Do you know how much of a burden the nappy consumed in a year can put on the environment? With the liberalization of the fertility policy and the gradual increase in the per capita income level, the sales growth of nappy has been promoted. However, if a large amount of waste is not properly disposed of after use, it will inevitably bring great pressure to the environment. For this reason, further subdivisions are necessary when degrading. Next, the main developments in separation processing are briefly described.
Conway filed a patent in 1996 for the disposal of waste personal hygiene products, including baby nappy, feminine hygiene products and adult incontinence products, allowing the different components of these wastes to be separated and reused. The patent describes the equipment required in the treatment process and a complete treatment line. The first step is to soak the product waste in a liquid environment to dissolve some soluble particles and substances. The dissolution process does not disrupt the structural composition of the product. The bleaching solvent is then sterilized. Finally, the plastic and cellulose components were separated and arranged in sequence: coarse crushing, fine crushing, plastic separation, polymer water-absorbing resin separation, and nappy biodegradable fractions were recovered. The treatment process requires a lot of water, so the corresponding treatment plants need to build wastewater treatment equipment to realize the reuse of wastewater.
Headquartered in the UK, Knowaste is the first company in the world to specialise in recycling waste nappy and other hygiene products. In 2010, it established a factory in Slovenia, Europe, and in 2011 in the United Kingdom. At present, there are 5 factories in the United Kingdom, and the annual processing capacity reaches 1/5 of the British personal hygiene product waste. Fibres and plastics are recovered at 98%. The key to recycling waste nappy technology is to overcome the difficulties of different materials in absorbent hygiene products (AHP). Main methods: 1. The AHP waste is first sent to the autoclave, the main purpose is to break the AHP boundary and sterilize; 2. Then use special chemicals to clean and separate the superabsorbent resin. After this step, the plastic is separated and sent to a separate unit for processing; 3. The plastic is filtered and purified again in the second washing cycle, and then extruded into pellets for sale; 4. The remaining waste is sent to the screening process , the remaining plastic and other organics are collected together and separated from the cellulose. It is worth noting that during the treatment process, the water discharged from each washing cycle is collected and reused in the Knowaste system after evolution to form an environmentally friendly treatment system. The above-mentioned treatment methods are efficient and mature in technology, but it is difficult to break through the independent technology and the investment is large.
In addition, Japan's famous SFD treatment system converts waste products into fuel. An SFD system can process 300kgnappy per day and produce 170kg of regenerated fuel.
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