研究论文
陈逸帆,张弛,王书月,徐新华,程丽华.生物矿化促进造纸废水好氧除钙的技术研究[J].环境科学学报,2020,40(3):922-929
生物矿化促进造纸废水好氧除钙的技术研究
- Enhanced aerobic calcium removal from papermaking wastewater by biomineralization
- 基金项目：国家水体污染控制与治理科技重大专项（No.2017ZX07206-002）
- 作者
- 单位
- 陈逸帆
- 浙江大学环境与资源学院, 杭州 310058
- 张弛
- 浙江大学环境与资源学院, 杭州 310058
- 王书月
- 浙江大学环境与资源学院, 杭州 310058
- 徐新华
- 浙江大学环境与资源学院, 杭州 310058
- 程丽华
- 浙江大学环境与资源学院, 杭州 310058
- 摘要：造纸废水厌氧出水中钙离子浓度高，容易引起后续活性污泥好氧曝气系统钙化，造成生化处理能力下降.本文利用富含产脲酶菌的驯化污泥对模拟厌氧出水进行生物矿化除钙.在序批式反应器中接种驯化污泥，在一定尿素浓度下研究除钙过程，并考察曝气对除钙过程的影响.结果表明，当尿素投加量为0.5 g·L-1时，不曝气条件下钙和有机物去除率分别达到50%和35%左右；曝气有利于吹脱二氧化碳，当曝气量为0.2 L·min-1时，钙离子和有机物去除率均上升至80%左右，而持续提高曝气量无法进一步提高有机物去除率.综合运行成本和处理要求，曝气辅助生物矿化可以有效去除造纸废水厌氧出水中的溶解性钙离子.通过基因组测序发现驯化污泥中产脲酶功能菌主要来自厚壁菌门，特别是芽孢杆菌纲中的热杆菌属.
- Abstract：High concentration of calcium ion in anaerobic effluent of papermaking wastewater has caused serious calcification in the downstream activated sludge aerobic system, resulting in a decrease in biological treatment efficiency. In this study, the biomineralization, as an effective process for removing calcium from simulated anaerobic effluent with the cultivated sludge rich in urease-producing microorganisms, was proposed. The effect of urea addition and aeration on the calcium removal process were then investigated in sequencing batch reactors inoculated with cultivated sludge. The results show that appropriate aeration could not only promote the growth of urease-producing bacteria, but also enhance the stripping of carbon dioxide. When reactors were dosed with urea to a concentration of 0.5 g·L-1, the removal of calcium and organic matter increased from 50% and 35% to both 80% when aerated with 0.2 L·min-1, respectively. Further increase in aeration, nevertheless, would not improve the organic matter removal. Taking operational cost and treatment requirements into consideration, the biomineralization assisted by aeration can remove calcium ions from anaerobic effluent of papermaking wastewater effectively. DNA sequencing results show that the urease-producing microorganisms in acclimated sludge are mainly from the phylum Firmicutes, especially from the genus Thermicanus in Class Bacillus.
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