Method for reducing AOX emission in ECF bleaching process
An emission and pulp bleaching technology, applied in pulp bleaching, chemical process analysis/design, papermaking, etc., can solve problems such as increasing the cost of bleaching infrastructure
Active Publication Date: 2021-06-04
GUANGXI UNIV
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[0004] The researchers mentioned above realized the reduction of AOX emissions by changing the bleaching process or adding pretreatment links, but the above methods need to change the original bleaching equipment and increase the infrastructure cost of bleaching
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[0053] The present invention will be described in further detail below in conjunction with the embodiments and drawings, but the embodiments of the present invention are not limited thereto.
[0054] Such as figure 1 Shown, the embodiment of the present invention uses D 0 EpPD 1 Taking a typical ECF bleaching process as an example, a method for reducing AOX emissions in the ECF bleaching process described in the present invention is a modeling optimization method for reducing AOX emissions in pulp bleaching wastewater, including each bleaching unit in the pulp bleaching process The mathematical model of the pulp quality index after bleaching and the mathematical model of the AOX content in the bleaching wastewater of each bleaching stage; the system model of the pulp bleaching process is built according to the logical relationship between the mathematical models of each typical bleaching unit; the system model of the pulp bleaching process On the basis of the simulation anal...
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The invention discloses a method for reducing AOX emission in an ECF bleaching process. The method comprises the following steps: establishing mathematical models of various quality indexes of paper pulp bleaching units, including mathematical calculation models of whiteness, intrinsic viscosity and kappa number after paper pulp bleaching and AOX content calculation models of the bleaching units; establishing a paper pulp bleaching process system model, which comprises the whiteness, the intrinsic viscosity and the kappa number of paper pulp after final bleaching and the total discharge amount of AOX in wastewater after bleaching, wherein the optimized paper pulp bleaching process system model comprises an objective function with the lowest AOX emission and constraint conditions meeting quality requirements after paper pulp bleaching; and carrying out optimization solution by using an optimization process of a maximum and minimum function fminimax in a matlab optimization toolbox. According to the method, the discharge amount of AOX in the bleached wastewater can be reduced under the condition that the quality requirement of the bleached paper pulp is met, a new method is provided for treating the paper pulp bleaching wastewater, and the paper pulp bleaching benefit is improved.
Description
technical field [0001] The present invention relates to the technical field of reducing AOX content in pulp bleaching wastewater, in particular to establishing a mathematical optimization model; that is, establishing an optimization model with pulp bleaching quality indicators as constraints and the lowest AOX discharge in pulp bleaching wastewater as an objective function, A method for reducing AOX emissions in the ECF bleaching process. Background technique [0002] As a traditional manufacturing industry, the paper industry is often associated with high consumption of fresh water and generation of waste water with toxic components. Adsorbable organic halides (AOX) produced during bleaching may contain more than 300 different chlorinated organic compounds, some of which are highly carcinogenic, and most substances in AOX are lipophilic and can accumulate in organisms , and difficult to degrade. Therefore, many researchers proposed to achieve AOX emission reduction by cha...
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IPC IPC(8): G16C20/10D21C9/10
CPCG16C20/10D21C9/10D21C9/1052
Inventor 尹勇军陈绍旭马志超林婷婷陆晓丹周燕英
Owner GUANGXI UNIV