Analysis of Water Quality in the Tabuk River Sub-Watershed, South Barito Regency

The Tabuk River Sub-Watershed is a tributary of the Barito River wich is Located in the Buntok City area of South Barito Regency. The River is Located in a residential area full of river flow Tabuk indicated has increased pollution caused by community activites on the riverbanks such as CWT activities (Cook, Wash, Toilet), Fisheries and tourism. This study aims to analyze the quality of Tabuk river water based on the status of water quality that refers to the decision of the state Minister of Environment No. 115 of 2003, and formulate strategies for controlling the pollution of the Tabuk river flow. The parameters analyzed are physics, chemistry and microbiology, the quality of river water is analyzed at three sampling points during high and low tide conditions. Analysis of river water quality status using the pollution index method. The result obtained are (1) the water quality of the Tabuk River Sub-Watershed for parameters that exceed the Class II water quality standards are TSS, BOD, COD, Total Coliform, Fecal colifirm during tidal or low tide conditi ons. TSS parameters 382 mg/L at low tide, and 157 mg/L at high tide. The BOD parameter is 61.5 mg/L during low tide, and 9.4 mg/L at high tide. The COD parameter is 83.7 mg/L during low tide, and 74 mg/L at high tide wich indicates a decline in water quality with moderate to mild water quality status. (2) efforts and strategies for the quality of tabuk river water to be in accordance with water quality standard criteria, namely (a) monitoring and maintaining Tabuk river water quality during low tide and tid e conditions, (b) controlling domestic and nondomestic waste entering the river sub-watershed Tabuk, (c) establishes the concept of community participation as a reference for each agency that has an interest in carrying out river management activities. Keywords— Sub Watershed, Water Quality, Water Quality Status, Water Pollution Control .


INTRODUCTION
The life of the people of the south Barito Regency in is inseparable from the existence of the river. With a population of 134.543 people and an are of 1829 km 2 (Statisticts Indonesia, 2018). Most people use river water as a source of clean water and some others use rainwater and surface water sources.
The river passes through 3 villages, namely Buntok Kota with a total of 16,621 people, which is a densely populated area. Downstream Sper with a population of 14,738 people, is a residential area, where the river is used by the community as a place of fish ing in the river body, namely the existence of several fishponds around the river. Pamait with a population of 862 people, which is a small residential area and is used by the community as a place for bathing tourism.
Statistics from the South Dusun District, 2017 states that the number of houses living along the river is 217 houses in Buntok Kota, 79 houses in Hilir Sper, and 70 houses in Pamait. The average community that lives around the Tabuk riverbank has a place to stay facing the river, As a result, the potential of the community to dispose of garbage into the river is getting bigger, especially in gray water and black water waste as well as washing activities of BWT (Bathing, Washing, and Toilet) which can potentially produce liquid waste entering th e river body.
Increased activity around the river can cause a decrease in the quality and quantity of the river. Water quality is a term to describe the suitability or suitability of water for certain uses, such as drinking water, fisheries, irrigation / irrigation, recreation and so on (Juanda, 2014). Besides the lack of knowledge, and research and public awareness of the condition of polluted rivers can cause the river does not meet quality standards or can not be used for certain needs, which will ultimately affect the surrounding community in using river water as daily necessities.
Maintaining or achieving water quality so that it can be used sustainably in accordance with the desired level of water quality, it is necessary to preserve and or control efforts. Preservation of water quality is an effort to maintain the function of water so that the quality remains at its natural condition. Water pollution control is carried out to guarantee water quality to conform to water quality standards through efforts to prevent and control water pollution and to restore water quality.

II.
RESEARCH METHOD The study was conducted using descriptive data analysis explaining the water quality and quality status o f the Tabuk River Sub-Watershed. Water quality research was conducted at three monitoring points by dividing into two segments namely at low tide and tide, the following 3 (three) monitoring points for sampling the Tabuk River watershed in this study ( Figure 1). As follow:

Fig.1: Sampling Location
The sampling method used is the Grab Sampling method, the method of taking samples for a moment that is directly taken from the body of water being monitored (Effendi, 2003). The sampling point is based on SNI procedures. 57. 6989. 2008 which can be seen in Table 1.
where Lij: concentration of water quality parameters stated in Water Designation Standards (j) and Ci: concentration of water quality parameters (i), PIj is Pollution Index for designation (j), With (Ci / Lij) R: value, Ci / Lij average and (Ci / Lij) M: value, maximu m Ci / Lij. The data analysis method used in formulating a strategy for controlling pollution in the Tabuk River Sub-Watershed is a SWOT (Strength, Weakness, opportunity, Treat) analysis. SWOT analysis is the systematic identification of various factors to formulate a management plan (3).

III. RESULT AND DISCUSSION 1) Analysis of Water Quality in the Tabuk River
Sub-Watershed The results of water quality measurements on BOD, COD, TSS, total Coliform and fecal coliform at each monitoring point are compared with Class II river water quality criteria. As seen in Table 2 about the analysis of water quality at high tide and Table 3 at low tide conditions.

Total Suspendied Solid (TSS)
Analysis of the TSS parameters shows that the TSS concentration has increased to exceed the limits of the specified water quality standard. The increase in the value of TSS is due to the downstream so many land use changes become densely populated areas so that the community activities there in also increase which causes soil solids entering.
Habits of the community that function as a place for bathing, washing, toilet (BWT) and as fisheries and rubbish dumped directly into the river will pile upstream, causing the highest TSS value in the downstream of the Tabuk river.

Biochemical Oxygen Demand (BOD)
Tests on BOD parameters are known to increase from upstream to downstream and during low tide conditions it is known that BOD values are higher than BOD values at high tide. This indicates that the Tabuk river water has been polluted by waste disposal, both waste originating from tourism, fishery activities, and domestic waste generated by community activities along the river banks.
The results of the BOD test during low tide and tide conditions when compared with the class II water quality standards have passed the quality standard limit of 3 mg / l. the greater levels of BOD indicate that the indicated waters have been polluted especially in the downstream areas at low tide of 61.5 mg / l. the increase in BOD value at low tide can be caused by the disposal of organic waste originating from household waste where it is known that the downstream area is a densely populated area on the banks of the river and many of the houses make the kitchen enter the river, so that the direct household waste water goes directly to the river. In addition, the existence of aquaculture and leftover food derived from aquaculture also affects the high content of BOD. Organic wastes are generally in the form of waste that can rot or be degraded by microorganisms so that when discharged into water it will increase BOD (4).

Chemical Oxygen Demand (COD)
COD concentration levels showed an increase from upstream to downstream both at low tide and at high tide. Increased levels of COD from upstream to downstream, can indicate that the Tabuk river water has been polluted due to waste disposal from upstream, where the upstream area is an area that contributes organic and non organic waste due to tourism activities. Then the flow of river water flows to the middle area where there is community activity in fish farming that can cause COD content to increase, because in these activities there is feeding which can cause the accumulation of leftover feed in the river which will eventually rot.
In the downstream areas there was a high increase of 74 mg / l during high tide conditions and 83 mg / l during low tide conditions this could be due to increased domestic waste disposal in downstream areas and is a densely populated area along the river. The high value of COD in waters is caused by the large amount of pollutants entering the waters, especially organic pollutants from household waste and aquaculture (5).

Total Coliform
The total coliform when tested was known when the tide conditions ranged from 1300-2200 MPN/100 ml from upstream to downstream. In these areas still meet the water quality standards for class II. So that for the tourism and fisheries areas it is still safe to be used as a cultivation and tourism activity. If it exceeds grade II water quality standards, it will cause disease both for tourism and fish farming. Because for fish farming must also pay attention to environmental health in order to be safe for consumption of fish. Success in fish farming is from maintaining environmental health from bacterial diseases (6). Communities that build latrines in rivers will cause rivers to be polluted with human excrement higher by indicating high total coliforms (7). The bacterial density indicates the suitability of water for drinking water, recreation, and fisheries.

International Journal of Environment, Agriculture and Biotechnology (IJEAB)
Vol -4, Issue-5, Sep-Oct-2019  https://dx.doi.org/10.22161/ijeab.45.4  ISSN: 2456-1878 www.ijeab.com Page | 1323 The bacterial density indicates the suitability of water for drinking water, recreation, and fisheries. Where the results are compared with the class II water quality standard of 1000 MPN / 100ml it has exceeded the water quality standard set by Government Regulation No. 82 of 2001.
If it is found that the density of bacteria exceeds the quality standard threshold, then the waters are not suitable for cultivation activities because they can cause mass death of the seeds and a decrease in the quality of post-harvest biota (8). Bacterial content is influenced by the volume of water, when the volume of water is high it has a lower bacterial content compared to when the volume of water drops (9).

2). Quality Status Analysis of the Tabuk River Sub Watershed
The test results from the Tabuk river water samples, it is known that parameters that exceed the Class II water quality standards are TSS, BOD, COD, Total Coliform, Fecal coliform during tidal or low tide conditions.
The test results of the Tabuk river water samples at high tide and low tide the river pollution status using. Pollution Index calculation is the quality of tabuk river water when the tidal conditions are mild polluted, while the status of Tabuk river water quality at low tide conditions is mild polluted in the upstream and middle regions, however, in the downstream area the status is moderate, which can be seen in Table 4. The level of pollution obtained based on calculations is known that the condition of the Tabuk river water at low tide is higher than during tidal conditions. This is due to the condition of the water when the tide has high water discharge and high rainfall can also cause dilution so that it can reduce the level of pollution. Whereas during low tide the water has a low flow of water and the flow of community waste goes directly to the river which will flow from upstream to downstream so that it is piled upstream downstream, this can cause pollution in the downstream area.

3). Formulation of River Water Pollution Control Strategies
Water Pollution Control is an effort to prevent and control water pollution and water recovery to ensure water quality in accordance with water quality standards (10). Based on the results of the water quality testing of the Tabuk River Sub-Watershed, interviews and literature studies, it can be described and presented in Table 5 as follows: The results of the strategies above, the policies to support the management of the Tabuk river water must involve the community and the government in paying attention to the sustainability of natural resources, such as: 1) Monitoring and maintaining water quality in the Tabuk River Sub-Watershed during low tide and tidal conditions at many community activities. 2) Control of domestic and non-domestic waste entering the Tabuk River Sub-WaterShed. Such as the socialization and construction of sewerage in residential areas that are covered by rivers. 3) Establish the concept of community participation as a reference for each agency that has an interest in carrying out river management activities. Further research can be done related to community behavior patterns that exist around the Tabuk River Sub-Watershed

IV. CONCLUSION AND SUGGESTION CONCLUSION
1. The condition of water quality in the Tabuk River Sub-Watershed that the parameters that exceed grade II water quality standards are TSS, BOD, COD, Total Coliform, Fecal coliform during tidal or low tide conditions. 2. Pollution status in river Sub-Watershed at the upstream sampling point at high tide shows mild pollution, the middle sampling point at high tide indicates light pollution, the downstream sampling point at high tide shows mild contamination, the upstream sampling point at low tide indicates light polluted. the middle sampling point at low tide shows mild pollution, the downstream sampling point at low tide shows medium polluted. 3. The strategy for controlling the pollution of the Tabuk River Sub-Watershed is to monitor and maintain the water quality of the Tabuk River during low tide and tide conditions. 4. controlling domestic and non-domestic waste entering the Tabuk Sub-Watershed, establishes the concept of community participation.

SUGGESTION
Further research can be done related to community patterns that exist in the Tabuk river Sub watershed.