• 상하수도학회지
• /
• 제28권1호
• /
• pp.135-142
• /
• 2014

The performance of inorganic sludge separation system is evaluated. Anaerobic digester effluent sludge is used for feed sludge of this system and hydrocyclone is used for inorganic sludge separation. For phosphorus removal and recovery $MgCl_2$ is pumped into MAP growth tank, a component of inorganic sludge separation system. Using this system inorganic sludge which contained less than 40 % of organic matter can be discharged stably and the maximum amount of separated inorganic sludge is 13.4 % of influent sludge based on dry solid. The amount of phosphorus recovered as MAP(as P) is 16.7 % to influent T-P.

• 상하수도학회지
• /
• 제28권4호
• /
• pp.411-417
• /
• 2014

The performance of the new aerobic digestion system combined with inorganic sludge separation unit and sludge solubilization unit, CaviTec II, is evaluated. Anaerobic digester effluent sludge is used for feed sludge of CaviTec II system. By addition of CaviTec II, the amount of cake generated is reduced by 27%, and the soluble nitrogen is reduced by 92%.

• 한국환경보건학회지
• /
• 제41권5호
• /
• pp.327-334
• /
• 2015

Objectives: In order to review both the effects of sewage sludge dewaterability and deodorizing ability in the existing advanced sewage treatment process, BIO-CLOD (a solidified mixture of 10% Bacillus concentrate and inorganics) was used as an inorganic conditioner effective for deodorization treatment in addition to the removal of organic matter and nutritive salts. Methods: Sludge dewaterability was evaluated using specific resistance to filtration (SRF) experiments with six agitators and two types of commercially available BIO-CLOD; one that is made by grinding solid matter (powdered BIO-CLOD) and one that has been obtained by sieving a separation with a particle diameter of 100 mesh (100 mesh BIO-CLOD). For deodorization odor treatment experiments, 20 g of commercially available solid BIO-CLOD was submerged in four liters of sewage sludge and mixed and agitated for 45 days. Results: When BIO-CLOD was injected into sewage sludge to experimentally compare specific resistance to filtration (SRF), the optimum amount of BIO-CLOD to be injected was shown to be 2% w/v and the SRF value in this case was $1.35{\times}10^{12}m/kg$. pH changes following BIO-CLOD injection were within 6.5-7.0. By 14 days after submerging BIO-CLOD into the sewage sludge to evaluate its deodorizing ability, $H_2S$ decreased by 68% and methyl mercaptan decreased by 74%. By 45 days after the submergal, both items decreased by 100%, indicating deodorizing ability. Conclusion: To compare the levels of dewaterablity of sewage sludge at different particle sizes of inorganic conditioner, powdered BIO-CLOD, particle size 100 mesh BIO-CLOD, and bentonite were tested. It could be seen that as the powdered BIO-CLOD increased, the precipitability increased up to 62% in 30 minutes. As an inorganic conditioner, BIO-CLOD was identified as a stable sludge conditioner that does not affect pH.

• 미생물학회지
• /
• 제51권4호
• /
• pp.374-381
• /
• 2015

국내의 경우 항만과 연안해역 준설로 인하여 연간 수 천만톤 이상 준설토사가 발생하며 매년 증가하고 있으나, 대부분 투기장에 장기간 방치되며, 더구나 2012년부터 런던협약에 의해 해양투기가 금지되고 있어 환경친화적인 준설토처리 및 재활용기술개발이 시급하다. 준설토 재활용기술에서는 중간처리과정후 발생하는 현탁수(유기물과 중금속 함유 $10{\mu}m$ 미만 미세오염퇴적물 포함)의 처리가 필요한데 현재 이 기술은 연구되어 있지 않다. 본 연구에서는 복합유용미생물제제(BM-S-1)을 이용하여 미세해양오염퇴적물($10{\mu}m$ 이하 입자)내 오염되어 있는 유기물질, 영양염류 및 중금속을 정화하여 배출함으로써 오염퇴적물 정화처리수 방류수질 기준을 충족하고자 하였다. BM-S-1 복합미생물제제를 이용한 해양준설토의 친환경정화시스템으로서 일일 50 L 처리용량의 Lab scale 실험장치를 HRT 6.5일, BOD 용적부하 $0.2-0.6kg/m^3{\cdot}day$의 조건으로 생물반응기를 100일 이상 운전하였다. SCOD, T-N 및 T-P의 제거효과는 각각 96.1%, 92.0% 및 79.0%로 나타나 오염미세퇴적토 내의 유기물의 처리효과가 매우 양호하였다. 또한 몇 가지의 중금속(Zn, Ni 및 Cr) 처리에도 효과적이었다. 아울러 물리적으로 분리하기 어려운 $10{\mu}m$ 이하의 미세토양의 고액분리가 가능함을 확인하였다. 미생물군집구조를 분석한 결과 Flavobacteria 및 Gammaproteobacteria 강이 매우 우점하였으며, 이들에 속한 미생물종들은 해양 내의 각종유기물(다당류, 단백질 및 기타 생물중합체)을 처리하는 것으로 알려졌다. 따라서 본 실험에서 사용된 BM-S-1 미생물제제와 처리시스템은 고농도의 염분이 함유되어있는 유기물 및 중금속 오염 해양퇴적물 정화에 효율적으로 적용가능한 것으로 판단되며, 정화, 분리된 미세해양퇴적물은 목적에 맞게 재사용 가능할 것으로 사료된다.