• Title/Summary/Keyword: primary wastewater treatment

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Chemically Enhanced Primary Treatment at D Wastewater Treatment Plant (화학적 처리에 의한 1차 하수처리장의 처리효과 개선 -현장시험을 중심으로-)

  • Kwak, Jong W.;Kim, Seung H.;Lee, Chan W.
    • Journal of Korean Society of Water and Wastewater
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    • v.11 no.1
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    • pp.99-108
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    • 1997
  • This study examined the feasbility of upgrading D waste water treatment plant which treats incoming wastewater by primary sedimentation only. By adding 20-40 ppm of Hi-PAX into the outlet of the aerated grit chamber, BOD and SS removal efficiences were improved from 29% and 36% to 53 % and 73%,respectively. However, chemically enhanced primary treatment failed to meet the upcoming wastewater quality standard(BOD and SS <20 mg/l) consistently. This was suspected to result from the deteriorated plant return stream. The wastewater treatment by chemical treatment should have increased the amount of the sludge to be removed as the sludge production was increased. Chemically enhanced primary treatment is anticipated to consistently produce effluent of the 1996 standards quality by adjusting the amount of the sludge to be removed. Besides BOD and SS removal, chemically enhanced primary treatment resulted in the improved T-P removal from 30% to 64-74%. However, such benefit was not observed in T-N removal. Improved T-P removal will be expected to help control water pollution in Masan bay.

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Control strategy of primary clarifier operation in wastewater treatment plant during rainfall inflow (초기강우 유입 시 하수처리시설 일차 침전지 운전제어 전략)

  • You, Kwang Tae;Kwon, Hyuk Jae
    • Journal of Korea Water Resources Association
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    • v.52 no.11
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    • pp.947-950
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    • 2019
  • The main feature of this paper is to provide a driving control strategy to improve the primary clarifier treatment efficiency in the initial rainfall inflow. With the recent development of IoT technology and sensing technology, the basis for operation control of wastewater treatment facilities has been improved. As a result of improving the efficiency of treatment of primary clarifier using on-line measurement results, it is possible to minimize the outflow of untreated sewage and contribute to the improvement of operation efficiency of wastewater treatment plants.

Rice Cultivation with Reclaimed Wastewater Irrigation for Wastewater Reuse (하수처리수의 재이용을 위한 벼 재배시험)

  • Kang, Moon-Seong;Park, Seung-Woo;Kim, Sang-Min;Seong, Chung-Hyun
    • Journal of The Korean Society of Agricultural Engineers
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    • v.46 no.1
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    • pp.75-86
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    • 2004
  • The objective of the research is to develop agricultural resue technologies of reclaiming the effluents from a municipal wastewater treatment plant and reusing for irrigated rice paddies. The Suwon wastewater treatment plant was selected for wastewater reuse tests. The control was the plots with groundwater irrigation (TR#1), the treatment (TR#2) using polluted stream water as it was, and three others using wastewater after treatment. Three levels of wastewater treatments were employed: the effluent from the wastewater treatment plant (TR#3), sand filtering after treatment plant(TR#4), and ultra-violet treatment after sand filtering (TR#5). The randomized block method was applied to wastewater application to paddy rice with five treatments and six replica. The effects of various wastewater treatment levels on water quality, paddy soil, crop growth, yields, and the health hazards were investigated. The primary results indicate that cultivating rice with reclaimed wastewater irrigation did not cause a problem to adverse effects on crop growth and yields. Overall, wastewater could be used as a practical alternative measure for reclaimed wastewater irrigation. However, long-term monitoring is recommended on the effects on soil chemical characteristics and its related health concerns.

Bench-Scale Evaluation of the Activated Sludge Process for Treatment of a High-Strength Chemical Plant Wastewater (활성슬러지법에 의한 고농도 중화학공장 폐수처리에 관한 연구)

  • 조영하
    • Journal of Environmental Health Sciences
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    • v.19 no.3
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    • pp.1-16
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    • 1993
  • This paper describes an investigation to determine whether the activated sludge (AS) process could be used for the treatment of wastewater at the Union Carbide Coporation (UCC) plant in Seadrift, Texas. This plant presently utilizes a waste stabilization pond (WSP) system for treatment of the wastewater. The treatment system consists of an in-plant primary WSP and two off-plant WSPs (secondary and tertiary WSPs), run in series. The total hydraulic detention time of the WSP system is approximately 150 days. Several laboratory-based treatability studies have been conducted to evaluate the performace of the WSP system and the degradability of specific chemical compounds. From an additional study, it was determined that the WSP system was stressed and occasionally operating near the limit of its treatment capacity. The existing primary WSP plays an important role in the overall treatmemt system, because it not only functions as a pH and organic-strength equalization basin, but also serves as a "preconditioning" basin by fermenting high strength organic wastes to volatile organic acids for subsequent degradation in the escondary WSP. However, in view of pending RCRA legislatin conerning the "proposed organic toxicity characteristics limits" (40 CFR Part261: Federal Register, July, 1988), it is possible that the primary WSP will have to be abandoned in favor of alternative treatment options. Therefore the main purpose of this study was to perform activated sludge treatability evaluations for the development of an alternative to the existing primary WSP treatment ststem. In addition, another purpose was to determine the degradability of bis(2-chloroethyl)ether (Chlorex or CX) and benzene(BZ) in the activated sludge process. The presence of these two chemicals in the wastewater of the plant prompted the question of whatedether they could be degraded in an activated sludge system.

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A Study on the Water Pollutant Discharge Inventories for the Improvement of Industrial Wastewater Management System: Primary Steel Manufacturing Facility and Petroleum Refining Products Manufacturing Facility (산업폐수 관리체계 개선을 위한 수질오염물질 배출목록 구축에 대한 연구: 1차 철강 제조업과 석유정제품 제조업)

  • Ahn, Taeung;Kim, Dongmin;Son, Daehee;Kim, Jaehoon
    • Journal of Korean Society on Water Environment
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    • v.36 no.5
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    • pp.453-467
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    • 2020
  • This study aimed to inventory the water pollutant discharge of wastewater from two facilities, one primary steel manufacturing facility and one petroleum refinery, both of which are located in Korea, and to identify ways to improve the wastewater treatment process through field investigation. Probability evaluation was used to inventory the substances in polluted water. The samples collected in this study included original wastewater, on processing wastewater, and treated water. The general description of wastewater occurrence, major sources, and treatment facilities were also investigated to obtain an integrated database of the pollutants created by different industrial categories. Based on our analysis of raw wastewater and final effluent, the detected pollutants were confirmed by analyzing their presence in the raw or supplemental materials, the potential of formation as byproducts, and the possibility of inclusion as impurities. The compounds detected for each category were screened via investigation of their possible sources and confirmed as the final water pollutant inventories. Thirty kinds of water pollutants were emitted by the primary steel manufacturing facility (reference in case A), including 14 specified hazardous water pollutants. The petroleum refinery (reference in case B) emitted 36 water pollutants, including 16 specified hazardous water pollutants.

Removal and Decomposition of Impurities in Wastewater From the HyBRID Decontamination Process of the Primary System in a Nuclear Power Plant (원전 일차계통 HyBRID 제염공정 발생 폐액 내 불순물 제거 및 분해)

  • Eun, Hee-Chul;Jung, Jun-Young;Park, Sang-Yoon;Park, Jeong-Sun;Chang, Na-On;Won, Hui-Jun;Sim, Ji-Hyoung;Kim, Seon-Byeong;Seo, Bum-Kyoung
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.17 no.4
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    • pp.429-435
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    • 2019
  • Decontamination wastewater generated from the HyBRID decontamination process of the primary system in a nuclear power plant contains impurities such as sulfate ions, metal ions containing radioactive nuclides, and hydrazine (carcinogenic agent). For this reason, it is necessary to develop a technology to remove these impurities from the wastewater to a safe level. In this study, it has been conducted to remove the impurities using a decontamination wastewater surrogate, and a treatment process of the HyBRID decontamination wastewater has been established. The performance and applicability of the treatment process have been verified through 1 L scale of replicates and a pilot scale (300 L/batch) test.

Estimation on the Design Capacities of Residuals Treatment Facilities by the Quantity of Dewatered Sludge Generated from Water Treatment Plants (정수장에서 발생된 탈수슬러지의 량에 의한 배출수처리시설용량에 대한 평가)

  • Moon, Yong-Taik
    • Journal of Korean Society of Water and Wastewater
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    • v.18 no.6
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    • pp.715-723
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    • 2004
  • The quantity of residuals generated from water treatment plants depends upon the raw water quality, dosage of chemicals used, performance of the treatment process, method of sludge removal, efficiency of sedimentation, and backwashing frequency. Sludge production by the physical separation of SS occurs under quiescent conditions in the primary clarifier, where suspended solids are allowed to settle and to consolidate on the clarifier bottom. Raw primary sludge results when the settled solids are hydraulically removed from the tank. The relative solid and liquid fractions of a slurry are most commonly described by the solids concentration, expressed as mg/L or percent solids. The purpose of the present investigation is to estimate a suitability on the design capacities of residuals treatment facilities by the quantity of dewatered sludge generated from water treatment plants.

The Study on Decline Plan of Primary Production Organic Matter of Uiam Lake Basin (의암호 유역에서 발생하는 자체생산 유기물 저감방안에 관한 연구)

  • 허인량;이건호;함광준;최지용;정의호
    • Journal of Environmental Health Sciences
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    • v.30 no.1
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    • pp.50-58
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    • 2004
  • The present study was designed to evaluate primary production organic matter in basin of lake around by execution of total maximum daily loading. BOD influent loading of Uiam lake was 2,819 kg/day, which was less then 28.3 percent, total effuluent loading as 3,619 kg/day, in comparision with BOD, total nitrogen influent loading was 4,681 kg/day, which was less then 10.0 percent, total effuluent loading as 5,150 kg/day. But in case of total phosphors influent loading was 73.3 kg/day, which was more then 34.2 percent, total run off loading as 48.3 kg/day. The result of survey reduction plan of primary production organic matter in basin of lake around which objectives of abstract is as follows. First plan was reduction of primary production organic matter by moving the outlet of municipal wastewater treatment center from present place to lake downstream. Secondary plan was improvement by diffusion type of outlet municipal wastewater treatment center. The third plan was reduction of environmental impact by passing and storing of municipal wastewater. Finally plan was decline water surface level which was present hydrouric retention time was reduction from 7.6 day to 6.0 day per meter.

Analysis of the sludge thickening characteristics in the thickener using CFD Model (CFD를 이용한 농축조 슬러지의 유출흐름특성 해석)

  • Park, No-Suk;Moon, Yong-Taik;Kim, Byung-Goon;Kim, Hong-Suck
    • Journal of Korean Society of Water and Wastewater
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    • v.25 no.5
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    • pp.777-782
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    • 2011
  • The residual treatment facilities in WTP(water treatment plant) play an important role in solid-liquid separation. At present, it is difficult to solve problems related with thickening and dewatering of WTP sludge, and discharging waste water to river. The quantity of residuals generated from water treatment plants depends upon the raw water quality, dosage of chemicals used, performance of the treatment process, method of sludge removal, efficiency of sedimentation, and backwashing frequency. Sludge production by the physical separation of SS(Suspended Solid) occurs under quiescent conditions in the primary clarifier, where SSs are allowed to settle and to consolidate on the clarifier bottom. Raw primary sludge results when the settled solids are hydraulically removed from the tank. In this study, Drawing characteristics of the sludge thickening in the thickener of Water Treatment Plants was simulated by Using CFD(Computational Fluid Dynamics.

Validity evaluation of wastewater treatment system applying advanced treatment processes (고도처리공법이 적용된 하수처리시설에서의 공법적용의 적정성 평가)

  • Ahn, June-Shu;Park, Tae-Sool;Cho, Jung-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.10
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    • pp.4055-4068
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    • 2010
  • In this study, validity of wastewater treatment system with advanced treatment processes was evaluated by studying its operational conditions by applying the advanced treatment to the wastewater treatment system which was operating for last several years. Study indicated a fair result for the removal efficiencies of BOD, T-P, and T-N for each unit operation. BOD removal efficiencies for primary clarifier, bioreactor, final effluent are 35, 87, and 48 % respectively. T-P(T-N) removal efficiencies for primary clarifier, bioreactor, final effluent are 18(23), 40(38), and 25(25) % respectively. Further investigation of bioreactor showed that various microorganism such as bacteria, protozoa, and metazoa is present in the bioreactor, and the main function of the media, adhesion (adsorption) of microorganism onto the media, is stabilized. Final effluent quality was lower than the regulation, and BOD, COD, SS, T-N, T-P were 5.5, 9.9, 4.6, 11.8, 0.99 mg/L respectively.