RESULTS AND DISCUSSION WATER

BEFORE SAMPLE

	DO 0	DO 5	Colour	Conductivity	pH	Temperature	Total Dissolved Solids	Total Suspended Solids	Turbidity
week 1	4.42	2.79	153	756	7.15	23.5	0.0322	0.4217	14.5
week 2	4.42	2.79	470	256	7.15	33	1.45598	0.02	84.2
week3	0.32	2.57	318	92.6	6.8	23.3	0.4925	0.0324	14.5
week 4	0.92	2.79	454	438	6.92	23.3	0.0519	0.1719	45.7
week 5	0.76	0.43	350	738	7.05	23.3	0.1382	0.3012	57.7

9 tests were conducted for treating the water sample of Pasar Jati . For this section we are emphasizing on the before results. The nine tests conducted were BOD, BOD5, Colour, Conductivity, pH, Temperature, Total dissolved solid, Total suspended solid and finally turbidity. Based on the graph been plotted above, for the first test (BOD) it shows that the readings are decreasing from 4.42 to 0.92. This shows that the oxygen demand are decreasing for each week. For BOD5 the results starts with a constant reading for the first week and the second week.

Then, on week 3 the reading plummeted to 2.57 and are continued with an increase reading on week 4. The colour  test reached the highest reading was on week 2 with a reading of 470, continued with  week 4 with 438 and week 3 (318), week 1 (153). The conductivity for the five weeks were increasing instantaneously. The highest reading was taken for week 4 with ( 438). The ph of the water sample are quite changing for each week. The results were taken, and was compared based on the graph.

The highest temperature achieved was on  week 1 with 23.5 celcius. Next, for the Total suspended solid, the data were not stable. It starts with 0.42217, 0.02, 0.034 , 0.1719.From the graph shown ,the result for  Total Dissolved solid was also not stable . The results were taken with the first week’s reading 0.0322, followed by 1.45598, 0.4935 and lastly 0.0519. The turbidity reading s were taken for each week . The highest reading  was 84.2  which was in the second week.

AFTER SAMPLE

	DO 0	DO 5	Colour	Conductivity	pH	Temperature	Total Dissolved Solids	Total Suspended Solids	Turbidity
week 1	7.55	2.18	491	1396	6.58	23.5	0.1133	0.4417	69.6
week 2	2.79	2.18	383	1239	6.5	23.3	4.7954	0.1235	147
week 3	0.84	2.18	383	462	6.5	23.3	5.4553	0.6795	19.6
week 4	2.19	2.18	366	1013	5.52	23.5	0.1763	0.0094	105

The experimental procedure also included the after sample to be tested. It is generally accepted that the DO 0 is much higher than DO 5. For instance in the first week, the DO reading recorded as 7.55 whereas in the following next 5 days it was drop significantly. The probable reason of this event occurring is due to bacteria enclosed in the BOD bottles has limited oxygen. With depleting oxygen content in the bottle, causes the bacteria to die off due to absence of oxygen. Hence, based on the results, the objective of this experiment, which is to determine the DO and BOD level in wastewater, have been successfully achieved. This might be similar to the the next consecutive weeks. 

The reading of colour is almost identical between the range of 495 to 360. Thus is relatively measure of the dissolved colouring compound in water, The result in the first week is higher than others because higher value indicated of higher swamps and bog. It is therefore the increased colour also could interfere with the passage of light thereby impending photosynthesis. Take a closer look on the conductivity. The lowest reading recorded was in week 3. Low value of conductivity depicted on how poor the water to conduct the electric current that flows through it. The prominent reason of this might be due to minimum number of ions that present of their positive and negative charges. Therefore it can be conclude that the higher the conductivity the higher the potential to conduct the electricity as shown in the week 1.

In this experiment, the colour and the pH of water can be directly taken from the pH meter. This may be vary from the each of the water samples. In shorts, the low the pH value will slightly informed that the sample is an acidic while the opposite for this may be true that some alkali properties is present in the sample. The higher pH recorded as 6.58 which represented the sample shown as acidic due to specific pH range which is below than 7. While, the temperature for each the sample is almost similar between the 23,3 to 23.5. This is because the experiment is conducted at room temperature for the tested samples.

As can be seen from the table, the higher the TDS is 5.4553 which tell that hard water, which can cause scale build up in pipes and appliances. Scale build up reduces performance and adds system maintenance and cost. This also has a direct correlation to the purity of water and the quality of water purification systems. TSS on the other hand, higher concentration of suspended solid can lower water quality by absorbing light. Based on the result, in week 3, the highest compared to all, is the less preferable since it can cause many problems for stream health and aquatic life. Turbidity, however, is the highest in week 3 can cause the suspended particles absorb heat from the sunlight, making turbid waters become warmer and so reducing the concentration of oxygen in the water.