What are the characteristics and principles of the paper mill production wastewater reuse process-Oc

What are the characteristics and principles of the paper mill production wastewater reuse process?

by:Ocpuritech     2021-03-22
What are the characteristics and principles of the paper mill production wastewater reuse process? Author: With the improvement of the country's industrialization, industrial production also increased mill, paper mill waste water emissions were increasing. Harm to the environment and constraints on economic development have become the 'negative effects' of industrial development on GDP growth. In the face of such a severe situation, some industrially developed countries have taken technical measures for zero discharge of wastewater from paper mills. Membrane filtration technology is commonly used in bleaching workshops to reduce the organic matter in the system, it can also be used to reduce the content of non-process elements in recycled water, and it can also be used to remove chlorine in bleaching wastewater. Membrane filtration technology uses semi-permeable membranes to separate molecules from liquids. It is mainly divided into two categories: voltage-driven and pressure-driven. Due to the large amount of waste liquid processed in bleaching workshops, the commonly used method is pressure-based driving, including micro Filtration, ultrafiltration, nanofiltration and reverse osmosis. Their basic principle is to use pressure to separate molecules according to their relative molecular masses. Molecules with low relative molecular weight pass through the membrane to become permeate, which can be recycled and reused, ultimately achieving zero waste water discharge. Analysis of the characteristics of wastewater from paper mills: To achieve wastewater reuse, first determine the quality of the reused water, including water quality and water quantity. On this basis, consider the feasibility of the reuse process, as well as factors such as investment, operating costs, and equipment maintenance. The treatment plan ensures the efficient, stable and reliable operation of the system, and achieves greater economic benefits. The method to improve the recovery rate of reverse osmosis: the paper mill wastewater 'sub-zero discharge' (CMLZD) process, which is based on the water quality characteristics of chemical treatment and special membrane filtration and membrane separation and other water treatment technologies, organic combination of integrated water treatment process, The system recovery rate reaches about 95%. (1) The cross-flow softening filtration (TCMF) pretreatment unit controls the pH within a specific alkaline range, and adds a certain amount of precipitant to the reaction tank according to the water quality conditions. (2) TCMF membrane filtration unit, through a special membrane filtration to remove fouling substances and pollutants, the substances trapped by the filtration membrane are sent back to the reaction tank by cross-flow circulating water, and the sediments therein are discharged. (3) In the salt concentration reverse osmosis (HCRO) membrane separation unit, the RO membrane is specially treated to withstand ultra-low pressure, acid and alkali, and oxidation. To achieve the goal of 'zero discharge' of wastewater from the paper mill, the wastewater from the paper mill must be deeply treated and reused. It is more economical and feasible to use reverse osmosis technology to treat the large amount of wastewater and complex water quality in the paper mill. In order to improve the recovery rate of reverse osmosis, the HERO process can be used to reasonably pretreat the RO influent, or the CMLZD process can be used to organically combine chemical treatment with special membrane filtration and membrane separation technologies, and then use evaporation or crystallization technology to treat the residual liquid It is collected and buried as a solid, realizing zero discharge of paper mill wastewater.
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