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| Effects of zeolite-modified sediment on microbial biomass carbon and enzyme activity in soil |
| Received:September 07, 2016 |
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| KeyWord:sediment;modified zeolite;soil enzyme;microbial biomass carbon |
| Author Name | Affiliation | | WEN Jia | College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Key Laboratory of Environmental Biology and Pollution Control(Hunan University), Ministry of Education, Changsha 410082, China | | ZENG Guang-ming | College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Key Laboratory of Environmental Biology and Pollution Control(Hunan University), Ministry of Education, Changsha 410082, China | | AN He | College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Key Laboratory of Environmental Biology and Pollution Control(Hunan University), Ministry of Education, Changsha 410082, China | | JIA Min-juan | College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Key Laboratory of Environmental Biology and Pollution Control(Hunan University), Ministry of Education, Changsha 410082, China | | YI Yuan-jie | College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Key Laboratory of Environmental Biology and Pollution Control(Hunan University), Ministry of Education, Changsha 410082, China | | PENG Zhi-long | College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Key Laboratory of Environmental Biology and Pollution Control(Hunan University), Ministry of Education, Changsha 410082, China |
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| Abstract: |
| Heavy metals within the sediment will lead to soil contamination and subsequently cause harmful effects on human beings and organisms if the highly contaminated or not properly managed sediment is disposed on land. In this context, the use of the adsorbent zeolite might be a promising strategy to absorb and stabilize heavy metals in sediments, therefore reducing their mobility and increasing potential to make the sediment for beneficial reuse. In this study, we investigated the influence of two modified Dongting Lake sediments(modified by NaCl and chitosan zeolite) on microbial biomass carbon and two enzyme activities(i.e. urease and dehydrogenase) in soils. Results showed that upon the addition of two zeolite-modified sediments, water soluble metal content in the soil was reduced. Microbial biomass carbon was increased in a NaCl-modified zeolite treatment(zeolite:sediment mass ratio of 3/7) and three chitosan-modified zeolite treatments(zeolite:sediment mass ratio of 1/9, 3/7, and 6/4), and microbial biomass C/N ratio was approximately increased by 2.8-fold. In addition, chitosan-modified zeolite treatment had a greater impact on soil enzyme activities than NaCl-modified zeolite treatment. Urease activity and dehydrogenase activity in the highest dose of chitosan-modified zeolite treatment(zeolite:sediment mass ratio of 6/4) was increased by 1.1- and 1.6-fold, respectively. Therefore, the addition of chitosan-modified zeolite as amendment was an effective technique for sediment remediation, which allows for a possible end point for the dredged sediment. |
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