[논문]Waste treatment with the pilot scale ATAD and EGSB pig slurry management system followed by sequencing batch treatment

Lee, Young-Shin; Han, Gee-Bong

doi:10.4491/eer.2015.0060

Waste treatment with the pilot scale ATAD and EGSB pig slurry management system followed by sequencing batch treatment 원문보기

Environmental engineering research, v.20 no.3, 2015년, pp.277 - 284

Lee, Young-Shin (Department of Environment Engineering, Hanseo University) , Han, Gee-Bong (Department of Biosciences and Environmental Engineering, The Catholic University of Korea)

Abstract ▼ AI-Helper

Experiments for highly concentrated contaminants in pig waste slurry were carried out for the feasibility test of a pilot-scale innovative process scheme of engaging autothermal thermophilic aerobic digestion (ATAD) and expended granular sludge bed (EGSB) followed by sequencing batch reactor (SBR) system. Contaminants in pig waste slurry such as organic substance, total nitrogen (TN), ammonia nitrogen and total phosphorus (TP) contents were successfully reduced in the system. Total volatile solids (TVS) and chemical oxygen demands (COD) for organic matter in the feed were 32.92 g/L and 42.55 g/L respectively, and they were reduced by about 98.7% and 99.2%, respectively in the system. The overall removal efficiencies for TN and ammonium nitrogen were found to be 98.1 and 98.5%, respectively. The overall removal efficiency for total phosphorus was also found to be 92.5%. Faecal coliform density was reduced to <$1.2{\times}10^4CFU/g$ total solids. Biogas and $CH_4$ were produced in the range of 0.39-0.85 and $0.25-0.62m^3/kg$ [VS removed], respectively. The biogas produced in the system comprised of $295{\pm}26ppm$ (v/v) [$H_2S$].

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문제 정의

The effective treatments can decrease pathogens level, contaminants levels and manure volume, and odor potential. This study suggested the effective strategic process scheme for piggery waste slurry control for the management of pollutants at high concentration. The proposed system used in this study showed a way of controlled environmental management strategy and contaminants reduction.

제안 방법

The third stage unit system was the nutrient reduction system adopting a sequencing batch reactor (SBR). During the entire test, one cycle of SBR was comprised of 6 h operation, and two hours of aeration and one hour of non-aeration per one cycle were performed. Parameters for operation of all unit systems are listed in Table 2.
Pilot scale tests were performed to investigate effectiveness of reducing highly concentrated organics and nutrients from pig slurry waste. A schematic diagram of the experimental set-up was shown in Fig.
The ATAD and EGSB effluent samples were analyzed for total solids (TS), TVS, and chemical oxygen demand (COD). Sodium metaphosphate buffer (2 g/L; pH 6.
The raw pig waste slurry was comprised of waste mixtures of feces, urine and washing water, and its characteristics are shown in Table 1. The feed pig slurry composition was monitored for 14 months, and triplicate samples were analyzed in each time for twice per week.
The pilot scale experimental process consisted of three stages of successive unit systems in series by using the effluent of the previous step to the successive step as influent. The unit process of ATAD with coagulation was tested for the first stage system.
This study suggested the effective strategic process scheme for piggery waste slurry control for the management of pollutants at high concentration. The proposed system used in this study showed a way of controlled environmental management strategy and contaminants reduction.
This study has the following objectives to test the capability and efficiency of the innovative pilot-scale process scheme engaging an ATAD and EGSB unit process with SBR system for reduction of highly concentrated contaminants in pig slurry waste on the basis of results obtained. The specific aims of this study were to test: (1) system performance such as reduction of volatile solids (VS), supernatant chemical oxygen demand (COD), total nitrogen (TN), ammonium nitrogen (NH₄ ⁺ -N), and total phosphorus (TP); (2) fecal pathogens reduction; (3) biogas production during pig waste slurry treatment.
This study has the following objectives to test the capability and efficiency of the innovative pilot-scale process scheme engaging an ATAD and EGSB unit process with SBR system for reduction of highly concentrated contaminants in pig slurry waste on the basis of results obtained. The specific aims of this study were to test: (1) system performance such as reduction of volatile solids (VS), supernatant chemical oxygen demand (COD), total nitrogen (TN), ammonium nitrogen (NH₄ ⁺ -N), and total phosphorus (TP); (2) fecal pathogens reduction; (3) biogas production during pig waste slurry treatment.

대상 데이터

The pilot scale experimental system was supplied with pig waste slurry from a regional group of farmers keeping 6,000 hogs in Seosan-si Chungcheongnam-do, Korea. The raw pig waste slurry was comprised of waste mixtures of feces, urine and washing water, and its characteristics are shown in Table 1.

성능/효과

As a result, 98.7% total TVS in the feed was found to be reduced as total organic degradable solids in the pig waste slurry slowly decreased.
Overall removal efficiencies of 98.7% for TVS, 99.2% for COD, 98.1% for TN, 98.5% for NH₄⁺-N and 92.5% for TP were attained from feed concentration levels of 32.92 g/L [TVS], 42.55 g/L [COD], 5.08 g/L [TN], 3.68 g/L [NH₄⁺-N] and 1.12 g/L [TP] without supplementary dilution. Pathogen was also reduced subsequently by this system during the treatment.
62 m³/kg [TVS] destroyed from the EGSB reactor, respectively. The biogas generation from the third unit process system attained a maximum of 0.85 m³/kg [TVS] removed after 115 days of test, but the methane generation initialized at 38.5% of biogas content then attained a maximum of average 72.9% of biogas content after 115 days of test.
The overall removal efficiencies of 98.7 and 99.2% for TVS and COD, respectively, were predominantly attained by ATAD, coagulation and EGSB unit process systems.

후속연구

As a result, the proposed process scheme showed the possibility of using ATAD, EGSB, coagulation and SBR unit process system as an alternative technology for the control of piggery waste treatment. This system showed the successful development of an integrated process to environmental constraints.

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