Experimental Study on Oyster Shell Modification and Combined Oxygen Release Composite Materials for Remediation of Ammonia Nitrogen Pollution in Groundwater

doi:10.19657/j.geoscience.1000-8527.2021.073

Abstract

Abstract:

Laboratory experiments were carried out on the performance and economic applicability of permeable reactive barrier filled with modified oyster shell-oxygen releasing composite material, with the aim to mitigate groundwater ammonia nitrogen pollution. Calcium peroxide was used as the oxygen-releasing compound, and mixed with cement, quartz sand/oyster-shell grain and calcium bentonite in a certain proportion, in order to make a spherical oxygen-releasing material with about 1.8 cm particle size. Finally, we studied the groundwater ammonia nitrogen repairing effects and their economic feasibility of two different size oyster-shell oxygen-releasing composite materials, and those of different adsorbent materials under different oxygen supply modes. The results indicate that the high-temperature modification of oyster-shell particles could not improve the comparative area of oyster shell. The specific surface area of oyster shell decreases with increasing calcination temperature and aggregation occurred. During the 95-day experiment, the dissolved oxygen of each experimental column was maintained at about 18 mg/L, and the basophilic bacterial action reduced the pH effectively. The oxygen-releasing material produced could provide the oxygen for the nitrifying bacterial growth in groundwater with low dissolved-oxygen for a long period of time. By the nitrification of alkali-resistant nitrifying bacteria, the permeable reactive barrier filled with oyster shell oxygen-releasing composite material could reduce the ammonia nitrogen concentration from 50 to 35 mg/L, whilst the repairing effect by oyster shell particles of different sizes is unobvious. In the long term, it is more economical to use oyster shells as adsorbents, and to use oxygen-releasing materials as oxygen supply. The use of the permeable reactive barrier (filled with modified oyster shell-oxygen) releasing composite material for long-term groundwater ammonia nitrogen repair is both effective and economical with activated carbon and zeolite framework.

Key words: modification of oyster shell, oxygen-releasing material, permeable reactive barrier, groundwater, ammonia remediation

CLC Number:

P641.1
X52

WU Fuxian, LI Wei, LI Shuiyun, CHEN Xiaodan, XIE Linshen, CHENG Gong, CHANG Xu, CHEN Chunxing, HAN Long. Experimental Study on Oyster Shell Modification and Combined Oxygen Release Composite Materials for Remediation of Ammonia Nitrogen Pollution in Groundwater[J]. Geoscience, 2022, 36(02): 583-590.

Figures/Tables 14

References 16

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序号	粒径/ mm	煅烧温度/℃	煅烧时间/min	比表面积/ (m²/g)
1	<0.1	0	0	3.86
3	0.1~0.3	0	0	2.18
4	0.1~0.3	100	60	2.17
5	0.1~0.3	150	60	2.22
6	0.1~0.3	200	60	1.88
7	0.1~0.3	400	60	1.07
9	0.1~0.3	700	60	0.34
11	0.1~0.3	800	60	0.75
12	0.1~0.3	900	60	0.74
13	0.1~0.3	1 000	60	0.72
15	0.1~0.3	1 100	60	0.65
16	0.1~0.3	1 150	60	0.56
17	0.1~0.3	1 200	60	0.50
18	0.3~0.6	0	0	1.34
19	0.6~0.9	0	0	0.83

序号	粒径/ mm	煅烧温度/℃	煅烧时间/min	比表面积/ (m²/g)
1	<0.1	0	0	3.86
3	0.1~0.3	0	0	2.18
4	0.1~0.3	100	60	2.17
5	0.1~0.3	150	60	2.22
6	0.1~0.3	200	60	1.88
7	0.1~0.3	400	60	1.07
9	0.1~0.3	700	60	0.34
11	0.1~0.3	800	60	0.75
12	0.1~0.3	900	60	0.74
13	0.1~0.3	1 000	60	0.72
15	0.1~0.3	1 100	60	0.65
16	0.1~0.3	1 150	60	0.56
17	0.1~0.3	1 200	60	0.50
18	0.3~0.6	0	0	1.34
19	0.6~0.9	0	0	0.83

原料编号	过氧化钙	水泥	石英砂/牡蛎壳粒	钙基膨润土
1号	1.4	1.4	1(石英砂)	1
2号	1.4	2.0	1(石英砂)	1
3号	1.4	2.8	1(石英砂)	1
4号	1.4	1.4	1(石英砂)	1.48
5号	1.4	1.4	1(牡蛎壳粒)	1

原料编号	过氧化钙	水泥	石英砂/牡蛎壳粒	钙基膨润土
1号	1.4	1.4	1(石英砂)	1
2号	1.4	2.0	1(石英砂)	1
3号	1.4	2.8	1(石英砂)	1
4号	1.4	1.4	1(石英砂)	1.48
5号	1.4	1.4	1(牡蛎壳粒)	1

编号	第一层			第二层
编号	介质	厚度/cm	用量/g	介质	厚度/cm	用量/g
柱A	石英砂	2	301.8	牡蛎壳 (0.1~0.3 mm)	24	679.5
柱A	石英砂	2	301.8	释氧材料	24	1 493.6
柱B	石英砂	2	300.8	牡蛎壳粒 (0.6~0.9 mm)	24	811.9
柱B	石英砂	2	300.8	释氧材料	24	1 492.7