Comprehensive recycling treatment method for wastes of papermaking factory

[0017] In the first embodiment, as in the first method, the waste plastics will be sorted to remove impurities, and the stones and fabric fibers in the waste plastics will be sorted. This will help damage the feeding device when the waste plastics enter the cracking furnace. The first Chinese patent applied for, the sorting equipment with the patent application number 2017104731508 is sorted; then the sorted waste plastics are sent to the cracking furnace for cracking; in this example, the previously applied Chinese patent application number is 2017108082319 plastic The waste cracking furnace is used as a cracking furnace. The waste plastic is sent to the feeding bin through the feeding conveyor device, and the screw feeder is pushed to the distribution device inside the furnace body. The cracking is carried out on the upper wall of the combustion chamber. According to different plastic materials, the temperature Gradually cracking from low to high; the oil or natural gas produced after cracking is used as fuel for equipment such as boilers in paper mills, so that fuel self-sufficiency can be achieved without leaving the factory, saving transportation costs and purchasing fuel costs; waste plastics generated after cracking For porous slag, the porous waste slag is used as a filter material, and the wastewater is filtered by putting it in the wastewater filter tank; this way, the wastewater does not leave the factory for treatment, and there is no need to add treatment equipment and chemicals, saving the traditional way of harmless treatment of wastewater The operating cost of the waste; the waste water filtered by the filter device is transported to the cracking furnace as the cooling water of the cracking furnace through the water pump and pipeline. In this way, the waste water can be used rationally without discharge to the outside, reducing environmental pollution; in sludge treatment In the link, the continuous biogas digester commonly used in the biogas industry is selected as the biogas digester for sludge treatment, and the sludge is sent to the continuous biogas digester, and methanogens are added to it. The methanogens can quickly produce biogas at relatively high temperatures; filtered After the waste water passes through the cracking furnace, it is heated by the cracking furnace. The cooling water heated by the cracking furnace is used to heat the sludge, which is more conducive to the generation of biogas. Under the combined action of relatively high temperature and methane bacteria, it can be used in a short time. The sludge produces biogas in a rapid and continuous manner; the biogas produced by the continuous biogas digester is stored in a container, and is transported to the paper mill's gas-requiring equipment such as boilers through pressure control and flow control as the fuel for the papermaking process; filtration made from cracked waste residue After the medium has been used for a certain period of time, it needs to be replaced regularly. The replaced slag of the saturated filtered wastewater is added to the cracking furnace as an additive for cracking plastics, which saves the cost of purchasing additives and prevents the waste from leaving the factory; after the sludge produces biogas The mud can be used as organic fertilizer. Because the mud contains a small amount of heavy metal ions, for safety reasons, only the sludge output from the continuous biogas digester can be used as fertilizer for ornamental plants. On the one hand, it can green the plant environment, and It provides a platform for the treatment of sludge, so that the waste does not go out.

[0018] Embodiment two, as in method two, in which step 1. sort waste plastics to remove impurities; 2. send the sorted waste plastics into a cracking furnace for cracking; 3. use the oil or natural gas produced after cracking as fuel 6. The sludge is sent to a continuous biogas digester, and methanogens are added to it. At the same time, the cooling water heated by the cracking furnace is used to heat the sludge to continuously produce biogas; 7. The biogas produced by the continuous biogas digester is used as Fuel for the papermaking process; 8. Re-add the replaced waste residue of the saturated filtered wastewater to the cracking furnace as an additive for cracking plastics; 9. Use the sludge output from the continuous biogas digester as fertilizer for ornamental plants; the same as the first embodiment , The step 4 is to compress the porous waste slag produced by the cracking furnace as a building material, such as building blocks, or mix it with other building materials to make prefabricated parts; step 5 is to add plant crushed material, plant crushed material and wastewater to the wastewater The paper-making fibers in the cellulose can produce cellulose after the mixing reaction. Cellulose is a material that can be sold as a commodity, which increases economic income.

[0019] Embodiment three, as in method three, step 1. sort waste plastics to remove impurities; 2. send the sorted waste plastics to a cracking furnace for cracking; 3. use the oil or natural gas produced after cracking as fuel; 4. Use the generated porous waste slag as a filter material waste water filter to filter the waste water; 5. Use the filtered waste water as the cooling water of the cracking furnace; the same as in example one; in this example, step 6 is used, that is It means that the water-containing sludge is added to the waste plastic and enters the cracking furnace. On the one hand, it reduces the need to spray water when the waste plastic is added to the cracking furnace. On the other hand, it increases the lubrication of the waste plastic. At the same time, the sludge is burned at high temperature. Remove the harmful substances contained inside.