"Cloud tank" is a kind of decentralized sewage treatment equipment. The "cloud tank" is mass-produced in the factory and is suitable for installation in various terrains. The treated standard water can be directly reused for greening, spraying the ground or discharging landscape water. "Cloud tank" is the appearance (WBR) of mud film worm bed reactor. This process is an upgraded version of traditional sewage purification technology, and it is also the most widely used device for decentralized sewage treatment and the most installed sewage purification equipment. Sewage is pumped into the "cloud tank" reactor. Because WBR is filled with proprietary fluidized filler, most of the organic matter in sewage is removed by multistage purification of fluidized filler. At the same time, there is a high biomass in the reactor, which forms an aerobic sludge membrane biochemical system with fluidized fillers. Air is injected into the water through the fan. With the help of aerobic microorganisms, the organic matter in the water is degraded, ammonia nitrogen is oxidized, and anoxic zone and anaerobic zone are formed inside the filler, which cooperate with each other. The characteristics of township domestic sewage are that the quantity and quality change greatly, the general location is scattered, the management personnel are unprofessional, and most of them can not operate normally. Therefore, it is required that the sewage treatment facilities must be simple, convenient to manage and have little maintenance. Mud film worm bed technology (WBR) is adopted in the cloud pond, which makes the microbial concentration in the system high, which not only improves the overall removal efficiency of pollutants by the reaction device, but also ensures good effluent quality. At the same time, the reactor has good adaptability to various changes of influent load (water quality and quantity), and can resist impact load, thus stably obtaining high-quality effluent quality. The worm bed at the top can deeply purify the sludge, which can reduce the amount of sludge. Due to the existence of a large number of biofilm in the cloud pool, the sludge age is significantly prolonged, which is beneficial to the interception and growth of slow-growing microorganisms such as nitrifying bacteria and improves the nitrification efficiency of the system. At the same time, it can increase the hydraulic retention time of some refractory organic compounds in the system, which is beneficial to improve the degradation efficiency of refractory organic compounds.
2. Characteristics of Yunchi Reactor
(1) The installation of the cloud tank is low in investment and cost. Cloud tanks are basically mass-produced in factories, and their prices are very competitive in the industry.
(2) the installation site is not affected by the terrain, and the installation time is short and the effect is quick. The drainage pipeline connecting the cloud tank is very short, and the terrain requirements of the installation site are not high. It takes a short time to install a cloud tank. Once the cloud tank starts to run, its sewage treatment function can be brought into play immediately.
(3) The environmental water supply function is great. Generally, the water treated by cloud tanks is recycled or discharged to nearby rivers and streams, which plays a great role in maintaining the water volume of small rivers and streams and enhancing the water circulation of living areas and surrounding natural landscapes.
(4)** Resource utilization rate. Water reuse and sludge recycling after cloud pond treatment can be easily carried out. Cloud pond is mainly used to treat village sewage, and the treated water and sludge basically contain no toxic substances, which can be recycled and effectively utilized according to different needs.
(5) Easy to maintain. The cloud pool adopts modular and standardized design, which is more convenient for operation and maintenance, realizes maximum unattended operation, and solves the management and maintenance problems in decentralized sewage treatment operation.
(6) The integration of four patented technologies ensures the safety and stability of operation and good water purification effect;
(1) The microbial strain technology adds special biological strains, and under the conditions of micro-electric control (low DO and high MLSS), the microbial biomass in the biochemical pool is maximized, and the functional flora forms advantages (low temperature resistance, load impact, etc.). ), strictly control mass transfer, and efficiently degrade organic pollutants in water.
(2) Mud film worm bed technology (WBR) has two forms of biological water purification, namely activated sludge and biofilm, in the cloud pond, which realizes simultaneous nitrogen and phosphorus removal in a biochemical pond. At the same time, there is a bug bed at the top of the cloud pond, and the bugs in the bed can eat the sludge, so as to ensure that the sludge content in the effluent is lower than the standard requirements, and there is no need to add a membrane filtration system.
(3) Proprietary micro-oxygen technology realizes uniform aeration of biochemical pool through patented TPU aerator specially made by Harbin Institute of Technology. The generated bubbles are small, large in area and slow to rise, which greatly improves the oxygen dissolving efficiency and creates a stable and good living environment for microorganisms.
④ Modular design: The cloud pond adopts modular design, which optimizes and integrates technical modules such as biological bacteria, biofilm formation, worm bed and micro-oxygen oxidation, and integrates carbon removal, nitrogen removal, phosphorus removal, solid-liquid separation and other units in one reactor, which greatly simplifies the technological process and saves investment. In addition, multiple cloud tanks can be integrated into a larger sewage treatment plant, making operation and management convenient and control simple.
3. Operating parameters: the cloud pond is a standard modular sewage treatment equipment, and each operating cycle is 2h. The influent of the standard cloud pool is 10 min, the reaction lasts for 30 min, the aeration lasts for 1h, and the precipitation lasts for 20 min. The next water inflow period is the drainage period of the cloud tank (the parameters are adjustable, and the adjustment parameters are set by the PLC control module). The mixing method is air mixing, the equipment mainly includes water inlet pump and aeration fan, and the instruments mainly include electromagnetic flowmeter and ORP instrument. The sedimentation is the net sedimentation section of SBR mode, and the effluent passes through the upper fixed bed for 20min minutes. Choose polyurethane filter column according to the quality of inlet and outlet water. See the drawings for details. Other indicators are shown in the following table: