Treatment of artificial secondary effluent for effective nitrogen removal using a combination of corncob carbon source and bamboo charcoal filter

Abstract

Nitrogen from secondary effluents has endangered the aquatic environment and human health. A new experimental setup combining a corncob carbon source and bamboo charcoal filter (BCF) was used to effectively purify artificial sewage treatment plant tail water that had high nitrate and nitrogen content, and a low carbon to nitrogen (C/N) ratio. The nitrogen concentration in the reactor's effluent was below the limit of 15 mg/L when the influent COD concentration was 20 mg/L-60 mg/L, the influent NO 3-N concentration was 15 mg/L-30 mg/L, and the hydraulic retention time (HRT) was 1 h-4 h. The reactor's maximum volumetric load of total nitrogen was 0.585 kg/(m 3 •d). The COD and NO 3-N balances of the reactor indicated that 4.77 g corncob was required to remove 1 g NO 3-N and 2 g corncob was required to release 1g COD.

Evaluación de un filtro biológico como unidad de post-tratamiento de aguas residuales utilizando conchas marinas como material de soporte

“…El sistema en estudio se mantuvo en el rango mesofílico, la temperatura se encontró entre 26,6 y 31,5°C, la cual está dentro del rango óptimo (25 y 35°C) que se establece para esta condición [21,22]. El comportamiento de la DQO T , DQO S y DBO [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] , en el afluente y efluente del FB, para los TRH estudiados se puede evidenciar en las Figuras 5, 6 y 7. Respecto a la DQO, en el TRH de 12,85h se encontraron remociones para la DQO T y DQO S de 19 y 41%, respectivamente.…”

“…La principal finalidad del MS es permitir la acumulación de grandes cantidades de biomasa, con un consecuente aumento de tiempos de retención celular, actuar como una barrera física evitando que los sólidos sean arrastrados en el efluente y mejorar el contacto entre los constituyentes del afluente y los sólidos biológicos contenidos en el FB [9]. El MS más común es piedra, pero se pueden utilizar plástico, elementos cerámicos, cilindros de plástico tubulares, elementos de madera como trozos de troncos, cilindros y entre los no comunes, el bambú [10]. Recientemente se emplean como MS restos de acero [11], telares de poliéster no tejido [12], conchas de coco [13] y conchas de ostras [14], reportando que las conchas marinas son MS rentables y alcanzan reducciones satisfactorias de materia orgánica en el tratamiento de AR.…”

“…Despite receiving pretreatment, the number of total and fecal coliforms FB influent were high, showing orders up to 10 7 MPN/100ml, the greater efficiencies in the removal of total and fecal coliforms were 97,24 and 94.63%, respectively, recorded in the TRH 12.85h. It is evident that the shells (Arca zebra) are sustainable SM and with these as MS achieve satisfactory reductions of organic matter in the treatment of ARM.…”

Enhanced Denitrification of Integrated Sewage Treatment System by Supplementing Denitrifying Carbon Source

“…The materials have similar carbon release properties but released different amounts of carbon sources. In the initial 6 h, the cumulative amount of the carbon sources increased quickly, and then, the release velocities stabilized at very low levels in 6–144 h. This phenomenon occurred because the surface of agricultural waste contains substantial soluble organic carbon [ 14 ] and organic particles that easily fall off [ 15 ], and these substances easily dissolve in water and release organic carbon. As the reaction proceeds, the cellulose, which is difficult to degrade in agricultural waste, begins to decompose, leading to slow carbon release until equilibrium.…”

Nitrogen Advanced Treatment of Urban Sewage by Denitrification Deep-Bed Filter: Removal Performance and Metabolic Pathway

“…Many materials could be utilized as carbon sources, such as waste paper (Bao et al, 2016;Haske-Cornelius et al, 2021), biodegradable polymer (Wang et al, 2021), and wheat straw (Khokhar et al, 2014;Liu et al, 2021). Readily biodegradable organic matters are the optimal electron donors compared with refractory organic and other electron donors (Cao et al, 2016;Luo et al, 2020). Meanwhile, an insufficient dose would result in a low denitrification rate, while COD concentration would not meet the discharge standard when excessive dosage carbon sources are added (Ge et al, 2012).…”