Ecological Engineering
Ecological Engineering
5 years ago

Floating ryegrass mat for the treatment of low-pollution wastewater

A floating ryegrass mat was constructed for low-pollution wastewater treatment during a low-temperature season. Plastic tanks were used as containers, and filled with low-pollution wastewater with low or high nitrogen concentrations, and with and without the floating ryegrass mat, creating four treatments in total (Group Low, Control Low, Group High and Control High). The experiment was conducted for 61 days. The results showed that the removal rates of TN, NH4 +, and NO3 − were considerably higher in Group Low and Group High than in the controls. The removal rates of TN were 86.8–88.8% in Group Low and 95.0–96.1% in Group High, while the removal rates of NH4 + were 91.1–92.5% in Group Low and 97.9–99.1% in Group High. Meanwhile, the COD values were in the range of 5.5–20.9mg/L in Group Low and 7.0–26.7mg/L in Group High, which were relatively higher compared to the controls. The higher COD/N ratios in Group Low and Group High might enhance nitrogen removal. Overall, the ratio of plant assimilation to TN input was estimated to be 33.0% and 47.6% in Group Low and Group High, respectively. The ryegrass mat displayed advantages such as easy transport and high seedling survival rate. The constructed floating ryegrass mat effectively reduced nitrogen concentration. Therefore, this technique can be an alternative approach for low-pollution wastewater treatment.

Publisher URL: www.sciencedirect.com/science

DOI: S0925857417304536

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.