【摘要】：針對南方某市歷年來與錳相關的多次黃水問題,在當?shù)攸S水多發(fā)區(qū)域挖取10年管齡的舊PE管和20年管齡的鍍鋅鋼管,搭建中試裝置,開展了管網(wǎng)中錳釋放行為的中試研究,并以新PE管做對比,探討了微生物對管網(wǎng)內(nèi)錳的氧化沉積的影響。實驗結果表明,在進水錳濃度很低時,鍍鋅鋼管與舊PE管的管壁沉積物中均會出現(xiàn)錳的釋放。鍍鋅鋼管中釋放的錳主要為溶解性錳,釋放量大;而舊PE管中釋放的錳主要為不溶態(tài)的錳,且釋放量小。同時,鍍鋅鋼管管道浸泡結果表明,隨著余氯濃度的提高,鍍鋅鋼管中溶解錳的釋放會顯著降低,但即使余氯濃度高達15 mg·L~(-1)仍會有25.3μg·L-1的溶解錳的釋放。新舊PE管的對比實驗表明,當提高進水Mn(Ⅱ)濃度時,舊PE管中Mn(Ⅱ)在6.67 h內(nèi)的氧化量低于新PE管,這可能是舊PE管生物膜中的錳還原菌含量較多導致的。
[Abstract]:In view of the manganese-related yellow water problems in a certain city of southern China over the years, the old PE pipe of 10 years old and the galvanized steel pipe of 20 years old were excavated in the local yellow water prone area, and the pilot-scale test device was set up, and the pilot-scale study of manganese release behavior in the pipe network was carried out. The effect of microorganism on manganese oxidation deposition in pipe network was discussed by comparison with new PE tube. The experimental results show that manganese release occurs in the sediment of galvanized steel pipe and old PE tube when the influent manganese concentration is very low. The main manganese released in galvanized steel pipe is dissolved manganese, and the amount of manganese released in the old PE tube is mainly insoluble, and the release amount is small. At the same time, the results of immersion in galvanized steel pipe show that the release of dissolved manganese in galvanized steel pipe decreases significantly with the increase of residual chlorine concentration. But even if the residual chlorine concentration is as high as 15 mg L ~ (-1), there will still be 25.3 渭 g L ~ (-1) release of dissolved manganese. The comparison of the new and the old PE tubes showed that when the influent concentration of Mn (鈪，

本文編號：2343918