生物炭作为海绵城市雨水滞留池填料的效果初探

生物炭吸附性强、抗氧化,在海绵城市建设中具有广阔的应用前景。通过模拟渗水实验,对土壤、生物炭和土壤生物炭混合物等对雨水吸持和净化效果进行研究。结果表明:以生物炭作为滞留池填料,具有较好的储水能力,储水量达0.45 mL/mL;能够缓冲酸性地表径流雨水的pH值,模拟雨水pH值从6.34提升至7.82;对雨水中总氮、总磷和铵氮的截留率分别为34.4%、48.0%和35.0%。因此,生物炭可作为海绵城市建设中雨水滞留池的新型填料。

Use of Biochar as the Filler for Rainwater Collection Pool for the Development of Sponge City

Biochar has broad application prospects in the construction of sponge city because of its strong ability of absorption and antioxidation. A simulation test on water penetration was conducted to examine the effectiveness of water absorption and puriifcation respectively by soil, biochar and the mixture of both. Results showed that iflling biochar in the rainwater collection pool resulted in a larger water-storage capacity up to 0.45 mL/mL. It can be used to buffer the pH value of acidic run-off water, increasing pH value of the simulated rain water from 6.34 to 7.82, and to remove TN, TP and NH4+ from the rain water by 34.4%, 48.0% and 35.0% respectively. Therefore, biochar can be used as a new type iflling material for rainwater collection pools for the construction of sponge city.