• KSCE Journal of Civil and Environmental Engineering Research
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• v.13 no.4
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• pp.269-275
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• 1993

The performance of Upflow Anaerobic Sludge Blanket(UASB) reactor for treatment of corn starch wastewater was investigated using continuous and batch experiment. Results showed that the corn starch wastewater had different characteristics in terms of biodegradability and methane potential, depending on the manufacturing precess. COD removal efficiencies were maintained over 70% up to the loading rate of 3.2 kg $COD/m^3{\cdot}day$ and the maximum gas production rate was about 55 l/day, equivalent to 3.5 l/day per liter of reactor volume, at the loading rate of 8.4 kg $COD/m^3{\cdot}day$. In the anaerobic serum bottle test(SBT) carried out along with continuous operation, the sludge activity was found to increase from 0.03 to 0.53 g $COD-CH_4/g\;VSS{\cdot}day$ as granular sludges were developed in 130 days operation. SBT gave valuable informations on the characteristics of wastewaters to be treated as well as on the sludge activity. The overall morphological characteristics of granular sludges cultivated on corn starch wastewaters were similar to those cultivated on various organic industrial wastewaters such as distillery and sugar.

• Resources Recycling
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• v.13 no.4
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• pp.17-22
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• 2004

This study was focused on the treatment of thickened sewage sludge. General bacteria and E. coli were disinfected over 99％ and organic compounds were decomposed after irradiation. It was suggested that this process can be an alternative for digestion Process. The moisture content in sludge was decreased over 10％ (w/w) and the coagulation of sludge particles was enhanced by irradiation at the dose of 15 kGy and addition of sea waste resource (star-fish) as a dewatering aid.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.57 no.3
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• pp.238-247
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• 2012

To determine the possibility of solidified se wage sludge for use as a soil cover material in reclaimed land, the growth of energy crops and soil chemical properties investigated in each experimental plots during 2 years (2010 and 2011). The experimental plots consisted of the mixing with solidified sewage sludge plot (SS50), the covering with solidified sewage sludge plot (SS100), and the original reclaimed land plot (ORL) on reclaimed land for the intended landfill in Sudokwon Landfill Site Management Corporation (SLC). Plant height, measured in the second year (2011), was highest in the Geodae 1 grown at plots treated with solidified sewage sludge. The growth of energy crops cultivated in both SS50 and SS100 were better than in ORL. The contents of organic matter (OM) and total nitrogen (T-N) at both SS50 and SS100 were considerably higher than that of the ORL over 2 years. However, the soil from ORL showed higher salinity with high contents of exchangeable $Na^+$ cation than that of SS50 and SS100 over 2 years. We consider that soil chemical and physical properties on reclaimed land used in this study could be improved by the application of solidified sewage sludge due to following reasons. Firstly, the application of solidified sewage sludge may provide soil nutrients on reclaimed land i.e. the growth of energy crops better than in ORL, resulted in more OM and T-N contents in SS50 and SS100. Secondly, the top layers mixed or covered with solidified sewage sludge on reclaimed land may be prevented the salinity accumulation due to capillary rise to surface soil, and improved the cultivation layer for effectively propagating the rhizomes of energy crops. Thus the solidified sewage sludge may be a great soil cover materials for cultivation of bioenergy crops in reclaimed land.

• Resources Recycling
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• v.11 no.4
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• pp.17-26
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• 2002

As it is not allowed to landfill sludge from 2001 by the act of waste management, new systems of treating sludge are necessary. Life Cycle Assessment, LCA, is a method for evaluating systems in the aspect of environment and also can apply to decision making tools for policy making. The objective of this study is to assess 3 alternatives of landfill: incineration, composting, solidification by applying LCA. This study is done with operation data from incinerator in Kuri, composting facility in Nanjido, solidification facility in Kimpo and electricity and transport data of Korea in 1998 are used. The results of the LCA is that the composting system is most environmental-friendly and the solidification system is least environmental-friendly.

• Journal of the Korea Organic Resources Recycling Association
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• v.18 no.1
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• pp.98-103
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• 2010

This study was carried out on the composting of the most part of the plant waste materials inflowed-drifting into the dam during the localized heavy rain and the rainy season, due to the abnormal climate change, and for the sewage sludge banned to dispose legally into the ocean from the year of 2012. It was analysed the distinctive physicochemical qualities of the compost with treatment S-1(dam suspended particle sawdust : oak tree bark : sewage sludge : chicken manure = 30 : 20 : 40 : 10) and treatment S-2(dam suspended particle sawdust : oak tree bark : sewage sludge : chicken manure = 30 : 30 : 30 : 10). Both S-1 and S-2 maintained for 10 days at above $65^{\circ}C$ of the compost pile temperature, and the most of its pathogen were destroyed. In case of pH, until the 90th day into composting, S-1 with the pH value of 7.78 was slightly higher than S-2. The C/N value of S-1 was 15.3 and that of S-2 was 16.9. The quality of its final product was satisfied to the manufacture-standards. The GI value of S-1 was 91 higher than that of S-2, which was 84. In conclusion, it is highly recommendable to manufacture S-1 for its frequent usage of dam suspended particle sawdust and sewage sludge, and for its excellent quality and safety.

• Resources Recycling
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• v.21 no.4
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• pp.35-43
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• 2012

This study was carried out for the purpose of obtaining basic data to utilize the AMD sludge as sorbent for heavy metal ions. The sludge from the treatment process of Acid Mine Drainage mainly consists of fine iron hydroxide or iron oxide hydrate and calcite, and the fine iron hydroxide or iron oxide hydrate has a property of adsorbing heavy metal ions. In this study, we investigated the physical property of the AMD sludge like as mineral composition, particle size and shape and chemical composition and also investigated the influence of dosage of sludge, adsorbing time, pH, initial concentration and sintering temperature on the adsorption of heavy metal ions.

• Korean Journal of Agricultural Science
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• v.19 no.2
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• pp.187-193
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• 1992

The effects of continuous restoration of sludge into the reclamating paddy soil and leaching test of sludge components by soil column were investigated. 1. The contents of nitrogen, phosphorus, potassium, C.E.C. and organic matter(O.M.) were increased in/on the paddy soil treated with paper mill sludge than non-treated. 2. Humic layer depth recognized by color showed the non-treated(10 cm), second year(15 cm) and third year(20 cm), respectively. 3. The effects of sludge treatment showed in the contents of O.M. such as non-treatment(0.9 %) < second year(1.39 %) < third year(1.75 %) in 10 cm depth. 4. All components in soil tested with column were increased by holding capacity of sludge, and the contamination effects of soil and ground water were not found by leaching test.

• Journal of the Korean GEO-environmental Society
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• v.23 no.7
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• pp.5-10
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• 2022

The industrial waste is becoming a big problem in the aspect of spatial and environmental in domestic and international. Therefore, the waste reduction and recycling policy has been being implemented as a way to solve this problem. The engineered stone sludge, which is waste, is generated duing the engineered stone production process. since engineered stone sludge is mostly treated by landfill, an increase in the amount of the sludge leads to an increase in landfill sites and treatment costs. therefore, there is a need for a method of resourcization with engineered stone sludge. So, laboratory tests (Plastic and liquid limits, compaction, unconfined compression and permeability test) were conducted to confirm the possibility of using engineered stone sludge mixed with weathered granite soil as a cover material for landfill in this study. The result shows that the mixed soil material with less that 62.5% of engineered stone sludge can be used as a cover material for landfill.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2003.05a
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• pp.92-96
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• 2003

1) 우리나라의 하수슬러지 해양투기량은 발생량의 73%를 상회하고 있으며 최근에 급증하는 추세에 있다. 2) 슬러지를 비롯하여 해양에 투기된 유해성분은 해양생물권 오염도 증가의 큰 요인으로 작용하고 있었다. 3) 해양에 투기된 하수슬러지가 침강하여 퇴적층을 형성하였을 때 저서생태계에 영향을 미칠 수 있는 가능성은 아주 높았다. 4) 슬러지의 중금속 화학형태 분석 결과 생물이 이용 가능한 중금속 비율이 원소에 따라 차이는 있으나 총 함량의 80% 이상을 차지하는 경우도 있었다. 5) 해양생물권의 오염도 증가, 유해성분에 의한 생태계의 악영향 및 투기된 중금속의 높은 생물 이용 가능성 등을 고려할 때 하수슬러지 처리방법의 전환이 필요하였다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2006.05a
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• pp.304-306
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• 2006

본 연구에서는 하수슬러지의 감량화 방안으로 초음파-알칼리 전처리를 통한 하수슬러지의 가용화 특성과 전처리된 하수슬러지의 비메탄활성도(SMA) 실험을 통한 메탄가스 발생 특성을 살펴본 결과 다음과 같은 결론을 얻을 수 있었다. 하수슬러지의 전처리에서 초음파와 알칼리의 단독 전처리보다는 초음파-알칼리 전처리의 경우, 또한 단일주파수 초음파보다는 이중주파수 초음파의 경우 SCOD 가용화율과 처리시간에 있어 더 효과적임을 알 수 있었다. 알칼리(40meq/L NaOH), 초음파(15, 20, 15+20kHz), 알칼리와 초음파 전처리시(15, 20, 15+20kHz with 40meq/L NaOH)시 반응시간 45분에서 하수슬러지의 세포파괴도가 가장 높게 나타난 것은 알칼리(40meq/L NaOH)와 이중주파수 초음파 15+20kHz 전처리로 조사되었으며, 이때 세포파괴도는 98.7%로 나타났다.