Occurrence of veterinary antibiotics in struvite recovery from swine wastewater by using a fluidized bed

Antibiotics in wastewater pose pharmacological threats to phosphorous recovery. Recovered struvite particles possessed significantly antibiotic residues. Smaller granules contained much more antibiotics than the larger ones. Organic matters and struvite granulation process exerted significant impacts. Recovering phosphorus from livestock wastewater has gained extensive attention. The residue of veterinary antibiotics in the wastewater may be present in the recovered products, thereby posing pharmacological threats to the agricultural planting and human health. This study investigated antibiotic occurrence in the struvite particles recovered from swine wastewater by using a fluidized bed. Results revealed that tetracyclines possessed significant residues in the struvite granules, with the values ranging from 195.2 mg·kg⁻¹ to 1995.0 mg·kg⁻¹. As for fluoroquinolones, their concentrations varied from 0.4 mg·kg⁻¹ to 1104.0 mg·kg⁻¹. Struvite particles were of various sizes and shapes and displayed different antibiotic adsorption capacities. The data also showed that the smaller granules contained much more antibiotics than the larger ones, indicating that the fluidized granulation process of struvite crystals plays an important role on the accumulation of antibiotics. For tetracyclines, organic matters and struvite adsorption exerted significant impacts on tetracyclines migration. The outcomes underscore the need to consider the residues of antibiotics in resource recovery from wastewater because they exert pharmacological impacts on the utilization of recovered products.     

The association between heavy metal soil pollution and stomach cancer: a case study in Hangzhou City,China

Stomach cancer (SC) is a severe health burden, with nearly half of the world’s cases found in China. Noticeably, the emissions of heavy metals into the environment have increased alongside rapid urbanization and industrialization in China. However, as regards carcinogenic associations, the relationship between heavy metals and SC is yet unclear. Based on 9378 newly diagnosed SC cases in Hangzhou City from 2009 to 2012, this work is concerned with the quantitative characterization of the spatial distribution pattern of SC incidence and its geographical association with soil heavy metals by means of a novel geographical model. The results show that (a) Cd is one of the severe soil pollutants in Hangzhou; (b) higher SC incidence clusters are in central Hangzhou, whereas lower clusters are found in the northeast and southwest with a male to female incidence ratio about 2.2:1; (c) although when considered separately, the heavy metals in this work do not have a considerable impact on the distribution of SC incidence in Hangzhou City, nevertheless, the joint effects of multiple heavy metals have significant impacts on SC risk. The present work calls for a rigorous quantitative assessment of the integrated heavy metal soil pollution and its effects on SC incidence.     

亚硝基胍对泥鳅红细胞微核及核异常的诱发

研究了诱变剂对泥鳅红细胞微核和核异常的诱发作用,以寻求较为简便的检测水体中污染物对遗传物质的损害程度及毒理效应的方法。试验以亚硝基胍（MNNG）作为诱变剂,研究其不同浓度和染毒时间对泥鳅红细胞微核形成和核异常的影响。试验结果表明,在一定浓度范围内,微核细胞率与亚硝基胍浓度呈正相关;但当浓度过高时,微核细胞率反而降低。此外,研究还发现,随着亚硝基胍浓度的升高,微核细胞率出现高峰的时间也相应提前。从试验结果来看,微核测定法确是遗传毒理学试验中一个较为理想的监测手段。     

Preparation and Adsorption Performance of Nano-hydroxyapatite-Enhanced Acrylamide Hydrogel Adsorbent

Journal of Polymers and the Environment - In this study, a hydrogel adsorbent was successfully synthesized using hydroxyapatite/acrylamide/β-cyclodextrin to adsorb heavy metal ions and dyes in...