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Effect of Acid Whey Addition for Sewage Sludge Co-Digestion on the Nitrogen and Phosphorus Release

Bis Marta

Journal of Ecological Engineering

2020

Vol. 21, nr 6

13--21

This study examined the influence of acid cheese whey (ACW) addition on the nitrogen and phosphorus release in the co-digestion with sewage sludge (SS). The laboratory installation consisted of two semi-flow anaerobic digesters operating under mesophilic conditions. The concentrations of total nitrogen (TN), total phosphorus (TP), NH4+-N and PO43--P in the feedstock and the digestate were determined together with the appropriate release factors. The results indicate that the co-digestion of SS with ACW did not cause a significant increase in the concentration of biogenic elements both in the reactor feedstock and the digestate. Lower concentration of total nitrogen and total phosphorus was achieved in the digestate, both in whey and reference runs, probably due to partial retention in the digesters due to the precipitation processes.

Treatment of dairy waste by anaerobic co-digestion with sewage sludge

Pilarska A. A., Pilarski K., Witaszek K., Waliszewska H., Zborowska M., Waliszewska B., Kolasiński M., Szwarc-Rzepka K.

Ecological Chemistry and Engineering. S

2016

Vol. 23, nr 1

99--115

The results of anaerobic digestion (AD) of buttermilk (BM) and cheese whey (CW) with a digested sewage sludge as inoculum is described. The substrate/inoculum mixtures were prepared using 10% buttermilk and 15% cheese whey. The essential parameters of the materials were described, including: total solids (TS), volatile solids (VS), pH, conductivity, C/N ratio (the quantitative ratio of organic carbon (C) to nitrogen (N)), alkalinity, chemical oxygen demand (COD). The potential directions of biodegradation of the organic waste types, as used in this study, are also presented. Appropriate chemical reactions illustrate the substrates and products in each phase of anaerobic decomposition of the compounds that are present in buttermilk and cheese whey: lactic acid, lactose, fat, and casein. Moreover, the biogas and biomethane production rates are compared for the substrates used in the experiment. The results have shown that buttermilk in AD generates more biogas (743 m3/Mg VS), including methane (527 m3/Mg VS), when compared with cheese whey (600 m3/Mg VS, 338 m3/Mg VS for biogas and methane, respectively).

Biodegradacja serwatki z wykorzystaniem szczepu B. licheniformis

Lech M., Trusek-Hołownia A.

Inżynieria i Aparatura Chemiczna

2013

Nr 5

443--444

Celem badań jest określenie kinetyki wzrostu szczepu B. licheniformis na podłożu składającym się z przemysłowej serwatki, oraz szybkości biodegra dowania przez ten szczep laktozy i białek serwatkowych w niej zawartych. Wykazano, iż szybkość wzrostu dla stężeń poniżej 2 [kg m"3] jest reakcją pierwszego rzędu ze względu na laktozę. Dla stężeń wyższych obserwuje się inhibicję substratową. Obserwuje się również spadek stężenia białka, jednak szybkość biodegradowania jest o rząd wielkości niższa niż w przypadku laktozy.

Results of whey biodegradation using bacteria strain of B. licheniformis are presented in the paper. The growth kinetics of this strain was developed. The rate of lactose transformation to low lactose concentration is dependent on its content and it could be described as a first-order reaction. During biodegradation a decrease in proteins concentration was observed. In this case, the rate of biodegradation was much slower than that for lactose.