Next Article in Journal
Spatial Distribution Variation and Probabilistic Risk Assessment of Exposure to Fluoride in Ground Water Supplies: A Case Study in an Endemic Fluorosis Region of Northwest Iran
Next Article in Special Issue
Determination of Metal Content of Waste Mobile Phones and Estimation of Their Recovery Potential in Turkey
Previous Article in Journal
Urinary Pesticide Levels in Children and Adolescents Residing in Two Agricultural Communities in Mexico
Open AccessArticle

Soil Pollution Characteristics and Microbial Responses in a Vertical Profile with Long-Term Tannery Sludge Contamination in Hebei, China

1
Institute of Hydrogeology & Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
2
Hebei and China Geological Survey Key Laboratory of Groundwater Remediation, Institute of Hydrogeology & Environmental Geology, Shijiazhuang 050061, China
3
School of Earth Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China
4
Chinese Academy for Environmental Planning, Beijing 100012, China
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(4), 563; https://doi.org/10.3390/ijerph16040563
Received: 17 January 2019 / Revised: 9 February 2019 / Accepted: 11 February 2019 / Published: 15 February 2019
(This article belongs to the Special Issue Hazardous Waste and Human Health)
An investigation was made into the effects of tannery sludge on soil chemical properties and microbial communities in a typical soil profile with long-term tannery sludge contamination, North China. The results showed that trivalent chromium (Cr(III)), ammonium, organic nitrogen, salinity and sulfide were the predominant contaminants in tannery sludge. Although the tannery sludge contained high chromium (Cr, 3,0970 mg/kg), the proportion of mobile Cr forms (exchangeable plus carbonate-bound fraction) only accounted for 1.32%. The X-ray diffraction and X-ray photoelectron spectroscopy results further demonstrated that the Cr existed in a stable state of oxides and iron oxides. The alkaline loam soil had a significant retardation effect on the migration of salinity, ammonium, Cr(III) and sulfide, and the accumulation of these contaminants occurred in soils (0–40 cm). A good correlation (R2 = 0.959) was observed between total organic carbon (TOC) and Cr(III) in the soil profile, indicating that the dissolved organic matter from sludge leachate promoted the vertical mobility of Cr(III) via forming Cr(III)-organic complexes. The halotolerant bacteria (Halomonas and Tepidimicrobium) and organic degrading bacteria (Flavobacteriaceae, Tepidimicrobium and Balneola) became the dominant microflora in the soil profile. High contents of salinity, Cr and nitrogen were the main environmental factors affecting the abundance of indigenous microorganisms in soils. View Full-Text
Keywords: tannery sludge; soil profile; chromium; vertical migration; microbial community tannery sludge; soil profile; chromium; vertical migration; microbial community
Show Figures

Graphical abstract

MDPI and ACS Style

Kong, X.; Li, C.; Wang, P.; Huang, G.; Li, Z.; Han, Z. Soil Pollution Characteristics and Microbial Responses in a Vertical Profile with Long-Term Tannery Sludge Contamination in Hebei, China. Int. J. Environ. Res. Public Health 2019, 16, 563.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop