The algae-based micro-particle carrier consists of a non-conductive amorphous silica shell, nanopores, and surface metal active sites, which can form an unbalanced potential on the carrier surface. When in use, the algae-based micro-particle carrier is added to the biochemical system in a certain amount and fully mixed with the sewage. The unbalanced potential on the surface of the algae-based micro-particle carrier can destroy the electric ion circle in the sewage and neutralize the charge of suspended ions, promoting rapid physical flocculation and precipitation of pollutants in the water. At the same time, the algae-based micro-particle carrier has a huge specific surface area, huge pore volume and strong adsorption force, adsorbing ultrafine particulate matter to the carrier surface, forming a chain structure, and instantly sinking and separating from the water body.
In the aerobic tank inlet end of the sewage treatment process, the algae-based micro-particle carrier is continuously added at a ratio of 50~100ppm (this ratio is the ratio of algae-based micro-particle carrier to inlet water volume). The micro-particle carrier has a specific surface area of 20~40m² per gram. When the micro-particle carrier concentration in the biological tank reaches 0.7~1%, the specific surface area formed by the micro-particle carrier in each cubic meter of water can reach 20,000~60,000 square meters. In such a huge specific surface area, microorganisms attach to the surface of the micro-particle carrier without needing to capture pollution sources in the water body. They rapidly proliferate using pollutants enriched on the carrier surface as food and aggregate into micro-particle sludge of about 100~200 microns. At this time, anaerobic, anoxic and aerobic functional zones gradually differentiate inside the granular sludge, greatly enriching groups such as simultaneous nitrification-denitrification, short-cut nitrification and anammox bacteria, which more effectively remove organic matter and ammonia nitrogen, etc. The mechanism of action of the algae-based micro-particle carrier can be summarized in the following aspects:
(1) Physical flocculation and adsorption
The algae-based micro-particle carrier consists of a non-conductive amorphous silica shell and nanopores, which can form an unbalanced potential on the carrier surface. During water treatment, pollutants are rapidly electrostatically aggregated (physical flocculation) and precipitated. The micro-particle carrier has a huge specific surface area of 19~30m² per gram and strong adsorption force, adsorbing ultrafine particulate matter, color, heavy metals, toxic and harmful substances and odors to the carrier surface, which then sinks and separates from the water body.
(2) Biological carrier synergy
The specific surface area of 19~30m² per gram of the micro-particle carrier provides up to 20,000~60,000m² specific surface area for microorganisms in each cubic meter of sewage. Combined with the flocculation and adsorption effect of the carrier, it promotes rapid granulation of flocculent sludge. Anaerobic, anoxic and aerobic functional zones form inside the sludge, greatly improving the pollutant degradation efficiency of the sludge.
