Slow-release tablet for dispersion-type sewage deep treatment and preparation method of slow-release tablet

Abstract

The invention provides a slow-release tablet for dispersion-type sewage deep treatment. The slow-release tablet consists of poly aluminium chloride (PAC), stearic acid, calcium stearate and polytetrafluoroethylene. The invention also relates to a preparation method of the slow-release tablet for dispersion-type sewage deep treatment. The preparation method comprises the following steps: S1, sieving the PAC, the stearic acid, the calcium stearate and the polytetrafluoroethylene to obtain the raw material particles with a particle size of 100-200 meshes; S2, mixing the raw material particles consisting of 3-7 parts by mass of the PAC, 2-6 parts by mass of the stearic acid, 0.2-0.8 part by mass of the calcium stearate and 0.3-0.7 part by mass of the polytetrafluoroethylene; S3, carrying out stirring by adopting a stirring machine to obtain uniform raw material particles; and S4, adopting a forming die and carrying out tabletting forming by a tablet press to obtain the cylindrical tablets,wherein the tablet forming pressure is 75000N-80000N. After the release is finished, the failed tablets can be recycled, and new raw materials are supplemented for preparation again, so that the costis saved. The slow-release tablet provided by the invention has an excellent effect of dispersion-type sewage deep treatment, and effectively improves the water outlet index; and meanwhile, the slow-release effect of the slow-release tablet is excellent, the manpower maintenance cost is saved, and the promotion and application of rural sewage treatment are facilitated.

Description

technical field [0001] The invention relates to a sewage advanced treatment agent, in particular to a slow-release tablet for dispersed sewage treatment. Background technique [0002] The amount of domestic sewage produced in rural areas across the country is more than 9 billion tons every year, which has become an important source of environmental pollution. Distributed pollution point sources such as rural domestic sewage involve a wide range, scattered distribution, relatively strong randomness, large changes in water quality and quantity, and complex sewage components. [0003] Domestic sewage often contains a large amount of phosphorus, which will cause excessive algae reproduction when discharged into the water, resulting in eutrophication of the water body and deterioration of water quality. In domestic sewage, 80% of phosphorus comes from human excretion, and the rest comes from washing wastewater and food waste. Among them, phosphorus-containing washing powder is ...

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Problems solved by technology

[0004] Most of the existing rural scattered domestic sewage treatment equipment adopts the anoxic-aerobic (AO) process. On the one hand, the biological phosphorus removal effect is very small, and the phosphorus in the effluent is difficult to meet the standard; the existing technology also uses the electrolytic phosphorus removal process to ensure Phosphorus in the effluent discharges up to the standard, but it is suitable for small equipment. The energy consumption above 5T / d is very high, and the loss of the electrode plate is serious, so it is not suitable for use; The release time cannot be predicted. Generally, additional storage tanks and metering pumps are required, and an additional worker is required to maintain equipment and prepare pharmaceuticals every day. For the characteristics of wide distribution and long distances in rural areas, such maintenance will bring additional equipment costs. and manpower maintenance costs; on the other hand, in the traditional dosing process, although the reaction is quick, it cannot be sustained, and manual or equipment continuous dosing is required, which is not suitable for distributed small sewage treatment systems in rural areas, and suspended solids, total Phosphorus, floating oil, chroma and other indicators cannot meet the national water treatment standards, and advanced water quality treatment cannot be achieved; if adopted, although the sewage treatment system with reverse osmosis membrane structure has a good treatment effect, the construction cost is high, and it is not suitable for distributed small sewage in rural areas. Treatment system, the processing capacity is not large, and there is an urgent need for a slow-release domestic sewage advanced treatment tablet, and a tablet with better slow-release effect, so as to improve the quality standard of the treated water

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