• Title/Summary/Keyword: Chemical oxygen demand

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A Study on the Water Pollution Characteristics of the Taewha River - Chemical Oxygen Demand and Chloride ion Concentration - (태화강의 수질오염 특성에 관한 연구 - 화학적 산소요구량과 염소이온 농도 -)

  • 류석환
    • Journal of Environmental Science International
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    • v.2 no.4
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    • pp.291-297
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    • 1993
  • The COD values and chloride ion concentrations of the Taewha river flowing through Ulsan area were determined along the main stream and the relationships between CODs and chloride ion concentrations were described. The results showed that the middle-upper stream and downstream of the Taewha river were polluted deeply with municipal sewage and self-purification occured in the middle-downstream of the river. When domestic sewage is a main source of pollutants, and is especially the only source of chloride in the stream water, the ratio of COD/[$\textrm{Cl}^{-}$] will be utilizable as a measure of self-purification of the stream.

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Impact of Current Density, Operating Time and pH of Textile Wastewater Treatment by Electrocoagulation Process

  • Hossain, Md. Milon;Mahmud, Md. Iqbal;Parvez, Md. Shohan;Cho, Haeng Muk
    • Environmental Engineering Research
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    • v.18 no.3
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    • pp.157-161
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    • 2013
  • Treatment of textile wastewater by the electrocoagulation (EC) process is being investigated by this experimental study. The objective of this experiment is to observe the efficiency of the EC process in removing chemical oxygen demand (COD) and turbidity. In this experiment an iron electrode is used in the EC process, and different working parameters such as pH, current density and operating time were studied in an attempt to achieve a higher removal capacity. The results show that the maximum COD removal occurred at neutral pH at operating time 30 min. COD and turbidity removal reaches at maximum, with optimum consumption of electrodes, between current density 85-95 $A/m^2$, and only trace amounts of metals were determined in the EC treated effluent.

양돈 폐수 처리를 위한 Rhodospirillum rubrum N-1의 분리 및 특성 연구

  • Choi, Kyung-Min;Yang, Jae-Kyung;Park, Eung-Roh;Bang, Keuk-Soo;Lee, Sung-Taik
    • Microbiology and Biotechnology Letters
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    • v.25 no.3
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    • pp.322-327
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    • 1997
  • Photosynthetic bacterium strain N-1 was isolated from the eutrophic wet soil and identified as Rhodospirillum rubrum. The optimum conditions for the cultivation of R. rubrum N-1 were estimated as 0.2% (w/v) of sodium acetate, 0.2% (w/v) of sodium propionate, 0.2% (w/v) of sodium butyrate in the Lasscelles basal medium at 30$circ$C, pH 7.0 under 4000 lux of the illumination. The removal efficiencies of total organic acid and chemical oxygen demand (COD$_{Cr}$) in swine wastewater were 80% and 87%, respectively, when 10% (v/v) of R. rubrum N-1 was inoculated.

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A Numerical Simulation of Marine Water Quality in Ulsan Bay using an Ecosystem Model (생태계모델을 이용한 울산만의 수질 시뮬레이션)

    • Journal of Korean Port Research
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    • v.12 no.2
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    • pp.313-322
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    • 1998
  • The distributions of chemical oxygen demand (COD) and suspended solid (SS) in Ulsan Bay were simulated and reproduced by a numerical ecosystem model for the practical application to the management of marine water quality and the prediction of water quality change due to coastal developments or the constructions of breakwater and marine facilities. Comparing the computed with the observed data of COD and SS in Ulsan bay the results of simulation were found to be good enough to satisfy the practical applications.

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Comparing geometric parameters of a hydrodynamic cavitation process treating pesticide effluent

  • Randhavane, Shrikant B.
    • Environmental Engineering Research
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    • v.24 no.2
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    • pp.318-323
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    • 2019
  • Paper focuses on comparison between two different orifice plate configurations (plate number 1 and plate number 2) used as cavitating device in the hydrodynamic cavitation reactor for improving pollutant removal efficiencies. Effect of four different parameters such as hydraulic characteristics (in terms of range of flow rates, orifice velocities, cavitation number at different inlet pressures); cavitation number (in range of 5.76-0.35 for plate number 1 and 1.20-0.35 for plate number 2); inlet pressure (2-8 bars) and reaction time (0 to 60 min) in terms of chemical oxygen demand (COD) removal and chlorpyrifos degradation has been studied and compared. Optimum inlet pressure of 5 bars exists for degradation of pollutants for both the plates. It is found that geometry of orifice plate plays important role in removal efficiencies of pollutant. Results obtained confirmed that orifice plate 1 with configuration of 1.5 mm 17 holes; cavitational number of 1.54 performed better with around 60% COD and 98% chlorpyrifos removal as compared to orifice plate 2 having configuration of 2 mm single hole; cavitational number of 0.53 with 40% COD and 96% chlorpyrifos in 2 h duration time.

Remediation capabilities of pilot-scale wetlands planted with Typha aungstifolia and Acorus calamus to treat landfill leachate

  • Bhagwat, Rohit V.;Boralkar, Dilip B.;Chavhan, Ram D.
    • Journal of Ecology and Environment
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    • v.42 no.4
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    • pp.191-198
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    • 2018
  • Improper management and unsanitary approaches are implemented in disposal of leachate, which has resulted in groundwater pollution at village Uruli Devachi, Pune, India. Various physico-chemical treatment methods are commercially available for leachate treatment. However, the application of biological methods viz. phytoremediation to the municipal solid waste landfill leachate has been limited. We report the remediation ability of Typha aungstifolia and Acrorus calamus that is capable of reducing hazardous constituents from the landfill leachate. After 96 h of hydraulic retention time (HRT), it was observed that T. aungstifolia-treated sample showed high reduction potential in reducing biochemical oxygen demand, chemical oxygen demand, hardness, total dissolved solids, Na, Mg, Ca and Ni whereas A. calamus showed greater reduction capacity for alkalinity, Cl, Cu, Zn and Cr. Furthermore, it was also observed that T. aungstifolia withstood longer HRT than A. calamus. In situ application of T. aungstifolia and A. calamus for remediation of landfill leachate carries a tremendous potential that needs to be further explored.

Effect of seeding ratio on acidogenic biokinetics in high ammonia concentration

  • Yang, Keun-Young;Shin, Seung-Gu;Hwang, Seok-Hwan
    • 한국생물공학회:학술대회논문집
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    • 2005.04a
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    • pp.65-66
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    • 2005
  • Anaerobic digestion is one of the well-known methods for biological treatment handling of concentrated organic matter such as swine $wastewater.^{1)} The anaerobic digestion can reduce organic loading but also hydrolyze non-biodegradable organic $matter.^{2)}$ The feces from the scrapper-type barn are usually collected to make compost and the urine is discarded with swine-slurry wastewater by ocean-dumping or treated by biological methods. The lagoon, aerobic digestion, anaerobic digestion, SBR, $A^{2}/O$, and UCT have been applied for treating swine $wastewater.^{3)} In this study, as a result of the analysis of swine wastewater, the total and soluble chemical oxygen demand was 130g/L and 60g/L, respectively. And the volatile fatty acid as chemical oxygen demand equivalent was 45g/L, which was 75% of soluble chemical oxygen demand. Before everything else, ammonia nitrogen concentration was 6.5 g/L. From biochemical acidogenic potential test, it was concluded that the enhanced acidification process to manage swine waste should be operated in the ammonia nitrogen concentration of less than 1.2 g/L. In the result of seeding ratio experiments with artificial $wastewater^{4)}, the lag period of acidogens was taken the long time because of the inhibition by the $ammonia^{5)}$, however no difference of period by the seeding ratio was not shown. The Haldane-based biokinetics were also evaluated using a method of fourth order Runge-Kutta $approximation.^{6,7)}$ The nonlinear least squares (NLLS) method with a 95% confidence interval was also used. The ranges of maximum microbial growth rate, ${/mu_{max}}$, and half saturation coefficient, $K_{s}$, for acidogenesis of various seeding ratio with artificial wastewater were 6.1 ~ 12.6 $d^{-1}$ and 45,000 ~ 53,500 mg glucose/L, respectively. Also, the methanogenic microbial yield coefficient, Y, and microbial decay rate coefficient, $k_{d}$, and inhibition substrate concentration, $K_{si}$, for the reactors were determined to be 0.32 ~ 0.465 ${/mu}g$/mg glucose; 0.42 ~ 1.01 $d^{-1}$ and 51,500 ~ 55,600 mg glucose/L, respectively.

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Feasibility of Composting Combinations of Sewage Sludge, Cattle Manure, and Sawdust in a Rotary Drum Reactor

  • Nayak, Ashish Kumar;Kalamdhad, Ajay S.
    • Environmental Engineering Research
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    • v.19 no.1
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    • pp.47-57
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    • 2014
  • The aim of this paper was to study the effect of five different waste combinations (C/N 15, C/N 20, C/N 25, C/N 30, and control) of sewage sludge coupled with sawdust and cattle manure in a pilot scale rotary drum reactor, during 20 days of the composting process. Our results showed that C/N 30 possesses a higher temperature regime with higher % reduction in moisture content, total organic carbon, soluble biochemical oxygen demand and chemical oxygen demand; and higher % gain in total nitrogen and phosphorus at the end of the composting period implying the total amount of biodegradable organic material is stabilized. In addition, $CO_2$ evolution and oxygen uptake rate decreased during the process, reflecting the stable behavior of the final compost. A Solvita maturity index of 8 indicated that the compost was stable and ready for usage as a soil conditioner. The results indicated that composting can be an alternate technology for the management of sewage sludge disposal.

The Change of Coastal Water Area due to the Development of Mokpo Harbor and Construction of Daebul Industrial Complex(II) (木浦港 開發 및 大佛産業團地 造成에 따른 沿岸海域 變化(II) - 海上環境을 中心으로 -)

  • 이중우;정명선;민병언
    • Journal of the Korean Institute of Navigation
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    • v.16 no.1
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    • pp.37-64
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    • 1992
  • A study on the changes of the oceanographical environment caused by Mokpo coastal zone development was carried out. Special emphasis was placed on the clarification of the water level changes and coastal current structure and influence of the environmental factors on the coastal area. In order to understand the structure oceangraphical environemnt, such as water temperature, salinity, suspended solids, pH, dissolved oxygen, chemical oxygen demand, biochemical oxygen demand, distribution of bottom sediment, tide and current were measured. To investigated the structure of tide and current for the future development, a numerical analysis was carried out. In certain zones, it was found to be flooding problems near the lowlying commercial area.

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Influence of Landuse Pattern and Seasonal Precipitation on the Long-term Physico-chemical Water Quality in Namhan River Watershed (남한강 수계에서 장기 이화학적 수질특성에 대한 토지이용도 및 계절성 강우의 영향)

  • Lee, Ji-Eun;Choi, Ji-Woong;An, Kwang-Guk
    • Journal of Environmental Science International
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    • v.21 no.9
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    • pp.1115-1129
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    • 2012
  • The objective of this study was to analyze long-term annual and seasonal trends of water chemistry on landuse patterns and seasonal precipitation using 72 sampling sites within Namhan River watershed during 2001-2010. Water quality, based on multi-parameters of water temperature(WT), dissolved oxygen(DO), biochemical oxygen demand(BOD), chemical oxygen demand(COD), suspended solids(SS), total nitrogen(TN), total phosphorus(TP), and electric conductivity(EC) varied largely depending on monsoon rain and landuse patterns such as forest, cropland, and residence. Concentrations of BOD and COD as an indicator for organic matter pollution, increased during summer monsoon season at the cropland and residential streams. Values of TN and TP were higher in residential streams than in the forest and cropland streams. In the meantime, DO values had weak relations to the landuse patterns of forest and cropland cover. Water quality was worst in cropland and residential streams, and also most degradated in 4th order streams. Overall, our results suggest that efficient water quality management is required in the cropland and residential landuse streams.