Li Yu-Ping, Jiang Ying-Ying, Liu Bao-Ming, Ruan Wen-Quan, Miao Heng-Feng
School of Environmental & Civil Engineering, Jiangnan University, Wuxi 214122, China.
Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China.
Huan Jing Ke Xue. 2020 Aug 8;41(8):3629-3636. doi: 10.13227/j.hjkx.201912207.
The internal source pollution of sediment is the main factor leading to the repetition of black-odorous river channels. In order to prevent this situation, a river channel in the Binhu District of Wuxi City was used as an experimental site. In-situ CaO combined with a biochar covering technology was used to repair the black odorous river sediment in this channel. The effects of this technology on the quality of mud water, sedimentary volatile sulfide (AVS) and phosphorus forms, microorganisms, and restoration of black odorous sediment were investigated. The results showed that CaO combined with biochar coverage could significantly increase the dissolved oxygen (DO) concentration and redox potential (ORP) of the muddy water system. The DO concentration and ORP in the overlying water were maintained above 2 mg·L and 50 mV, respectively. The removal rates of interstitial water ammonia-nitrogen (NH-N), chemical oxygen demand (COD), and total phosphorus (TP) reached 43.40%, 41.18%, and 50.97%, respectively. The removal rate of AVS in the sediment reached 37.03%. The high-throughput sequencing showed that the relative abundance of anaerobic microorganisms in the sediment was significantly reduced, and that nitrogen and sulfur removal microorganisms appeared (e.g., , , , , and ). Phosphorus in the sediment was converted into Fe/Al-P and Ca-P. Therefore, in-situ CaO combined with biochar coverage had a good repairing effect on black odorous sediment.
沉积物内源污染是导致黑臭河道反复出现的主要因素。为防止这种情况，以无锡市滨湖区的一条河道为试验场地，采用原位CaO联合生物炭覆盖技术修复该河道黑臭底泥，考察该技术对泥水水质、沉积态挥发性硫化物（AVS）及磷形态、微生物以及黑臭底泥修复效果的影响。结果表明，CaO联合生物炭覆盖可显著提高泥水体系的溶解氧（DO）浓度和氧化还原电位（ORP），上覆水中DO浓度和ORP分别维持在2 mg·L以上和50 mV以上，间隙水氨氮（NH-N）、化学需氧量（COD）和总磷（TP）的去除率分别达到43.40%、41.18%和50.97%，沉积物中AVS的去除率达到37.03%。高通量测序表明，沉积物中厌氧微生物的相对丰度显著降低，出现了氮硫去除微生物（如 、 、 、 、 ），沉积物中的磷转化为Fe/Al-P和Ca-P。因此，原位CaO联合生物炭覆盖对黑臭底泥具有良好的修复效果。
