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New Technologies Used in Wastewater Treatment
Published in Pankaj Chowdhary, Sujata Mani, New Technologies for Reclamation of Industrial Wastewater, 2021
Pyridines and quinolines are N-heterocyclic compounds that are used as solvents for paints, dyes, and wood treating chemicals and are found as raw materials in pharmaceutical and industrial wastes and, subsequently, in industrial wastewaters. Quinolines—carcinogenic compounds—are recalcitrant compounds that are commonly found in coal tar and petroleum products. They persist in the environment because of their low biodegradability. In a study, enhanced biodegradation of quinoline present in petroleum refinery wastewater was reported by using Bacillus sp., which was isolated from the soil through the batch reactor (Tuo et al., 2012). In another study, pyridine and quinoline were successfully biodegraded by Paracoccus sp. and Pseudomonas sp. bioaugmented with wastewater medium. In this study, though, the level of pyridine and quinoline was reduced, but the nitrogen content was reported to remain high (Bai et al., 2009). To overcome this challenge, another study was performed using the same microorganisms in an SBR reactor with modified zeolite, which contributed to the removal of nitrogen through adsorption and results showed reduced pyridine, quinoline, and nitrogen content in the medium (Bai et al., 2010). The increased removal of pyridine was also reported through the bioaugmentation of industrial wastewater using SBR with Rhizobium sp. and in a membrane batch reactor (MBR) with Paracoccus denitrificans (Liu et al., 2015; Wen et al., 2013). To date, no further study has been reported in the removal of pyridine and quinoline.
Organic Chemicals
Published in William J. Rea, Kalpana D. Patel, Reversibility of Chronic Disease and Hypersensitivity, Volume 4, 2017
William J. Rea, Kalpana D. Patel
Quinolines and azaarenes are aromatic homocyclic compounds that represent many important structures upon which drugs are based. Quinoline itself is carcinogenic, leading to hepatocellular cancer and hemangioendotheliomas in rats and mice. Among the chemicals obtained from the action of frying or boiling meats under realistic home cooking conditions were several compounds based on an imidazoquinoline or quinzoline ring system. These chemicals were among the most mutagenic compounds found. They may be the agents associated with cancer of the colon, and certainly they exacerbate chemical sensitivity. When 4-nitroquinolone-N-oxide is combined with a carcinogenic growth promoter, croton oil, and painted on the skin of rats, it causes papillomas and carcinomas. Some of the other quinolines include benzo(g)quinoline, benzo(f)quinoline, 2-amino-3-methylimidazo(4,5-f)quinoline, 4-nitro-2-formamido-4-(5-nitro-2-furyl)thiazole.
Advancement of corrosion inhibitor system through N-heterocyclic compounds: a review
Published in Corrosion Engineering, Science and Technology, 2023
Rashika Batra, Ashish Kumar Singh, Manjeet Singh, Sanjeeve Thakur, Balaram Pani, Savas Kaya
Quinoline is a heterocyclic compound of nitrogen that is mainly composed of two cyclic rings having the molecular formula of C9H7N (Figure 6). Here pyridine and benzene molecules are being merged and a good range of solubility exhibited by quinoline in hot water as well as numerous organic solvents led to its use in diverse applications [59,82]. Though in its highest purity form this heterocyclic compound is not seen to be highly utilised derivatives associated with it are used in various applications like biological and other industrial ones [83]. Just like other heterocyclic compounds, quinolines are also counted as a water-contaminating agent. Quinoline is rich in electrons due to the availability of 10 pi-electrons and non-bonding electrons on nitrogen. This is considered the most probable reason that it can better interact with the metal surface. Literature has come across various pieces of evidence where the application of quinoline and its derivatives as an anti-corrosive agent has been used [84,85]. Also, due to the high solubility of quinoline and associated derivatives in an aqueous medium they can also be best utilised to tackle the aqueous phase corrosion [86] (Figure 7).
Restricted substances for textiles
Published in Textile Progress, 2022
Arun Kumar Patra, Siva Rama Kumar Pariti
Quinoline is a heterocyclic aromatic compound with the chemical formula C9H7N and structure as shown in Figure 21. It is colourless hygroscopic liquid with strong odour. Quinoline finds use in some very specific dyes like CI Disperse Yellow 54, CI Solvent Yellow 33 (Hunger, p 110). A typical fluorescent disperse dye with a benzamido1,2 quinoline structure and Yellow WS, an acid dye both have quinoline present in their structure (Figure 22). Considered to be an important structural component of synthetic colourants it gives yellow or greenish yellow colour (Lam et al., 2012). Quinoline is also found in dispersing agents used in disperse and vat dyes. A commonly-used class of dispersing agents is the naphthalene formaldehyde condensates, which are manufactured from naphthalene a product isolated from coal tar. Quinoline is a minor by-product in the processing of naphthalene and it is likely that low-grade naphthalene is contaminated with small amounts of quinoline which carries through into the manufacturing of the naphthalene formaldehyde condensate dispersing agents. Quinoline also has biocidal properties and so may also be used as a fungicide (https://afirm-group.com/afirm-rsl/).
Bioaugmentation of quinoline-degrading bacteria for coking wastewater treatment: performance and microbial community analysis
Published in Journal of Environmental Science and Health, Part A, 2022
Kexin Liu, Yuxiu Zhang, Weichao Xu
Coking wastewater (CWW) is a typical toxic industrial wastewater containing ammonia-nitrogen, phenolic compounds, polycyclic aromatic hydrocarbons (PAHs), nitrogen heterocyclic organic compounds (NHCs) and various other refractory pollutants.[1,2] Quinoline and its related derivatives are usually the most common NHCs in CWW. In addition, in previous studies, quinoline has been reported to possessed a severe toxic effects on humans, the environment and aquatic organisms.[3] The excess emission of quinolines could pose a great threat on environment quality and human health due to its toxic, mutagenic, and highly carcinogenic properties.[4,5] Therefore, how to effectively eliminate quinolines from CWW has emerged as an immensely challenging and arduous problem.