石灰软化法中海藻酸钠强化去除脱硫废水中的SO<sub>4</sub><sup>2-</sup>

王锐; 李永立; 张洪江; 宫延哲; 胡彬; 陈希

doi:10.13205/j.hjgc.202303004

石灰软化法中海藻酸钠强化去除脱硫废水中的SO₄^2-

doi: 10.13205/j.hjgc.202303004

王锐¹,
李永立¹,
张洪江¹,
宫延哲²,
胡彬²,
陈希^2, ,

1. 华北电力科学研究院有限责任公司, 北京 100045;
2. 西安工程大学城市规划与市政工程学院, 西安 710048

基金项目:

陕西省自然科学基金项目(2021JQ-690)

详细信息

作者简介:
王锐(1975-),男,高级工程师,主要研究方向为电厂水处理。wr_66@sina.cn

通讯作者:
陈希(1985-),女,讲师,主要研究方向为污水处理与资源化。Xi_Chen2011@126.com

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出版历程
- 收稿日期: 2021-11-10
- 网络出版日期: 2023-05-26
- 刊出日期: 2023-03-01

ENHANCEMENT OF SO₄^2- REMOVAL BY SODIUM ALGINATE IN LIME SOFTENING PROCESS OF DESULFURIZATION WASTEWATER

1. North China Electric Power Research Institute Co., Ltd, Beijing 100045, China;
2. School of Urban Planning and Municipal Engineering, Xi'an Polytechnic University, Xi'an 710048, China

摘要

摘要: 以实际脱硫废水为原水,在不同石灰乳、聚合硫酸铁、海藻酸钠的复配条件下,对混凝沉淀后溶液SO₄^2-浓度、pH值、Zeta电位及矾花粒径、表面形貌、官能团和晶体结构等进行分析,探索石灰软化法中海藻酸钠强化SO₄^2-去除机理。结果表明:相比于同时投加7 g/L石灰和40 mg/L聚合硫酸铁,复配海藻酸钠可使出水SO₄^2-浓度由3991.15 mg/L降低至3238.60 mg/L(均值),pH值(均值)由9.66升高至9.69。海藻酸钠通过吸附电中和及吸附架桥作用促进胶粒的聚集,在投加量为3 mg/L时形成中值粒径30.41 μm的矾花。投加海藻酸钠形成的CaSO₄晶体更加规整,晶簇较为细小但极为密集,强化了SO₄^2-去除。红外光谱和X射线衍射分析表明,海藻酸钠的羧基(-COO^-)可能通过螯合Ca²⁺等金属离子促进石灰溶解,从而使CaSO₄结晶效果更好。正交实验结果显示,去除SO₄^2-较适宜的复配组合为石灰7 g/L+聚合硫酸铁30 mg/L+海藻酸钠2 mg/L,SO₄^2-去除率可达到80.94%。
- 海藻酸钠 /
- 脱硫废水 /
- 硫酸根 /
- 扫描电镜 /
- 红外光谱
Abstract: The mechanism of SO₄^2- removal enhanced by sodium alginate in the lime softening method was explored in this study, by treating the actual desulfurization wastewater with different combinations of lime milk, polymeric ferric sulfate and sodium alginate, through analyzing the SO₄^2- concentration, pH value, Zeta potential, particle size, surface morphology, functional groups and crystal structure after coagulation. The results showed that compared with the dosing of 7 g/L lime and 40 mg/L polymerized iron sulfate at the same time, compounding with sodium alginate could make the SO₄^2- concentration in the effluent decrease from 3991.15 mg/L to 3238.60 mg/L (mean value), and the pH value increase from 9.66 to 9.69 (mean value). Sodium alginate promoted the aggregation of the colloids through the adsorption charge neutralization and adsorption bridging mechanisms, and formed flocs with a median particle size of 30.41 μm at a dosage of 3 mg/L. By adding sodium alginate into the system, the formed CaSO₄ crystals were more regular, and the crystal clusters were relatively smaller but quite dense, thus enhancing the removal of SO₄^2-. The infrared spectroscopy and X-ray diffraction analysis indicated that, the carboxyl group (—COO^-) of the sodium alginate might facilitate the dissolution of lime by chelating the metal ions such as Ca²⁺, and the crystallization of CaSO₄ was better. The orthogonal experiment results showed that the suitable compound for SO₄^2- removal was composed of 7 g/L of lime, 30 mg/L of polymeric ferric sulfate and 2 mg/L of sodium alginate, and then the removal efficiency was 80.94%.
- sodium alginate /
- desulfurization wastewater /
- sulfate ion /
- SEM /
- FTIR

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