1. Industry background

Paper industry wastewater refers to the wastewater produced in the process of pulp and paper production. Paper industry production is divided into two main process stages, namely pulping and paper making. Pulping is the separation of fibers in plant raw materials, made into pulp, and then bleached; Papermaking is to dilute, shape, press and dry the pulp to make paper. Both processes use a lot of water, much of which is discharged as wastewater.

2. Difficulties in governance

The sewage of papermaking industry accounts for a large proportion in the whole industrial wastewater and is seriously polluted. Sewage types include: pulping wastewater, pulp washing, screening, bleaching and other sections of the middle wastewater and paper waste water.

Paper industry wastewater is a serious source of pollution, discharge of large, serious pollution to the surrounding and ecological environment damage can not be ignored, the serious pollution and harm of paper industry wastewater has caused widespread concern.

3. Description of comprehensive treatment plan

At present, by improving the bleaching technology of papermaking raw materials, increasing the pre-bleaching stage of biological enzymes and switching to singlet oxygen enhanced alkali extraction bleaching technology, the discharge of intermediate wastewater and pollutants is reduced.

At the same time, the anaerobic and aerobic biological treatment technology is adopted in the wastewater treatment section, the chemical flocculation precipitation method and the double polymerization system are adopted in the three-stage treatment, and the high-tech filter device such as self-cleaning filter is used in the system, which further reduces the turbidity and color of the wastewater, and the water recovery rate reaches 80%, realizing the efficient utilization of the wastewater resource.

Although in the process of wastewater treatment in the paper industry, self-cleaning filter is not the most important means of treatment, but it is indispensable, all the wastewater must be filtered through the self-cleaning filter to achieve the reduction of wastewater turbidity and chroma, to achieve the wastewater recovery of 80% of the expected value, in order to realize the efficient utilization of wastewater resources.

Self-cleaning filter is also widely used in the field of paper making, its main purpose is to recycle the waste water produced in the process of paper making, reduce the waste of pulp fiber.

4. Introduction of relevant equipment

General paper mills in the production process, in order to solve the production cost, will be the nearest water, such as rivers, lakes, etc. And papermaking is required for the purity of water. This is not a problem for fully automatic self-cleaning filters.

Self-cleaning filter can take the water from the inlet into the filter cylinder body, first of all, by the coarse filter will be in the water mass debris filter out, into the fine filter screen for precision filtration, so that you can meet the needs of paper making clean water.

The self-cleaning filter itself has the advantages of low cost, easy operation, simple working principle, high precision filter screen, large area, small system pressure loss area and many other characteristics, which can fully filter the suspended particles in the water body and reduce the damage degree of paper making equipment.

5. Effect analysis

The self-cleaning filter can provide sewage treatment solutions for many industries and has been widely praised by enterprises. The equipment is a very reliable water treatment equipment for paper mills.