Centre for Water Management and Reuse, School of Natural and Built Environments, University of South Australia, Mawson Lakes Boulevard, Mawson Lakes, South Australia, 5095.
Water Sci Technol. 2011;63(3):491-501. doi: 10.2166/wst.2011.248.
The use of coagulation and flocculation for tertiary treatment of pulp and paper mill effluent was investigated, where the evaluation was based on the removal of nitrogen (N), phosphorus (P) and BOD from post-coagulated wastewater. The study was undertaken on laboratory scale aerobic stabilisation basins (ASB). Two post coagulated (alum) wastewaters were studied, where the BOD:N:P ratios were 100:1.3:0.06 and 100:1.3:0.3. These wastewaters were treated in two identical concurrent simulations (A & B). The influent ratio for 'A' was selected representing the composition of actual coagulated Pinus radiata sulfite pulp effluent mixed with paper mill effluent. The input composition for 'B' represented a typical P concentration found in existing pulp and paper mill effluents. Unmodified sludge collected from a mill-pond was added at 4% v/v to each simulation replicating the treatment conditions at full-scale. Similar high percentage removals of BOD and COD occurred after 28 days (two HRTs) which were 94 and 67% respectively for 'A', and 98 and 70% respectively for 'B', where both remained at steady state during the third HRT. A statistical analysis of the data revealed that there was no significant difference in the sample variance of the BOD and COD results.
采用混凝和絮凝法对制浆造纸厂废水进行三级处理，评价指标为经混凝后的废水中氮（N）、磷（P）和生化需氧量（BOD）的去除率。研究在实验室规模的好氧稳定池（ASB）中进行。研究了两种经后混凝（硫酸铝）处理的废水，其 BOD:N:P 比值分别为 100:1.3:0.06 和 100:1.3:0.3。这两种废水在两个相同的平行模拟（A 和 B）中进行处理。“A”的进水比例代表实际经混凝的松木亚硫酸盐浆废水与造纸厂废水混合后的组成。“B”的进水组成代表现有纸浆和造纸厂废水中发现的典型 P 浓度。将取自工厂池塘的未经改性的污泥以 4%v/v 的比例添加到每个模拟中，模拟了全规模处理条件。在 28 天（两个水力停留时间）后，A 组的 BOD 和 COD 去除率均达到了 94%和 67%，B 组分别达到了 98%和 70%，在第三个水力停留时间内均达到了稳定状态。对数据的统计分析表明，BOD 和 COD 结果的样本方差没有显著差异。
