Isolation, genetic identification and degradation characteristics of COD-degrading bacterial strain in slaughter wastewater

Abstract

Contamination of water by meat production is an important and extensive environmental problem and even threat to human health. Biodegradation is a major mechanism which removes the pollutants from the environment. Therefore, the present study aimed to isolate and characterize a COD degrading bacteria which can effectively degrade slaughter wastewater. Six COD degrading bacteria were isolated from slaughtering waste water and sludge in Hunan a meat product Co., Ltd. And the COD degradation rate of each strain was determined by potassium permanganate method. Through observing morphologically and analyzing sequence to 16S rDNA, the highest COD degradation strain was Bacillus velezensis by preliminarily identified and classified, reaching 11.80%. The suitable conditions of the growth of Bacillus velezensis strain were 37 °C, pH 7.0, the peptone concentration 1.5%, and the yeast extract concentration 0.8%.

A study on soybean responses to drought stress and rehydration

“…Before sampling, the potted plants were removed from the rain shelter and placed in the sunlight for 1–2 h. Three plants with uniform growth characteristics were selected from each treatment, and the top second and third leaves were harvested, mixed, and divided into 5 samples. Each treatment had 3 replicates (Li et al, 2018). The samples were divided into 2 portions; one portion was kept on ice for immediate measurement and the other portion was flash-frozen in liquid nitrogen and stored in a −80 °C freezer.…”

Method for accurate diagnose of lupus erythematosus skin lesions based on microbial rDNA sequencing

“…Along with searching and referring to GEO PubMed databases of NCBI, EXALT database and 2019 After-healing Long-term SLE Tracking Database in Jiangsu Province, we gathered primary data by independent research. Based on the selecting criteria mentioned above, 20 patients from the database of Jiangsu Province were selected as experimental group, including 18 females and 2 males ( Li et al, 2018 ). The average age of the patients was 31.52 ± 8.76.…”

Continuous Biodegradation of Sugar Beet Distillery Stillage in an Aerobic Stirred-Tank Reactor: The Effect of Hydraulic Retention Time

“…Moreover, Bacillus bacteria sp. were also characterized by high efficiency of degradation in other by-product of the agri-food industry, such as dairy [20,21] or slaughter processing wastewater [22].…”