Small-scale wastewater treatment equipment can adapt to different environments . Daily life causes significant pollution to the environment , and the wastewater discharged in daily life can have a great impact on the surrounding environment . We need to use small-scale wastewater treatment equipment to solve this problem . The following article will provide a detailed introduction .
1. Biological contact oxidation is a wastewater biological treatment method derived from the biofilm method. It involves filling a biological contact oxidation tank with a certain amount of packing material. Utilizing the biofilm attached to the packing material and a sufficient supply of oxygen , the organic matter in the wastewater is oxidized and decomposed through biological oxidation , achieving purification . It combines the characteristics of the activated sludge process with the advantages of both . Under biochemically permissible conditions, it has achieved good economic benefits in the treatment of industrial wastewater, livestock wastewater, and domestic sewage . This process is widely used in wastewater treatment systems across various industries due to its high efficiency, energy saving, small footprint, resistance to shock loads, and convenient operation and management .
2. Domestic sewage ( after passing through a septic tank ) flows by gravity into a fine screen tank to remove large settling solids and suspended solids before flowing into an equalization tank . The effluent from the equalization tank enters a biological contact oxidation tank. This tank is filled with soft packing material, and aeration occurs as the wastewater flows through the packing layer, allowing a biofilm to grow on the surface. Micro-dynamics, achieved by a small blower, ensures the sewage comes into full contact with the biofilm under aerobic conditions. Microorganisms in the sewage gradually oxidize residual organic matter into carbon dioxide, water, and cellular matter, thus purifying the sewage . Simultaneously, dissolved oxygen levels are controlled to ensure that ammonia nitrogen in the sewage is converted into nitrate nitrogen by nitrifying bacteria . The effluent then undergoes solid-liquid separation in a sedimentation tank , followed by a filtration tank filled with hard packing material (quartz sand) for further adsorption and sedimentation treatment, ensuring the effluent meets discharge requirements . Finally , the sewage flows into a disinfection tank where chlorine dioxide is used for disinfection, resulting in compliant effluent that is then discharged .
