固定化小球藻对剩余污泥厌氧消化液的处理效能

王辉; 刘博; 杜丹丹; 朱泓霓; 翟鹏祥; 马江航; 张卓; 徐志嫱

doi:10.13205/j.hjgc.202506007

固定化小球藻对剩余污泥厌氧消化液的处理效能

doi: 10.13205/j.hjgc.202506007

王辉^1,2,
刘博²,
杜丹丹^2,3,
朱泓霓²,
翟鹏祥²,
马江航²,
张卓²,
徐志嫱^1,2, ,

1. 西安理工大学旱区水工程生态环境全国重点实验室, 西安 710048;
2. 西安理工大学水利水电学院, 西安 710048;
3. 杨凌职业技术学院, 陕西杨凌, 712100

基金项目:

陕西省重点研发计划项目（2024SF-YBXM-571）；国家自然科学基金项目（42107030）

详细信息

作者简介:
王辉（1986—），男，副教授，主要研究方向非传统污水处理技术。lwcq306@163.com

通讯作者:
徐志嫱（1969—），女，教授，主要研究方向为污水处理与资源化利用。476539251@qq.com

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出版历程
- 收稿日期: 2024-01-24
- 录用日期: 2024-08-06
- 修回日期: 2024-07-09

Treatment efficiency of residual sludge anaerobic digestate by immobilized Chlorella vulgaris

1. State Key Laboratory of Water Engineering Ecology and Environment in Arid Area, Xi'an University of Technology, Xi'an 710048, China;
2. School of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an 710048, China;
3. Yangling Vocational & Technical College, Yangling 712100, China

摘要

摘要: 固定化小球藻对剩余污泥厌氧消化液中的氮磷具有良好的去除效果，对剩余污泥的减量化处理具有重要意义。以海藻酸钠（SA）为载体、粉末活性炭（PAC）为吸附剂、氯化钙（CaCl₂）为交联剂，分析了3种物质的配比浓度对固定化小球藻传质性、稳定性、比生长速率等性能的影响，通过正交实验对固定化条件进行优化，研究固定化条件的最佳配比，及其对剩余污泥厌氧消化液中的氮磷处理效能。结果表明，当SA、PAC和CaCl₂的质量浓度分别为2.5%、4.5%、0.2%时，小球藻的比生长速率最佳，此时固定化小球藻对剩余污泥厌氧消化液中NH₄⁺-N、TP和COD的去除率分别可达96.70%、51.30%和52.92%，比悬浮态小球藻组分别高出3.13，17.05，8.53百分点。随着重复使用次数的增加，固定化小球藻的比生长速率和对厌氧消化液中NH₄⁺-N、COD和TP的去除率随之降低。此外，N/P、Ca²⁺浓度和COD浓度会影响固定化小球藻对剩余污泥厌氧消化液中氮、磷的去除效果。该研究结果可为剩余污泥厌氧消化液的处理提供理论支撑与技术参考。
- 海藻酸钠 /
- 粉末活性炭 /
- 固定化小球藻 /
- 污泥厌氧消化液 /
- 脱氮除磷
Abstract: The residual sludge anaerobic digestate is characterized by high nitrogen and phosphorus content and a low C/N ratio， which is not suitable for direct biological treatment. Microalgae can be used as a pre-treatment technology for residual sludge anaerobic digestate as a fast-growing， renewable source of biomass energy. The immobilized Chlorella vulgaris has a good performance in nitrogen and phosphorus removal in residual sludge anaerobic digestate. In this study， sodium alginate （SA） was used as a carrier， powdered activated carbon （PAC） as an adsorbent and calcium chloride （CaCl₂） as a cross-linking agent， and the effects of the proportional concentrations of the three additives on the properties of immobilized Chlorella vulgaris， such as mass transfer， stability and specific growth rate were analyzed. The immobilization conditions were optimized through orthogonal test to investigate the optimal proportions and effectiveness in nitrogen and phosphorus removal from residual sludge anaerobic digestate. The results showed that when the concentration of SA， PAC， and CaCl₂ was 2.5%， 4.5%， and 0.2%， the specific growth rate， material mass transfer， and mechanical properties of the immobilized Chlorella vulgaris were optimal. The removal efficiencies of NH₄⁺-N， TP， and COD by immobilized Chlorella vulgaris in the residual sludge anaerobic digestate were 96.70%， 51.30%， and 52.92%， which were 3.13%， 17.05%， and 8.53% higher than those of the suspension Chlorella vulgaris group， respectively. While the removal efficiencies of NH₄⁺-N， TP， and COD were only 22.93%， 14.89%， and 8.12% by the adsorption of PAC and SA without Chlorella vulgaris. As the reuse times increased， the specific growth rate of immobilized Chlorella vulgaris and the removal efficiencies of NH₄⁺-N， COD， and TP decreased. In addition， the removal efficiencies of TN and TP in the residual sludge anaerobic digestate by immobilized Chlorella vulgaris were affected by N/P ratio， and the concentration of Ca²⁺ and COD. When N/P ratio was 14：1， the removal efficiencies of TN and TP were the highest （91.23%， 86.54%）. With an increasing Ca²⁺ concentration， the algal density of immobilized Chlorella vulgaris showed an increasing-decreasing trend. When Ca²⁺ concentration was 0 to 20 mg/L， it had little effect on TN removal efficiency， while that of TP was positively correlated with Ca²⁺ concentration， and the best removal efficiency of TP was 90.0% when the Ca²⁺ concentration was 40 mg/L. When the COD concentration was 600 mg/L， the removal efficiencies of TN and TP were 84.39 % and 83.50 %， respectively， which were 46.24 and 11.75 percentage points higher than those of the 1200 mg/L COD group. The results can provide theoretical and technical support for the treatment of residual sludge anaerobic digestate.
- sodium alginate /
- powdered activated carbon /
- immobilized Chlorella vulgaris /
- residual sludge anaerobic digestate /
- nitrogen and phosphorus removal

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