化学机械法制浆全过程水污染源的等标污染负荷解析

Analysis of Equal-standard Pollution Load of Wastewater Pollution Sources in the Whole Process of Chemi-mechanical Pulping

关键词:  等标污染负荷法  制浆造纸  化学机械法制浆  制浆废水  污染源解析

Key Words:equal-standard pollution load method  pulp and paper  chemi-mechanical pulping  pulping wastewater  analysis of pollution sources

摘要:采用等标污染负荷法对化学机械法制浆过程各工序的废水量及主要特征水污染物种类、浓度和存在状态进行定量解析。结果表明，备料工序主要水污染物是COD、悬浮物（SS）和BOD；木片洗涤、挤压撕裂、螺旋压榨、筛选净化浓缩工序的主要水污染物是BOD、COD和SS；主要污染源集中在筛选净化浓缩和螺旋压榨工序，其中筛选净化浓缩工序等标污染负荷比为50.12%~51.17%，螺旋压榨工序为43.40%~44.21%，这2个工序等标污染负荷比累计达到90%以上；全过程主要水污染物为BOD、COD和SS，累计负荷比达到了80%以上，是废水治理的重点关注对象。该研究结果可为典型化学机械法制浆生产全过程水污染物的环境影响程度评价和管理控制提供有效依据。

Abstract:The equal-standard pollution load method was used to quantitatively analyze the amount of wastewater and the types， concentrations， and existing status of the main characteristic water pollutants in each process of the chemi-mechanical pulping. The results showed that the main water pollutants in the material preparation process were COD， suspended solids （SS） and BOD； the main water pollutants in the wood chip washing， extrusion and tearing， screw pressing， screening purification and concentration processes were BOD， COD and SS； the main pollution sources were concentrated in screening， purification， concentration and screw pressing， among them， the equal-standard pollution load ratio of the screening， purification and concentration process was 50.12%~51.17%， and the screw pressing process was 43.40%~44.21%， hence， the cumulative pollution load ratio of these two processes reached more than 90%； the main water pollutants in the whole processes were BOD， COD， and SS， and the cumulative load ratio had reached more than 80%， which was the focus of sewage treatment. The results of this study could provide an effective basis for environmental impact degree evaluation and management control of water pollutants in typical chemi-mechanical pulping process.