6HCl + S

2Fe(OH)₃ + 3HS^- + 3H⁺ → 2FeS + S + 6H₂O

2FeOOH + 3HS^- + 3H⁺ → 2FeS + S + 4H₂O

BMP(Biochemical methane potential) Test

Conditions for testing

Operation type

Batch (Anaerobic digester at City D Sewage Process Plant)
Test capacity per batch

150ml
Concentration of injection of digestive stabilizer

0g, 0.1g, 0.2g, 0.5g, 1.0g
Microbial concentration

20.4± 0.1 g VS/L
Concentration of organic matter (COD)

5.0g TCOD/L
Sulfur concentration

20.0 mg/L
Digester temperature

37 ± 1℃
pH

7.5 (Experiments with alkalinity of 5g/L as CaCO₃)
Medium

BA medium

Methane production by concentration of digestive stabilizers

Hydrogen sulfide production by the concentration of digestive stabilizers

Digestive stabilizer hydrogen sulfide adsorption test

dsulfer table
Dosing amount	Adsorption capacity (mg/g)
0.1 g/L Fe(OH)₃	63.4
0.2 g/L Fe(OH)₃	60.7
0.5 g/L Fe(OH)₃	28.4
1.0 g/L Fe(OH)₃	17.4

Comparative testing of hydrogen sulfide adsorption capacity of digestive stabilizers

As a result of the experiment of evaluating the adsorption capacity of hydrogen sulfide through BMP tests, it was confirmed that Fe(OH)₃ had the highest adsorption amount of hydrogen sulfide per unit mass.