HIKMAT MEGANDANA_25314705_PAPER DDTL_PPT.pdf

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REACTION KINETICS AND VALIDITY

OF BOD TEST FOR DOMESTICWASTEWATER RELEASED IN MARINE

ECOSYSTEMS REAKSI KINETIK DAN VALIDITAS UJI

BOD UNTUK PELEPASAN LIMBAH DOMESTIKDI EKOSISTEM LAUT

Hikmat Megandana

Master Programme of Environmental Engineering,Institut Teknologi Bandung

Jl Ganesha No. 10, Bandung, 40132

E-mail: [email protected]



INTRODUCTION



PURPOSE

Studies were conducted to evaluate the impact of salinity and temperature on biodegradation of

synthetic organic compound and domesticwastewater commonly discharged into themarine water. This paper presents the findings of BOD exertion of glucose–glutamic acid underspecific salinities expressed in terms of chlorideconcentrations at 20°C and 27°C.



METHODOLOGY

Start

Collecting data of BOD in various concentration of chlorideand temperature

Calculating BOD which decrease by the time invarious chloride and temperature

Calculating bioremediation reaction kinetics ofBOD (k) to the reaction time in variousconcentration of chloride and temperature

Analysis and Conclusion



MATERIAL

The natural seawater with 35–36 parts per thousand (ppt) of salinity hasabout 20,000 mg/L of chlorides. During present study, the chlorideconcentrations were varied to represent creek, estuaries, and oceanconditions.

The experiments were conducted for a 10-day period to achievemaximum exertion of carbonaceous BOD.

To study the BOD exertion pattern under various salinities, the glucose–glutamic acid solution was selected as “test samples.”

In view of the fact that BOD exerted at 20°C for 5 days is equivalent tothe BOD at 27°C for 3 days (CPCB 1991) Central Pollution Control Board,,

temperatures of 20°C and 270 C were considered for incubation. Theincubated samples at various time slots were analyzed for the existenceand adequacy of heterotrophic microorganisms under various chlorideconcentrations using Zobel/nutrient agar media



FORMULA

A first-order BOD decay equation has been widelyapplied to describe the degradation rate of carbona-ceous organic matter for most of the municipal waste.

The BOD curve can be described by a first-orderkinetics equation (Metcalf dan Eddy, Inc. 2003).

Dimana :

y Amount of oxygen consumed (or BOD) at time t

t Time elapsed since the start of the assay

L0 Total amount of oxygen consumed in the reaction

k Reaction constant

d Lo/dt = - k Lo y = Lo (1-10-k t /2.303)



RESULT AND DISCUSSION

1. Percent exertion of BOD for glucose–glutamic acid solution at various chloride

concentrations at 20°C



2. Percent exertion of BOD for glucose–glutamic acid solution at various chloride

concentrations at 27°C27o C



BOD exertion was 10% to 15% higher at 27°C as comparedto 20°C.

BOD decreased with increase in chloride concentration

thereby indicating the negative impact of chlorides on theoxidation of carbonaceous matter.

Huge increase in oxidation of glucose–glutamic acid anddomestic wastewater at 27°C was observed as compared to20°C emphasizing the important role of temperature.

Sudden rise in BOD exertion was not observed after thesixth or seventh day. This indicates that adequate numberof organisms were not present in the system.

Adequate microorganisms were present at higher chlorideconcentrations for the whole test period at both the

temperatures.



3. Values of “k” in exertion of BOD forglucose–glutamic acid solution at various

chloride concentrations at 20°C



4. Values of “k” in exertion of BOD forglucose–glutamic acid solution at various

chloride concentrations at 27°C



Higher values for “k” were observed at 27°Cas compared to 20°C indicating faster rate of oxidation at elevated temperature.

The “k” values had lowered with increase inchloride concentrations.

This finding confirmed the slowing down of the rate of biodegradation of organic matterwith elevation of chlorides (salinity). moretime will be required to break down thepollutants



CONCLUSION

Based on the result, we can see that Tenpercent to 15% higher BOD was observed at 27°Cwhen compared to 20°C for glucose-glutamic acid.

Negative impact of chlorides on the oxidation of organic matter was observed showing decrease inBOD exertion at higher chloride concentrations.

The values of “k” reduced significantly atelevated salinities. Good strength of the associationbetween degradation rate and chloride concentration.

The values of k indicate decreasing trend indegradation with increasing salinities. The findings of the study indicate the necessity for criticalconsideration of slow degradation rates while planningthe disposal options for organic wastes in the marineenvironment



ATTENTION QUESTION THANK YOU



DAFTAR PUSTAKA

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