In this study, with rape straw as carbon source, anaerobic batch experiments were executed to investigate the effect of Zn (II) on the activity of sulphate reducing bacteria (SRB) in the microbial treatment of simulative acid mine drainage (AMD). The results showed that during the 60 experimental days, when initial Zn2+ concentrations were in the range of 73.7 to 196.8 mg x L(-1), SRB had high culturalbility. At the end of these experiments, pH values rose from initial 5.0 to neutral, about 96% of sulphate was reduced and the concentrations of Zn2+ reduced to 0.05 mg x L(-1). The results of Tessier sequential extraction, field emission scanning electron microscope (FE-SEM) and X-ray diffraction(XRD) showed that Zn was found to be fixed through forming organic and sulphide (mainly sphalerite) compounds. For the experiment with high Zn2+ concentration (262.97 mg x L(-1)), at the end of experiments, pH values dropped from initial 5.0 to 4.0, only 27% of sulphate was only reduced and the concentrations of Zn2+ kept in high range (25 mg x L(-1)), the activity of SRB significantly inhibited. This study indicated that: (1) Rape straw can be used as slow-release carbon source for long-term anaerobic AMD treatment; (2) Rape straw can decrease the toxicity of Zn2+ to SRB through adsorption; (3) In anaerobic AMD treatment system, Zn can be fixed by sulphide minerals with mediation of SRB.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Regulation of straw-derived DOM and clay mineral complexation on mercury accumulation in vegetables.
Environ Res
November 2024
Key Laboratory of Karst Georesources and Environment (Guizhou University), Ministry of Education, Guiyang, 550025, China; College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China.
Article Synopsis
- The study investigates how dissolved organic matter (DOM) from straw affects mercury (Hg) dynamics in soil and plants, particularly focusing on its impact on methylmercury (MeHg) accumulation.
- Results show that straw-derived DOM increases MeHg levels in soil and water spinach, but humified DOM can reduce these levels significantly.
- Additionally, interactions between humified DOM and clay minerals (like montmorillonite) play a crucial role in either promoting or inhibiting Hg methylation and accumulation in plants.
Analysis of the phytoremediation potential, rice safety, and economic benefits of light to moderate Cd-contaminated farmland in oilseed rape-rice rotation with straw removal: A three-year field trial.
Environ Res
December 2024
College of Environment and Ecology, Hunan Agricultural University, Changsha, Hunan, 410128, PR China; Key Laboratory for Rural Ecosystem Health in Dongting Lake Area of Hunan Province, Changsha, 410128, PR China.
Under the dual pressures of food security and soil cadmium (Cd) pollution in China, the use of an oilseed rape-rice rotation system and phytoremediation has been proposed as an effective measure to extract heavy metals from soil, achieve safe rice production, and alleviate soil heavy metal stress. A three-year field rotation experiment by straw removal was conducted in light to moderate Cd-contaminated soil in Hunan, China. The experiment involved rotating two oilseed rape varieties, LSYH and ZYZ, with two rice varieties, the low-accumulation variety XWX and the high-accumulation variety TYHZ.
View Article and Find Full Text PDFImpact of Additives and Packing Density on Fermentation Weight Loss, Microbial Diversity, and Fermentation Quality of Rape Straw Silage.
Microorganisms
September 2024
Inner Mongolia Engineering Research Center of Development and Utilization of Microbial Resources in Silage, Inner Mongolia Academy of Agriculture and Animal Husbandry Science, Hohhot 010031, China.
To investigate the effects of the combined addition of and sucrose on the fermentation weight loss (FWL), fermentation quality, and microbial community structure of ensiled rape straw under varying packing density conditions. After harvesting, the rapeseed straw was collected, cut into 1-2 cm pieces, and sprayed with sterile water to adjust the moisture content to 60%. The straw was then divided into two groups: one treated with additives (1 × 10 CFU/g fresh material of and 10 kg/t fresh material of sucrose), and the other sprayed with an equivalent amount of sterile water as the control (CK).
View Article and Find Full Text PDFEffects of straw structure and component on feeding efficiency of yellow mealworm for insect protein production.
Bioresour Technol
December 2024
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Frontiers Science Center for Animal Breeding and Sustainable Production, Wuhan, China. Electronic address:
Elucidating the influence of straw structure and component on the feeding efficacy of yellow mealworm is pivotal for improving insect protein production from straw. This research utilized four distinct types of straws-water hyacinth straw (WHS), corn straw (CS), rape straw (RAS), and rice straw (RIS)-as the sole substrate for larvae. Results indicated that the straw utilization rate and fresh larval weight gain rate followed the order of WHS > CS > RAS > RIS.
View Article and Find Full Text PDFStudy on the adsorption of phosphate by composite biochar of phosphogypsum and rape straw.
Environ Geochem Health
October 2024
School of Resource and Safety Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
Wastewater containing phosphorus is often added by industrial activities, which is bad for the environment. In this study, composite biochar (PG-RS700) was prepared from phosphogypsum (PG) and rape straw (RS) for the treatment of phosphate in wastewater. SEM, FTIR, XRD and XPS characterization results showed that PG and RS were successfully combined.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!