Treatment of nitrogen and phosphorus from sewage tailwater in paddy rice wetlands: concept and environmental benefits

文献类型： 外文期刊

第一作者： Ma, Rulong

作者： Ma, Rulong;Duan, Jingjing;Xue, Lihong;Yin, Aijing;Yang, Linzhang;Ma, Rulong;Suo, Quanyi;Petropoulos, Evangelos;Petropoulos, Evangelos

作者机构：

关键词： Domestic sewage; Tailwater reclamation; Paddy soil; Effluent reuse; Nitrogen and phosphorus removal; Ammonia volatilization

期刊名称：ENVIRONMENTAL MONITORING AND ASSESSMENT （ 影响因子：3.0； 五年影响因子：3.1 ）

ISSN： 0167-6369

年卷期： 2024 年 196 卷 2 期

页码：

收录情况： SCI

摘要： Domestic sewage tailwater (DSTW) reuse for crop irrigation is considered a promising practice to reduce water demand, mitigate water pollution, and substitute chemical fertilization. The level of the above environmental benefits of this water reuse strategy, especially when applied to paddy wetlands, remains unclear. In this study, soil column experiments were conducted to investigate the nitrogen and phosphorus fate in paddy wetlands subjected to different tailwater irrigation and drainage strategies, specifically, (i) TW1 and TW2 for regular or enhanced irrigation-drainage without N fertilization, (ii) TW3 and TW4 for regular irrigation with base or tillering N fertilizer, (iii) conventional fertilization N210, and (iv) no-fertilization controls N0. The results showed that the total nitrogen (TN), nitrate (NO3-), and total phosphorus (TP) removal rates from the paddies irrigated by DSTW ranged between 51.92 and 59.34%, 68.1 and 83.42%, and 85.69 and 86.98% respectively. Ammonia emissions from the DSTW-irrigated treatments were reduced by 14.6 similar to 47.2% compared to those paddies subjected to conventional fertilization (N210), similarly for TN emissions, with the exception of the TW2 treatment. Overall, it is established that the paddy wetland could effectively remove residual N and P from surface water runoffs, while the partial substitution of chemical fertilization by DSTW could be confirmed. The outcome of this study demonstrates that DSTW irrigation is a promising strategy for sustainable rice production with a minimized environmental impact.

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