关键词： 微藻生物处理技术   农村污水   污水处理  

摘要： 为了全面评价ABGS在农村污水处理过程的作用,本研究设计并依次开展了曝气强度对比实验与光照强度对比实验,分析在农村污水处理系统中引入微藻及调整操作参数对提高污泥系统去污效率方面的作用。我们监测记录各反应器的出水水质特性、污泥浓度以及系统运行状态,结果 表明引入微藻对污水处理具有积极作用,光照对ABGS技术的应用影响更明显,为农村污水处理升级技术提供了指导与参考依据。

关键词： 污水处理   监测系统   物联网   皮革制造  

摘要： 基于皮革企业污水处理监测系统智能化的实际需求,本文引入物联网技术对皮革污水处理监测系统进行改造。在厘清皮革企业污水的排放来源和处理重点的基础上,梳理了现有污水处理工艺。结合物联网技术在污水处理体系中的应用优势,从系统的总体设计和功能设计两个角度,构建出可实现实时监控、远程维保的系统。

关键词： 污水处理   尾水处理   人工湿地  

摘要： 污水处理厂在净化污水的同时,会产生大量尾水,如何有效处理和利用这些尾水,是当前环保领域面临的重要问题。人工湿地作为一种新型的生态污水处理技术,其优点包括处理效果好、运行成本低、生态效益高等,被广泛应用于污水处理和尾水处理领域。曹妃甸新城大型污水处理厂在运行过程中,产生了大量尾水,影响了周围环境和人体健康。本文通过对污水处理厂尾水的分析,查阅《城镇污水处理厂污染物排放标准》(GB18918-2002),确定尾水的出水水质达到一级标准A标准的水体要求,同时计算人工湿地系统对COD、BOD5、NH3-N、TN、TP应达到的处理效率。根据人工湿地设计原则,计算参数和选择植物布局,设计出适合的人工湿地系统,以实现对尾水的有效处理和资源化利用,为我国环保事业做出贡献。同时,本研究还可以为其他地区污水处理厂尾水处理提供参考和借鉴。

关键词： 污水处理厂   排水泵   耗电成本   预算管理   绿色运营  

摘要： 本文聚焦于污水处理厂排水泵耗电成本预算管理的优化策略。文章强调优化该管理对推动成本控制精细化、提升资源配置效率、促进节能减排及增强财务管理水平的关键作用。剖析当前预算制定不合理等现状问题。提出建立科学预算体系、实施精细化控制措施等策略,以期实现耗电成本的有效控制,为污水处理厂的绿色运营提供有力支撑。

关键词： Polyhydroxybutyrate   Sequencing batch reactor   Bacillus sp. MB353   Chemical oxygen demand   Simulated wastewater   Wastewater treatment  

摘要： Polyhydroxybutyrate (PHB) are important biopolymers with the capacity to replace petrochemical based plastics, thus imparting a positive impact on the global ecosystems and human health. These biocompatible, biodegradable and ecofriendly biopolymers are of great significance. For the current study, sequencing batch reactor (SBR) of 2 L capacity was designed to produce Polyhydroxybutyrate with simultaneous wastewater treatment. This procedure was designed aerobically in submerged fermentation mode. Two SBR setups were established for PHB production and wastewater treatment. Setup-I, consisted of mixed microbial culture (MMC) as biocatalyst while in setup-II, MMC along with indigenous Bacillus sp. MB353 was used for biocatalysis. Both setups were tested for synthetic wastewater treatment having 500 mg/L of chemical oxygen demand at four different hydraulic retention times (HRTs) i.e., 6, 12, 24, 48 h. In setup-I, 6 h HRT produced maximum PHB of 3.6 g/L along with 28 mg/L effluent COD. In setup-II, maximum PHB of 6.02 g/L was detected at 12 h HRT with 38.4 mg/L effluent COD. These findings revealed that, both setups operated towards wastewater treatment with parallel polymer production. In setup-I, although COD removal efficiency was high but polymer production was low, while in setup-II with negligible decrease in COD removal efficiency almost double the quantity of the polymer was produced. Therefore, augmentation of MMC with Bacillus MB353 strain helped in increasing the levels of polymer production. Extracted polymer was characterized using HPLC and FTIR. These results revealed the effectiveness of SBR system to cater the management of waste in an eco-friendly manner.

关键词： Central composite rotational design   Soil biodegradation   Polyhydroxybutyrate   Polybutylene adipate terephthalate   Prediction model  

摘要： The massive use of plastics in various applications, particularly packaging, generates enormous amounts of plastic waste that can be found almost everywhere, including in soil. This represents a serious environmental pollution issue since the biodegradability in soils can take several years, depending on the microbial composition, the physical and chemical characteristics of plastics, and other relevant environmental factors such as the soil temperature, the soil moisture holding capacity (MHC), and the carbon:nitrogen (C/N) ratio. In this work, we evaluated the importance of these soil physical-chemical parameters on the biodegradation of a plastic film composed of PHB/PBAT. A design-of-experiments methodology, namely the Central Composite Rotational Design (CCRD) was used to determine the effects of these parameters in the biodegradation of the films in soil. The carbon dioxide evolution was followed for 6 months following the guidelines of the ASTM D5988 (2018). The results showed that the most important factor was the temperature. Higher temperatures (>= 37 degrees C) accelerated biodegradation while the adding of nitrogen (aqueous solution of ammonium chloride) had no impact on this process, probably because the C/N ratio pre-existing in the soil was suitable to guarantee microbial activity. Although a MHC between 80% and 100% is recommended by international standards, 60% MHC produced similar results. According to the methodology, the best combination possible includes a temperature of 37 degrees C and a MHC ranging from 60 to 100%.

关键词： CO   2   PHB   PHBV   Non-explosive conditions   Tween 80   Cupriavidus   sp. CY-1  

摘要： The production of polyhydroxyalkanoate (PHA) using CO2 through hydrogen-oxidizing bacteria under safe, non-explosive conditions is making impressive strides. The present study aimed to evaluate and demonstrate the growth and productivity of PHA by Cupriavidus sp. CY-1 under different non-explosive conditions, thereby providing critical data for practical applications. The experimental results highlighted the efficiency of the CY-1 strain in PHA biosynthesis, achieving a production rate of 11.87 g L−1, which corresponds to a 90.6% yield when fermenting a gaseous substrate composed of H2 (70%), O2 (20%), and CO2 (10%). The study also examined PHA production under different non-explosive conditions, including H2 concentrations of 3.8% (v/v) and O2 at 6.5% (v/v). Furthermore, the impact of CO (30% and higher) was assessed, revealing a detrimental effect on growth and PHA production. Notably, the addition of Tween 80 significantly enhanced PHA productivity. The effective utilization of CO2 has confirmed poly[(R)-3-hydroxybutyrate] (PHB) as a valuable derived form of PHA. By implementing a two-step treatment with valeric acid, we successfully produced P(3HB-co-3HV) (PHBV) at a concentration of 1.47 g L−1. This achievement highlights the potential to enhance PHA production through innovative strategies. Furthermore, the examination of phaC gene expression levels has facilitated accurate predictions of PHA productivity. The use of CO2 from trichloroethylene (TCE) biodegradation faced concentration-related challenges;however, the higher CO2 levels achieved from phenol biodegradation, at 1200 mg L−1, indicate substantial potential for efficient PHA production. © 2025 The Authors

关键词： Alkaliphiles   Lonar lake   Marinospirillum   PHB  

摘要： Two Gram-stain-negative bacterial strains (MEB164T and MEB148), were isolated from haloalkaline waters of Lonar, crater lake, India. The strains were helical, non-spore-forming and motile with polar tufts of flagella. Optimal growth occurred at 37 degrees C, at pH 10 and with 3% (w/v) NaCl. 16S rRNA gene sequences of strains (MEB164T and MEB148) demonstrated the highest similarity with Marinospirillum alkaliphilum DSM 21637T (97.8%) followed by Marinospirillum celere DSM 18438T (96%). The genome size of strain MEB164T was determined to be 2.8 Mb with genomic DNA G + C contents of 53.1 mol %. ANI and dDDH values between strain MEB164T and the most closely related type strain M. alkaliphilum DSM 21637T were (72.3% and 21.4 +/- 2.3%) while (AAI and POCP) values were (66.8 and 70.8%), respectively. Strain MEB164T exhibited potential for polyhydroxybutyrate (PHB) production, supported by key genes involved in PHB metabolism. Genome analysis further revealed presence of various pH tolerance genes, highlighting its adaptation to Lonar Lake. The predominant cellular fatty acids were summed feature 8 (C18:1 omega 7c/C18:1 omega 6c), C16:0 and summed feature 3 (C16:1 omega 7c/C16:1 omega 6c). The major respiratory quinone was ubiquinone-8. The prevalent polar lipids were diaminophosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, two unidentified amino phospholipids, three unidentified phospholipids and one unidentified lipid. Polyphasic analysis suggests that the two strains constitute a novel species within the genus Marinospirillum (family Oceanospirillaceae), proposed as Marinospirillum alkalitolerans sp. nov. The type strain is MEB164T (= JCM 35957T = MCC 5207T = NCIMB 15458T) and MEB148 (= JCM 35956 = MCC 5212 = NCIMB 15459) is an additional strain.

关键词： Sol-gel process  

摘要： To enhance the compatibility of polyhydroxybutyrate/polycaprolactone (PHB/PCL) binary blend system, a novel covalent compatibilizer, poly(methyl/amino)silsesquioxane (PMASQ) was synthesized via the base-catalyzed sol-gel method using Methyltrimethoxysilane (MTMS) and γ-Aminopropyl trimethoxysilane (APTMS). The films were prepared through the solution casting method with the blend of PHB/PCL (25:75, w/w) incorporating with various content of PMASQ (1wt%, 3wt%, 5wt%). As a result, ATR-FTIR analysis confirmed the successful synthesis of PMASQ and the subsequent grafting of PHB and PCL segments onto the PMASQ. The incorporation of 3wt% PMASQ significantly enhanced the tensile strength and elongation at break of the PHB/PCL films, demonstrating remarkable increases of 1.23 times and 6.17 times, respectively. Furthermore, the incorporation of PMASQ resulted in a reduction in crystallinity while enhancing thermal stability within the PHB/PCL blend system. An improvement in continuity was also observed in the PHB/PCL/PMASQ blends, characterized by a reduction in the size of the dispersed phase and an emergence of a homogeneous morphology. It could be concluded that PMASQ could effectively facilitate improvements in compatibility as well as physicochemical properties within this binary blend system. These findings provide theoretical support for the utilization of biodegradable biomaterials in industrial applications. © 2025, The Authors. All rights reserved.