废水
致病菌
厚壁菌
沉积作用
军团菌
总悬浮物
环境科学
拟杆菌
细菌
污水处理
微生物学
生物
环境工程
制浆造纸工业
沉积物
化学需氧量
工程类
16S核糖体RNA
古生物学
遗传学
作者
Wenkai Li,Hongwei Lei,Yue Han,Ming Lei,Tianlong Zheng
标识
DOI:10.1061/(asce)ee.1943-7870.0002019
摘要
Truck-wash facilities have become popularized globally on construction sites, and the wastewater was frequently treated by three-stage sedimentation basins. The wastewater and bacterial characteristics in three-stage sedimentation basins need to be studied, which might affect the treatment cost and reuse security. In this study, the wastewater characteristics, bacterial communities, and pathogenic bacteria distribution of three-stage sedimentation basins on four construction sites were investigated. Results indicated that truck-wash wastewater contained a high concentration of suspended solids (29–211 mg/L) and bacteria (4.2×103 to 2.7×104 colony forming units/mL). Proteobacteria (mean at 72.3%), Firmicutes (mean at 11.3%), and Bacteroidetes (mean at 10.6%) were the predominant bacterial phyla and Acinetobacter (mean at 18.4%), Chryseomicrobium (mean at 6.3%), and Paracoccus (mean at 6.1%) were the predominant bacterial genera. Truck-wash wastewater contained pathogenic bacteria, identified by the Illumina sequencing method. Acinetobacter, Shigella, or Escherichia (about 0.2%) and Legionella (about 0.2%) were the main pathogenic bacteria and Legionella should be a concern due to the wastewater reuse method. Traditional three-stage sedimentation basins should be simplified and further improved because of the lower suspended solids or pathogenic bacteria removal effect. The practical technology for suspended solids and pathogenic bacteria control in truck-wash wastewater should be further studied, and disinfection facilities should be applied to protect construction workers.
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