1. It is buried underground and the land surface above it can be used for greening and other purposes without any need to build room and of heating and heat preservation.
2. Plug flow biological contact oxidation is used for the secondary biological contact oxidation process, the treatment effect of it is better than that by complete mixing type and 2-stage serial complete mixing type biological contact oxidation pool. Additionally, it has smaller size than activated sludge pool, better adaptability to water quality, well impact resistance load performance and stable effluent qualitywithout sludge bulking. New elastic solid fillers are adopted in the pool, so the specific surface area is larger, biofilm culturing and deciduation for microorganism are easier, the removal rate of organics under the same organic load conditions is higher and the solubility in water of oxygen from the air is thus improved.
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3. Biological contact oxidation process is adopted for the biochemical pond and the volume load of its fillers is lower, and the microorganism is in the self oxidation phase, so less sludge is generated and sludge removal (sucked by dung-cart or dehydrate the sludge into sludge cake and then transporting them out) is needed once every 3 months (90 days) and even longer.
4. This buried domestic sewage treatment equipment can be used for deodorization with conventional upper air exhaust and soil deodorization measures.
5. Fully automatic electric control system and equipment failure alarm system are equipped for the whole treatment system of this equipment, so it can run safely and reliably with duly maintenance only rather than special daily management.
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