LIUBo,ZHANGZi-geng,YUANHong-lin,et al.Floating Transportation Performance of Sodium Alginate-based Food Waste Microcapsule in Sewage Pipes[J].China Water & Wastewater,2025,41(19):66-73.
SA基厨余垃圾微胶囊在污水管道中的漂浮输送性能
- Title:
- Floating Transportation Performance of Sodium Alginate-based Food Waste Microcapsule in Sewage Pipes
- Keywords:
- food waste; sodium alginate; microcapsule; sewer pipe; carbon emissions
- 摘要:
- 在双碳背景下，将厨余垃圾（FW）从固体废物流转移到污水流是一项前景广阔的综合管理方案。然而，FW采用粉碎直排方式会显著加剧污水管道无序的温室气体（GHG）排放。为解决这一问题，利用海藻酸钠（SA）与Ca2+之间的快速反应制备微胶囊，并引入羟丙基甲基纤维素（HPMC）作为起泡剂，实现FW的漂浮输送。优化微胶囊的制备工艺，并在模拟管道水流条件下研究其综合性能，结果显示，微胶囊具有高包埋率、高载药量和较低的密度，在模拟管道环境下表现出良好的阻溶和漂浮效果。进一步通过场发射扫描电镜（SEM）分析微胶囊的形态和元素组成，证实了微胶囊能有效包埋FW。碳排放核算结果显示，当水力停留时间（HRT）为3 h和6 h时，FW微胶囊化方式相较于粉碎直排方式可使城镇排水管网的碳排放量分别降低75.60%和72.58%，这为城镇排水系统实现碳中和提供了新思路。
- Abstract:
- Transferring food waste (FW) from the solid waste stream to the wastewater stream represents a promising integrated management strategy within the context of dual carbon objectives. However, the process of pulverizing FW and discharging it directly into the sewer system may substantially intensify unregulated greenhouse gas (GHG) emissions originating from the sewer network. To address this issue, the rapid gelation reaction between sodium alginate (SA) and Ca2+ was utilized to fabricate microcapsules. Additionally, hydroxypropyl methylcellulose (HPMC) was incorporated as a foaming agent to enable the floating transportation of FW. By optimizing the preparation process of microcapsules and investigating their comprehensive properties under simulated pipeline water flow conditions, the resulting microcapsules exhibited a high embedding rate, high drug loading capacity, and low density. Additionally, they demonstrated excellent solubility inhibition and floating performance in the simulated pipeline environment. The morphology and elemental composition of the microcapsules were characterized using field emission scanning electron microscopy (SEM), confirming their ability to effectively encapsulate FW. The carbon emission calculation results indicated that microencapsulation reduced the carbon emissions of urban sewer network by 75.60% and 72.58% when the hydraulic retention time (HRT) was set to 3 hours and 6 hours, respectively, compared with pulverized direct discharge. This approach offers a novel strategy for achieving carbon neutrality in urban sewer system.
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