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| Removal effect of Pistia stratiotes on major pollutants in milking parlor wastewater |
| Received:March 07, 2022 |
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| KeyWord:Pistia stratiotes;milking parlor wastewater;tolerance;removal effect |
| Author Name | Affiliation | E-mail | | LIU Heying | College of Resources and Environment, Northeast Agricultural University, Harbin 150036, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Man | College of Resources and Environment, Northeast Agricultural University, Harbin 150036, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHAI Zhongwei | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | YANG Peng | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHI Suli | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | SHEN Shizhou | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Dali Observation and Experimental Station of National Agricultural Environment, Dali 671004, China | | | ZHANG Keqiang | College of Resources and Environment, Northeast Agricultural University, Harbin 150036, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Dali Observation and Experimental Station of National Agricultural Environment, Dali 671004, China | keqiangzhang68@163.com |
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| Abstract: |
| To explore a novel method of milking parlor wastewater treatment with lower cost and more efficient purification effect, the present study conducted an indoor experiment using Pistia stratiotes for the purification of raw milking parlor wastewater or wastewater treated anaerobically or aerobically. The study focused on the tolerance concentration threshold of Pistia stratiotes to major salts in milking parlor wastewater as well as its removal effect on basic nutrients, such as total nitrogen（TN）and total phosphorus（TP）, chemical oxygen demand（COD）, and anionic salts, such as SO42- or Cl-, in wastewater following purification. Pistia stratiotes was tolerant of major salts in milking parlor wastewater when the electrical conductivity of raw wastewater was below 2 193-2 527 μS·cm-1. However, the activities of antioxidant enzymes in Pistia stratiotes were inhibited when the SO42- and Cl- levels exceeded 5 mmol·L-1 and 15~25 mmol·L-1, respectively. During purification of the three types of milking parlor wastewater, Pistia stratiotes produced the strongest reducing effect on COD, resulting in 65.51%-86.75% less of the substance in wastewater. TN, NH4+-N, and TP decreased by 69.46%-87.52%, 64.00%-96.59%, and 30.73%-66.02%, respectively, while SO42- and Cl-levels decreased by 16.37%-18.04% and 22.02%-35.83%, respectively. Additionally, Pistia stratiotes produced the best removal effects on many pollutants in raw and anaerobically treated wastewater for 23 days. Specifically, the removal effect of Pistia stratiotes on TN, NH4+-N, total organic carbon, SO42-, and Cl- was improved by respectively 9.60%, 42.83%, 40.94%, 2.00%, and 13.81% in anaerobically treated wastewater compared with that in raw wastewater. Therefore, Pistia stratiotes is tolerant of major salts in milking parlor wastewater, and plant purification can effectively reduce primary pollutants levels in this type of wastewater following anaerobic treatment. |
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