[Effect and Mechanism of Water-soluble Chitosan Promoting Phytoremediation of Cd and/or Pb-contaminated Soils by L].

A pot experiment was conducted to investigate the growth response, concentration, and transportation characteristics of Cd and Pb in L. in four typical Cd/Pb-contaminated soils from northern and southern China with the addition of different levels of water-soluble chitosan （WSC）. The effect of WSC on physicochemical properties, Cd and Pb forms, and functional groups in contaminated soils was determined to clarify the internal mechanism of WSC promoting Cd and Pb accumulation by .

[Species, Habitat Characteristics, and Screening Suggestions of Cadmium Hyperaccumulators in China].

Phytoremediation, as a green and effective in-situ remediation technology for heavy metal-contaminated soil, has attracted the attention of Chinese scholars and has resulted in a series of achievements over the past 20 years. In this study, the species characteristics, distribution of field discovery sites in various vegetation zones, habitat characteristics, habitat geological characteristics, and geochemistry of cadmium (Cd) of the Cd hyperaccumulators in China reported in the relevant literature from the past 20 years (from 2002 to 2021) were summarized by searching for related keywords. Finally, suggestions were proposed for the screening of new Cd hyperaccumulators.

[Distribution Characteristics and Risk Assessment of Heavy Metal Pollution in Farmland Soils and Crops in Luancheng, Shijiazhuang City].

In order to explore the distribution characteristics of heavy metal contamination of farmland soil surrounding Luancheng town, Shijiazhuang City, Henan province, the concentrations of As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn in the surface soil and crops were determined and assessed. The principal components were also analyzed for source apportionment. The heavy metal concentrations in crops were further detected, and the non-carcinogenic health risks in the study area were evaluated using the probabilistic risk assessment method, as to provide a theoretical basis for the treatment, prevention, and control of heavy metal pollution in farmland soil in Luancheng.

Effects of water-soluble chitosan on and soybean growth, as well as Cd uptake and phytoextraction efficiency in a co-planting cultivation system.

Intercropping a Cd-accumulator with economically valuable crops is common in slightly or moderately Cd-polluted farmland soils. A field experiment was conducted to evaluate the effects of water-soluble chitosan (WSC) on the growth and Cd uptake of the Cd-accumulator and soybean () during a co-cultivation in Cd-contaminated agricultural soil (WSC, 0 and 10 g·m). The results indicated that soybean yields were highest in response to the intercropping and WSC treatment.

[Main Control Factors of Cadmium Content in Rice in Carbonate Rock Region of Guangxi Based on the DGT Technique].

In order to explore the main controlling factors of Cd enrichment in rice under a geological high background in the Guangxi carbonate rock area, this study was based on rice grain-root soil samples from the carbonate rock areas in the southwest and north of Guangxi. Combined with diffusive gradients in thin films technology (DGT), the relationship between soil pH, organic matter, cation exchange capacity (CEC), DGT-Cd, and (rice-Cd)-BCF value in rice grains was analyzed and discussed. The main factors were determined by principal component analysis, and a quantitative model was established.

[Cd Accumulation Characteristics in Different Populations of Under Salt Stress].

A pot experiment was conducted to investigate the growth response and Cd accumulation characteristics among different populations of in Cd-contaminated cinnamon soil (2.22 mg·kg) with the addition of different concentrations of NaCl. Results showed that the biomasses and Cd concentrations of showed significant differences among different populations under Cd alone or Cd-salt combined stress.

[Spatial Distribution and Risk Assessment of Heavy Metal Pollution in Farmland Soils Surrounding a Typical Industrial Area of Henan Province].

In order to fully explore the spatial distribution of soil heavy metal contaminants in farmland soil surrounding a typical industrial area in Dakuai town, Xinxiang city, Henan Province, the concentrations of As, Cd, Cr, Cu, Ni, Pb, and Zn in the surface soil and within the soil profile were determined and assessed. The principal components were also analyzed for source apportionment to provide a theoretical basis for the control and prevention of heavy metal pollution. According to the results, the soils in the study area are severely contaminated by Cd and Cu and moderated contaminated by As due to the battery manufacture and Cu (e.

Microbial degradation in the co-composting of pig manure and biogas residue using a recyclable cement-based synthetic amendment.

This research investigated a synthetic amendment to improve composting and resource recycling of pig manure and biogas residue. We further examined whether adding a synthetic amendment impacts the microbial ecosystem in the composted materials. Three mixing ratios were used to investigate composting performance: no synthetic amendment (T0), 5% synthetic amendment (T1), and 10% synthetic amendment (T2) (T1 and T2 were measured as a wet weight ratio).

Microbial succession and degradation during kitchen waste biodrying, highlighting the thermophilic phase.

Biodrying in conjunction with compound stone amendment was used to treat kitchen waste, which improved biodrying. After 16 days, the pile moisture content decreased from 68.8% to 23.

[Effect of Nutrient Regulation and Control on Cd Accumulation Efficiency of Under Field Conditions].

A field experiment with an orthogonally designed experiment L9(3) was designed to investigate the effect of different N, P, and K levels on plant growth and Cd uptake by . The results showed that the biomass of significantly increased with the N application rate. The highest dry weight in the shoot occurred in the treatments with a high level of N (337.

[Tolerance Mechanism and Cadmium Enrichment Abilities in Two L. Cultivars].

A hydroponic experiment was conducted to explore the differences in growth status and Cd accumulation characteristics of two L. cultivars (QY-1 and SYH) under different concentrations of cadmium (Cd) stress (0, 2, and 5 mg·L). The Cd subcellular compartmentalization and antioxidant enzyme activities were determined to elucidate the intrinsic mechanism of the differences in the Cd accumulation capacity between the two cultivars of L.

[Safety Assessment of Rice Planting in Soil Cadmium Geological Anomaly Areas in Southwest Guangxi].

To evaluate the safety of rice planting in cadmium geological anomaly areas, 41 natural soil, 479 paddy soil, and 432 rice samples were collected in southwestern Guangxi. The contents of Cd, Cu, Ni, and Zn and soil physical and chemical properties were measured. The single factor pollution index method () was used to evaluate the degree of contamination of the sample, and correlation analysis were used to explore the main factors affecting the heavy metal content in rice.

Adding a recyclable amendment to facilitate sewage sludge biodrying and reduce costs.

Finding an economical amendment, available in a steady supply, is needed to support the biodrying industrialization. This research developed a recyclable biodrying amendment (RBA) to condition the biodrying of sewage sludge. The pilot-scale treatment (T), which included the addition of equivalent weights of RBA and sawdust as amendments, resulted in a higher pile temperature and longer thermophilic phase compared to the control (T), which used only sawdust as an amendment.

[Cd Content Characteristics and Ecological Risk Assessment of Paddy Soil in High Cadmium Anomaly Area of Guangxi].

To investigate the levels of heavy metal Cd in paddy soils in high cadmium anomaly areas in Guangxi, and to assess their potential ecological risks to the environment. Through preliminary screening and detailed investigation, 912 pieces of soil samples from high-cadmium abnormal area were collected in multiple batches to determine the soil Cd content. The single-factor pollution index method and potential risk index method were used to control the Cd pollution degree of paddy soil.

[Interaction of Cd and Zn Affecting the Root Morphology and Accumulation of Heavy Metals in ].

A hydroponic experiment was conducted to study the interaction of Cd and Zn affecting the root morphology and accumulation of Cd and Zn in . The results show that exhibits a high tolerance to single stress of Cd and Zn and the concentrations of Cd and Zn in the leaf, stem, and root of increase as the stress levels increase. A strong phytoextraction capacity in was also observed for the Cd concentration in the aboveground part reaching 133.

[Sources and pollution characteristics of antibiotic resistance genes and conditional pathogenic bacteria in concentrated swine feeding operation.].

Air in concentrated animal feeding operations contains antibiotic resistance genes and airborne pathogens, with potential threat to human and animal health. In this study, air was sampled in the living area, outside, and inside of a fattening pig house in a pig farm for 24 and 48 hours. Feedstuffs, drinking water additives, and feces in the pig house were collected.

[Spatial Distribution Study and Pollution Assessment of Pb in Soils in the Xijiang River Drainage of Guangxi].

To obtain data for the accumulation of Pb and its risk in soils in the Xijiang River drainage of Guangxi, 2594 samples were collected from nonferrous metal mining soils, farmland soils (paddy soils and dryland soils), and the background soils in the drainage area. Geostatistical analysis combined with GIS was used to study the soil spatial distribution characteristics and pollution distribution of the soil Pb content. The results showed that the Pb background value of the soil was 51.

Decomposition of lignocellulose and readily degradable carbohydrates during sewage sludge biodrying, insights of the potential role of microorganisms from a metagenomic analysis.

Sewage sludge biodrying is a waste treatment method that uses bio-heat generated from organic degradation to remove moisture from sewage sludge. Lignocellulose and carbohydrate decomposition is important when assessing biodrying performance. This study investigated lignocellulose and carbohydrate decomposition, and the potential microbial functions during biodrying.

New insights into biodrying mechanism associated with tryptophan and tyrosine degradations during sewage sludge biodrying.

Sewage sludge biodrying is a treatment that uses bio-heat generated from organic degradation to remove water from sewage sludge. Dewatering is still limited during biodrying, due to the presence of extracellular polymeric substances (EPS) in sludge. To study the biodrying mechanism associated with EPS compositions tryptophan and tyrosine degradations, this study investigated the microbial function in sludge biodrying material.

Comparison among soil additives for enhancing Pteris vittata L.: Phytoremediation of As-contaminated soil.

Pot experiments were conducted to assess the effects of monoammonium phosphate (NHHPO) and citric acid (CA) on the arsenic uptake of Chinese brake fern (Pteris vittata L. in two typical arsenic-contaminated soils i.e.

Structure modification and extracellular polymeric substances conversion during sewage sludge biodrying process.

Biodrying, an economical and energy-saving biomass waste treatment, removes water from waste using the biological heat generated by organic matter degradation. Technical limitations associated with dewatering complicate the biodrying of sewage sludge. This study investigated the sludge alteration associated with its water removal, focusing on sludge form, extracellular polymeric substances, and free water release.

Odor composition analysis and odor indicator selection during sewage sludge composting.

Unlabelled: On the basis of total temperature increase, normal dehydration, and maturity, the odor compositions of surface and internal piles in a well-run sewage sludge compost plant were analyzed using gas chromatography-mass spectrometry with a liquid nitrogen cooling system and a portable odor detector. Approximately 80 types of substances were detected, including 2 volatile inorganic compounds, 4 sulfur organic compounds, 16 benzenes, 27 alkanes, 15 alkenes, and 19 halogenated compounds. Most pollutants were mainly produced in the mesophilic and pre-thermophilic periods.