Non-process sealing circulation technology for wastewater from pulp and paper making by non-delignify reaction

Abstract

The invention provides a closed circulation technology of untreated wastewater of non-delignification reaction pulp and paper and mainly adjusts and reforms a pulp and paper system of the non-delignification reaction to adapt a segment short process closed circulation reuse which is processed to discharge wastewater without chemical, biochemical treatment in a production process of pulp and paper, and to control added quantity of clear water which is the same as the demanded water consumption of the pulp and paper process (namely a sum of evaporated water of a dryer section of paper machine and carried water in impurities which is separated when the paper machine pulps); therefore, wastewater can not be discharged outward, and water consumption per ton production during the production process of pulp and paper is greatly reduced.

Description

1. Technical field [0001] This technology relates to a clean production technology of pulping and papermaking, especially in the pulping and papermaking process without delignification reaction (that is, the pulping and papermaking production process using waste paper, commercial pulp, mechanical pulp and other types of fibers as raw materials) The discharged wastewater is directly closed and recycled without chemical or biochemical treatment, and it is a clean production technology that does not discharge wastewater outside. 2. Background technology [0002] In the pulping and papermaking process without delignification reaction, a certain amount of waste water and waste residue will be produced. If these waste water and waste residue are discharged directly without treatment, they will cause serious pollution to the environment. The waste slag produced in the process of pulping and papermaking without delignification reaction includes various heavy impurities such as iron ...

AI Technical Summary

Problems solved by technology

The disadvantages of this method of purifying wastewater for reuse or discharge up to standard are that a huge wastewater purification treatment system needs to be set up, and a large amount of daily operating costs are required, and a large amount of papermaking sludge is difficult to handle, which greatly increases the cost of pulping. Equipment investment and production cost of papermaking enterprises

Therefore, most pulping and papermaking enterprises without delignification reaction are not enthusiastic about the reuse of this kind of wastewater after purification treatment. In order to reduce production costs, enterprises secretly discharge pulping and papermaking wastewater without purification treatment as much as possible.

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