Floating Constructed Wetlands Efficiency in Removal of Total Hardness, Calcium and Magnesium from Secondary Treated Sewage Water

INTERNATIONAL JOURNAL OF PLANT AND ENVIRONMENT Pub Date : 2023-09-28 DOI:10.18811/ijpen.v9i03.13

Monika Kumari, Vinay Kumar, Bindu Sharma

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Abstract

Floating Constructed wetlands (FCWs) also popular as Floating Treatment Wetlands (FTWs) were used in situ for suspended solids,heavy metals, biological oxygen demand (BOD), chemical oxygen demand (COD), faecal coliform bacteria, nutrients and heavy metalsremediation from various types of wastewater. However, there was limited data available on total hardness (TH), calcium (Ca2+) andmagnesium (Mg2+) ions removal from secondary treated sewage water (STSW). This article focuses on TH, Ca2+ and Mg2+ ions removalefficiency of FCWs from STSW. Mesocosms include a control (without FCWs), FCWs planted with macrophyte plant species Cannaindica var. indica L. (S1) and Typha angustifolia L. (S2) and one mixed culture with both Typha and Canna plants (S3). The changes in TH,Ca2+ and Mg2+ concentration in wastewater were recorded at a 7-day hydraulic retention time (HRT) for 7 batches. Mean percentageremoval efficiency recorded was 9.8, 1.7, 4.9 and 11.2% for TH, -3.4, 7.6, 27.1 and 14.1% for Ca2+and 29.5, 4.2, -0.6, and -0.6% for Mg2+,in Control, S1, S2, S3 FCWs respectively. Results showed that S2 and S3 FCWs are effective in TH and Ca2+ removal but not for Mg2+ ions.Thus, FCWs can reduce TH and Ca2+ ions concentration along with nutrients from STSW.

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漂浮式人工湿地去除二级处理污水中总硬度、钙和镁的效率

浮动建造湿地（FCWs）也被称为浮动处理湿地（FTWs），用于就地处理各类废水中的悬浮固体、重金属、生物需氧量（BOD）、化学需氧量（COD）、粪大肠菌群、营养物质和重金属。然而，从二级处理污水（STSW）中去除总硬度（TH）、钙离子（Ca2+）和镁离子（Mg2+）的数据却很有限。本文主要研究 FCWs 对 STSW 中总硬度、Ca2+ 和 Mg2+ 离子的去除效率。介观模型包括对照组（无 FCWs）、种植有大型植物 Cannaindica var. indica L. （S1）和 Typha angustifolia L. （S2）的 FCWs，以及同时种植有 Typha 和 Canna 植物的混合培养（S3）。在 7 天的水力停留时间（HRT）内，记录了 7 批废水中 TH、Ca2+ 和 Mg2+ 浓度的变化。在对照组、S1、S2 和 S3 FCWs 中，TH 的平均去除率分别为 9.8%、1.7%、4.9% 和 11.2%，Ca2+ 的平均去除率分别为 -3.4%、7.6%、27.1% 和 14.1%，Mg2+ 的平均去除率分别为 29.5%、4.2%、-0.6% 和 -0.6%。结果表明，S2 和 S3 FCWs 能有效去除 TH 和 Ca2+，但不能有效去除 Mg2+。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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INTERNATIONAL JOURNAL OF PLANT AND ENVIRONMENT

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