Biological desulfurization system for biogas

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Biological desulfurization mainly includes systems such as biogas transmission systems, cooling systems, biological desulfurization tower systems, aeration tank systems, chemical dosing systems, water (gas) pump systems, water supply systems, water softening systems, waste discharge systems (if any), electrical systems, piping and instrumentation systems, and commissioning systems. The process for removing H2S from biogas through biological reactions consists of four units, including: a biological scrubber, a bioreactor, a sulfur precipitator, and a waste liquid discharge unit. Biogas is sent to a scrubber tower, where H2S is absorbed by the scrubbing liquid inside the biological scrubber tower. The gas comes into countercurrent contact with the washing liquid flowing from top to bottom inside the scrubber tower. The desulfurization tower is made of FRP material. It contains a specially designed, highly elastic filler dedicated for biological desulfurization; this filler should ensure that blockages do not occur, nor should it cause excessive pressure losses. The purpose of adding a filler to a biological scrubber is to increase the gas-liquid contact area. Biological desulfurization achieves fully automated control through multiple online monitoring instruments. The main operating parameters monitored include, but are not limited to: pH value, high and low liquid levels, temperature, and H2S concentration. The biogas desulfurization area is a blast-proof zone; electrical control equipment must be selected in accordance with blast-proof design requirements, and methane and hydrogen sulfide leak detection alarms must be installed as specified. The inspection, installation, and commissioning of mechanical equipment in biogas systems shall be carried out in strict accordance with the relevant requirements of GB 50231‑2009 \"General Specifications for Construction and Acceptance of Mechanical Equipment Installation Projects\". The inspection, installation, and commissioning of biogas system pipelines shall be carried out in strict accordance with the relevant requirements of GB 50236–2011 \"Code for Welding of Field Equipment and Industrial Piping\".