Effective nutrient removal and metabolite accumulation by C. vulgaris cultivated using digested food waste and brine

As the sewerage system is incomplete, sewage in Korea lacks easily biodegradable organics for nutrient removal. In this country, about 11,400 tons of food waste of high organic materials is produced daily. Therefore, the potential of food waste as an external carbon source was examined in a pilot-scale BNR (biological nutrient removal) process for a half year. It was found that as the supply of the external carbon increased, the average removal efficiencies of T-N (total nitrogen) and T-P (total phosphorus) increased from 53% and 55% to 97% and 93%, respectively. VFAs (volatile fatty acids) concentration of the external carbon source strongly affected denitrification efficiency and EBPR (enhanced biological phosphorus removal) activity. Biological phosphorus removal was increased to 93% when T-N removal efficiency increased from 78% to 97%. In this study, several kinds of PHAs (poly-hydroxyalkanoates) in cells were observed. The observed PHAs was composed of 37% 3HB (poly-3- hydroxybutyrate), 47% 3HV (poly-3-hydroxyvalerate), 9% 3HH (poly-3-hydroxyhexanoate), 5% 3HO (poly-3-hydroxyoctanoate), and 2% 3HD (poly-3-hydroxydecanoate).

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Effect of condensate of food waste (CFW) on nutrient removal and behaviours of intercellular materials in a vertical submerged membrane bioreactor (VSMBR)

Bioresource Technology ◽

10.1016/j.biortech.2005.12.019 ◽

2007 ◽

Vol 98 (2) ◽

pp. 373-379 ◽

Cited By ~ 13

Author(s):

S.R. Chae ◽

H.S. Shin

Keyword(s):

Food Waste ◽

Nutrient Removal ◽

Membrane Bioreactor ◽

Submerged Membrane Bioreactor

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Nutrient removal using anaerobically fermented leachate of food waste in the BNR process

Water Science & Technology ◽

10.2166/wst.2003.0042 ◽

2003 ◽

Vol 47 (1) ◽

pp. 159-165 ◽

Cited By ~ 12

Author(s):

C.Y. Lee ◽

H.S. Shin ◽

S.R. Chae ◽

S.Y. Nam ◽

B.C. Paik

Keyword(s):

Food Waste ◽

Nutrient Removal ◽

Oxygen Demand ◽

Domestic Wastewater ◽

Molecular Size ◽

Synthetic Wastewater ◽

Biological Nutrient Removal ◽

Operation Conditions ◽

Removal Efficiencies ◽

Molecular Size Distribution

Nutrients removal efficiencies highly depend on the presence of biodegradable organic carbon in the biological nutrient removal (BNR) process but most domestic wastewater in Korea has shown a low C/N ratio and has a small amount of biodegradable COD (chemical oxygen demand). On the other hand, about 11,577 tons of food waste that contains a lot of organic material has been produced in Korea per day. The feasibility and applicability of anaerobically fermented leachate of food waste (AFLFW) as an external carbon source was examined in the laboratory-scale BNR process at different operation conditions with synthetic wastewater and domestic sewage. As the addition of AFLFW increased, the average removal efficiencies of SCOD, T-N, T-P changed from 96%, 60%, and 2% to 90%, 77%, and 67%, respectively. From anoxic nitrate utilization tests, it was observed that once the readily biodegradable COD (especially VFAs) was depleted, the denitrification rate reduced from 8.2 mg NO3-N/g VSS/hr to 0.7 mg NO3-N/g VSS/hr. From the molecular size distribution test, it was concluded that about 60% of soluble COD in effluent, which was considered to originate from AFLFW, had a large molecular size (> 30kDa) that was not used by microorganisms.

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Behaviors of Intercellular Materials and Nutrients in Biological Nutrient Removal Process Supplied with Domestic Wastewater and Food Waste

Water Environment Research ◽

10.2175/106143004x141834 ◽

2004 ◽

Vol 76 (3) ◽

pp. 272-279 ◽

Cited By ~ 3

Author(s):

So-Ryong Chae ◽

Hyeong-Seok Jeong ◽

Jae-Lim Lim ◽

Seok-Tae Kang ◽

Hang-Sik Shin ◽

...

Keyword(s):

Food Waste ◽

Nutrient Removal ◽

Domestic Wastewater ◽

Biological Nutrient Removal ◽

Removal Process

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Generation and analysis of biogas from kitchen waste at a small scale

WEENTECH Proceedings in Energy ◽

10.32438/wpe.0602134 ◽

2020 ◽

pp. 140-148

Author(s):

Md. Kumail Naqvi ◽

Mrinal Anthwal ◽

Ravindra Kumar

Keyword(s):

Food Waste ◽

Total Solid ◽

Small Scale ◽

Cow Dung ◽

Retention Period ◽

Household Level ◽

Replacement Model ◽

The Everyday ◽

Scale Experiment ◽

Small Period

Biogas is the product of anaerobic vitiation of biodegradable matter. This paper focuses on the need of alternative and green sources of energy at a household level and how biogas produced from the everyday organic waste has the potential and possibility to replace LPG cylinders at houses, shops etc. and empower us to step towards an eco-friendly future. The purpose this small-scale experiment has been to find the perfect input matter that is easy to acquire and which produces the maximum amount of gas from minimum input and within small period of waste retention. Four different types of input waste material containing different quantities of cow dung and kitchen food waste were studied through individual experimental setups. Waste was mixed and kept at room temperature and the pH and total solid concentration of the samples were recorded on regular intervals. From the experiment it was found that the optimum yield of biogas at a small scale, based on the parameters such as retention period, pH and total solid con-centration can be obtained by the use of food waste form households and kitchens. The exact composition has been discussed in this paper. The energy generated by the small-scale generator has also been compared to that of an LPG cylinder and an LPG replacement model has also been presented.

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