Water Quality and Pollution Index in The Grenjeng River, Boyolali Regency, Indonesia
Water Quality and Pollution Index in The Grenjeng River, Boyolali Regency, Indonesia
Water Quality and Pollution Index in the Grenjeng River, Boyolali Regency, Indonesia
Abstract
Grenjeng River is one of the irrigation water resources which is currently polluted by waste from
industrial, livestock and domestic activities. This study aims to assess the quality and index of water
pollution based on physical-chemical and biological parameters in the Grenjeng River, Boyolali
Regency. Sampling of river water was carried out in dry and rainy seasons which were taken at three
observation stations (upstream, middle stream and downstream). Results from laboratory analysis were
compared with water quality standards according to Government Regulation No.82/2001 and quality
status was based on the Pollution Index method in accordance with the attachment to Minister of
Environment Decree No.115/2003. This study shows that BOD of 53-5.7 mg L-1, COD of 49-510.5 mg
L-1 and total coliforms of 540-2,400,000 mL in dry season have exceeded the quality standard water
classes, while in rainy season total coliforms 24,000-240,000 mL have exceeded the standard water for
all water classes. The pollution index of the river water in dry season has reached polluted to extremely
polluted levels and the index of the river water in rainy season has reached moderately polluted to
polluted levels. This condition shows that the practice of dumping waste into river bodies can directly
affect river water quality. The irrigation water source for agricultural must comply with irrigation water
quality standards so that is suitable as irrigation water for plants. Environmentally friendly approach is
needed to prevent worse pollution, which is done by increasing public awareness and business actors in
managing liquid waste by making the integrated wastewater treatment system.
Keywords: environmental monitoring, irrigation water quality, water pollution index
Cite this as: Widodo, T., Budiastuti, M. T. S., & Komariah. (2019). Water Quality and Pollution Index in the
Grenjeng River, Boyolali Regency, Indonesia. Caraka Tani: Journal of Sustainable Agriculture, 34(2), 150-161.
doi: http://dx.doi.org/10.20961/carakatani.v34i2.29186
quality. In previous studies, the dissolved oxygen,              on the Pollution Index can provide information
temperature, biological oxygen demand and total                  about water quality and pollution quality standard
coliforms concentration in rivers were mostly                    threshold, especially the water used for irrigating
higher in dry season compared to those in rainy                  agricultural land.
season (Cobo et al., 2018; Long et al., 2018;
Mukate et al., 2018; Wu et al., 2018; Xu et al.,                 MATERIALS AND METHOD
2018). The quantity and quality of surface water                     This research was conducted from October
and groundwater can be degraded due to several                   2018 to February 2019. Administratively, the
factors such as increasing population,                           research location of the Grenjeng River was in
industrialization activities, urbanization, etc (Jha             Sawahan Village, Ngemplak District, Boyolali
et al., 2005; Flem et al., 2018). Water quality is               Regency, Central Java Province. This location
very important for determining pollution sources                 needs to be investigated because the Grenjeng
for landuses (Sun et al., 2016; Lima et al., 2018;               River belongs to water source for irrigating
Xu et al., 2019).                                                agricultural land. The descriptive research was
    Anthropogenic waste pollution can reduce                     carried out based on observation and laboratory
water quality which is also a very important                     analysis methods. The water sampling technique
problem to be resolved immediately (Blettler et                  followed Indonesian National Standard number
al., 2018). At present 420 billion m3 of wastewater              6989.57/2008 concerning sampling methods for
is discharged into rivers and lakes and there is 550             surface water. Sampling was carried out both in
billion m3 of polluted fresh water every year                    dry and in rainy seasons with one point taken at
worldwide (Ma et al., 2009; Li and Liu, 2018).                   each point (grab sampling) representing the
The supply of clean water in accordance with                     upstream, middle stream and downstream. Water
quality standards plays an important role in the                 samples were collected from water bodies using
sustainable agricultural sector (Lima et al., 2018;              highroute water sampler tool assistance. Each
Vakilifard et al., 2019).                                        segment consisting of three water samples was
    An assessment of appropriate water quality                   taken and then was composited so as to produce a
requires a method in determining the pollution                   volume of 1 litre of every water sampling points.
level. Therefore, the use of water pollution index               Water samples were collected and put in dark
method is greatly useful in determining the                      sample bottle containers. The three water
assessment of the initial status of water quality                sampling points were determined by considering
(Effendi et al., 2015; Li et al., 2016). The                     the terrain to reach the water body and the length
estimated water pollution index presents                         of the segment to make it easier to classify
parameters and data in a simple manner (Singh et                 activities around the river, making it easier to
al., 2005; Sun et al., 2016; Zeinalzadeh and                     inventory pollutant sources both point source and
Rezaei, 2017). Water quality assessment must                     diffuse source. Maps of the research location and
also be followed by continuous monitoring of                     sample points are presented in Figure 1.
water quality so as to create a healthy water                        Water samples were measured using physical-
ecosystem (Behmel et al., 2016). River water                     chemical and biological parameters for quality
quality is also strongly determined by chemical,                 standard according to Government Regulation
physical and biological parameters and is related                (GR) of Indonesian No.82/2001 concerning
to human needs, especially for agricultural                      Management of Water Quality and Water
purposes and daily consumption (Li, 2014; Aznar-                 Pollution Control. Water sample was analyzed in
Sánchez et al., 2019).                                           Laboratory of the Center for Environmental
    The Grenjeng River is a water resource used                  Health Engineering and Yogyakarta Disease
generally to irrigate the surrounding agricultural               Control and the GIFU Laboratory Station of
land. The research related to water quality of the               Universitas Sebelas Maret, located in
Grenjeng River is limited and therefore there is a               Postgraduate Building, 5th Floor, Jl. Ir. Sutami No.
possibility to conduct study about the                           36 A, Kentingan, Surakarta, Central Java,
determination of water pollution index of this                   Indonesia. Some parameters tested are presented
river. This study aims to determine the water                    in Table 1.
quality of the Grenjeng River based on pollution
index method. Water quality management based
Figure 1. Position of water sampling point at three locations along Grenjeng River, Boyolali District.
assessment results can be used as references for                 8.5 (Effendi, 2003; Setiyono et al., 2008). The
water quality. The assessment of pollution index                 results of this study indicate that the pH values of
and status classification is determined based on                 water in both seasons are still in accordance with
Decree of the Minister of Environment                            the quality standards of pH 5-9.
No.115/2003 using formula (1) as follows
(Nemerow and Sumitomo, 1970).                                            9
                                                                   PH
                                                                         3
                                             ….. (1)                     0
                                                                               Upstream   Middle Stream   Downstream
Where:                                                                               Dry Season    Rainy Season
Lij       = concentration of water quality                       Figure 2. The pH values of Grenjeng River water
            parameters stated in the water                                 in dry and rainy seasons.
            quality standard (j)
Ci        = concentration of water quality                           TDS in the dry season ranges from 237-1,071
            parameters survey results                            mg L-1 while in the rainy season ranges from 186-
Lpj       = Pollution Index for designation (j)                  191 mg L-1. TDS is strongly influenced by water
(Ci/Lij)M = maximum value Ci / Lij                               flow, so that a decrease in water flow can increase
(Ci/Lij)R = average value Ci/Lij                                 the value of TDS (Salmani and Jajaei, 2016).
                                                                 Waste disposed from industrial activities greatly
   Determination of status classifications based                 affects the concentration of TDS (Rohmawati et
on score criteria can be seen in Table 2 as follows.             al., 2016). The results of this study indicate that
                                                                 the value of TDS for the rainy season is still in
Table 2. Classification of water quality status                  accordance with the required quality standards
          based on the pollution index (Minister                 which are still below 1,000-2,000 mg L-1, while
          Environment of Indonesian Decree                       for the dry season it is only suitable for class IV
          No.115/2003)                                           water designation which is water that can be used
 Score                Criteria                                   to irrigate crops and / or other designation which
 0.0 ≤ PIj ≤ 1.0      Good water quality                         requires water quality that is the same as that of
 1.0 ≤ PIj ≤ 5.0      Moderately polluted                        use (Figure 3).
 5.0 ≤ PIj ≤ 10       Polluted
 PIj > 10             Extremely polluted
                                                                        1050
                                                                         850
RESULTS AND DISCUSSION
                                                                         650
Water quality
                                                                  TDS
experiences the same thing, which is upstream 22          level, the pollution level in rainy season is only
mg L-1 decreases when entering the downstream             suitable for class IV, whereas during dry season,
segment, leaving 12 mg L-1 left. Concentration is         the BOD concentration is classified as very high,
higher in the upstream area because the area is the       which exceeds 12 mg L-1, and thus, it is not
meeting point between two rivers and in upstream          suitable for all water classes.
areas, there are activities such as industry and
livestock, and practices of household waste                       60
disposal (Mao et al., 2012; Feng et al., 2014;
Wang et al., 2018). Water quality pollutants such                 40
                                                            BOD
as TSS are affected by land use activities in the
upstream area. Although the pollutants are not
                                                                  20
toxic, excessive suspended material can inhibit
the penetration of sunlight which influences
photosynthesis in the waters (Effendi, 2003;                      0
Widiadmoko, 2013; Rügner et al., 2019; Tanjung                             Upstream    Middle Stream Downstream
et al., 2019; Tian et al., 2019). Based on the                                     Dry Season    Rainy Season
suitability of waters for fisheries, the TSS content      Figure 5. The BOD values of the Grenjeng river
of the Grenjeng River water in dry season has little                in dry and rainy seasons.
effect on fishery interests but is still suitable for
class IV water needs (Effendi et al., 2015; Gashi             COD is a very important parameter for
et al., 2016).                                            determining water quality that represents the level
                                                          of organic contamination in water bodies (Zhang
       90                                                 et al., 2017; Dhanjai et al., 2018). The COD
                                                          content of the Grenjeng River in dry season is
                                                          classified as very high, ranging from 49-510.5 mg
       60                                                 L-1, while during rainy season, the COD
                                                          concentration decreases into 8.4-22.8 mg L-1
 TSS
       30
                                                          (Figure 6). The high COD concentrations
                                                          commonly occur in rivers in urban areas that are
                                                          affected by increased waste disposal of domestic,
       0                                                  industrial and livestock activities in the water
            Upstream    Middle Stream Downstream          column (Singh et al., 2005; Gashi et al., 2016; Li
                    Dry Season Rainy Season               and Liu, 2018). Based on the analysis, the COD
Figure 4. TSS values of the Grenjeng River in             level of the Grenjeng River water in rainy season
          dry and rainy seasons.                          is still suitable for all water class designations.
                                                          Meanwhile, the water quality of the Grenjeng
   BOD shows the amount of dissolved oxygen               River in dry season is classified as very poor and
needed by microorganisms in decomposing                   does not match the quality standard because the
organic matter during aerobic conditions                  COD value has exceeded 100 mg L-1.
(Tanjung et al., 2019). The BOD value of the
Grenjeng River water are very high in dry season,                 600
53 mg L-1 (upstream) and 5.7 mg L-1
(downstream), while in the rainy season, the
values experience the same trends, the BOD                        400
                                                            COD
    Phosphate content in river water bodies can be               season and rainy season is still in accordance with
derived from agricultural, industrial and                        the required quality standards, which are still
residential activities (Smith, 2003; Smith et al.,               below 0.01 mg L-1.
2006; Cao et al., 2016; Colborne et al., 2019). The
phosphate content during dry season ranges from                            0,004
0.4 to 3.6 mg L-1, while in rainy season, it ranges
from 1.1-2.6 mg L-1 (Figure 7). Phosphate waste
can indicate nutrient levels and eutrophication in
                                                                  Cd
river water (Lettenmaier et al., 1991; Alexander                          0,0032
and Smith, 2006; Schindler, 2006; Smith et al.,
2006; Wong et al., 2018). Overall the value of
phosphate for the whole season is only suitable for
class IV water designation. It is only in the                             0,0024
downstream segment in dry season that the value                                     Upstream Middle Stream Downstream
is still suitable for water class number III, namely                                       Dry Season  Rainy Season
water that can be used for the cultivation of                    Figure 8. The Cd values of Grenjeng River in dry
freshwater fish, livestock, water for irrigating                           and in rainy seasons.
crops, or other designations that require water
quality that is the same as these uses.                              Chromium (Cr) is one of the heavy metals that
                                                                 is extremely toxic to aquatic organisms and
              4                                                  hazardous to human health (Shadreck, 2014). Cr
             3,5
                                                                 can contaminate water and soil, and the
                                                                 contamination can be caused by industrial
              3
                                                                 processes, such as the textile industry, leather
             2,5
                                                                 tanning, paint manufacturing and stainless steel
 Phosphate
    Plumbum (Pb) or lead is a heavy metal that is         dry and rainy seasons, the water is not suitable for
widely used in the paint manufacturing industry           water classes I, II, III and IV according to GR
and many are found in gasoline to increase octane         No.82/2001.
levels (Said, 2010). The Pb metal content in water
of the Grenjeng River during dry season and rainy                    2500000
seasons has a static concentration of <0.0161 mg
L-1 (Figure 10). Pb heavy metals are very toxic
                                                                     2000000
which can interfere with the nervous system, in
                                                         Coliforms
which the presence of heavy metals is vastly
                                                           Total
dangerous for the environment and humans (Guo                        1500000
et al., 2017; Li et al., 2018; Zhou et al., 2018).
Based on GR No.82/2001, Pb metals contained in
                                                                     1000000
the Grenjeng River water remains within safe
limits.
                                                                      500000
       0,018
                                                                          0
                                                                               Upstream Middle Stream Downstream
       0,012
                                                                                     Dry Season   Rainy Season
 Pb
                                                          Pollution index
          0
               Upstream Middle Stream Downstream
                                                              The water quality status of the Grenjeng River
                     Dry Season  Rainy Season
                                                          in dry season shows that the highest pollution
                                                          index value is at the upstream to the middle stream
Figure 10. The Pb values of the water in the              and the lowest pollution index is at the
           Grenjeng River in dry and rainy                downstream. Based on the category of the
           seasons.                                       Grenjeng River water quality status for class I,
                                                          upstream and middle stream are included in the
    Total coliforms are a group of bacteria               category of extremely polluted, while the
commonly found in aquatic environments                    downstream is included in the polluted category.
produced from human fecal waste, animal feces             For class II, upstream and middle stream are in the
and domestic waste (Messner et al., 2017;                 category of extremly polluted, while downstream
Whitehead et al., 2018; Frena et al., 2019). The          falls into the category of polluted. For classes III
nature of this bacterium has no taste, smell or           and IV, upstream and middle stream are
color so laboratory analysis must be carried out          categorized moderately polluted, as well as the
and the result can be used as a microbiological           downstream.
indicator of a body of water measured in units of             The status of the Grenjeng River water quality
quantities mL (Divya and Solomon, 2016; Xue et            in the rainy season shows that the highest
al., 2018). The total coliform content in Grenjeng        pollution index value is located at the upstream
River during dry season is very high, ranging from        and middle stream, while the lowest pollution
540-2,400,000 mL (Figure 11), while the total             index lies at the downstream. Based on the quality
coliform content in rainy season ranges from              status category, the Grenjeng River water for class
24,000 to 240,000 mL. On the basis of the statistic       I, II, III and IV in upstreams and middle streams
data from the Ngemplak Subdistrict in 2018, there         are in the moderately polluted category.
were 324 pigs, of which 242 were found in                 Meanwhile, the downstream of class I falls into
Sawahan Village. The high content of total                the moderately polluted category, while the
coliform bacteria indicates that this river has been      downstreams of class II, III and IV are included in
polluted by domestic waste and pig farms that             the category of polluted.
drain liquid waste into river bodies in the                   Based on the calculation of the pollution index
upstream to downstream segments so that during            value of the Grenjeng River in the upstream area
special handling is needed to reduce the impact of                   Oceanography, 51(1, part 2), doi: 10.4319/
pollution by liquid waste. During dry and rainy                      lo.2006.51.1_part_2.0639
seasons the upstream area is already, moderately
                                                                 Ali, M. M., Ali, M. L., Islam, M. S., & Rahman,
to heavily polluted, in which many sewers which
                                                                    M. Z. (2016). Preliminary assessment of heavy
drain liquid waste directly into the river water
                                                                    metals in water and sediment of Karnaphuli
bodies are available. Hence, the wastewater
                                                                    River,       Bangladesh.       Environmental
treatment system is needed. Septic tanks are the
                                                                    Nanotechnology,          Monitoring       and
cheapest and most appropriate application for
                                                                    Management, 5, 27–35. https://doi.org/
separating mud, waste from domestic water
                                                                    10.1016/j.enmm.2016.01.002
discharge (Xue et al., 2018; Adhikari and Lohani,
2019). Biogas utilization can also be used as an                 Aznar-Sánchez, J. A., Velasco-Muñoz, J. F.,
alternative in managing waste from livestock, so                   Belmonte-Ureña, L. J., & Manzano-Agugliaro,
that pollution in the upstream area can be                         F. (2019). The worldwide research trends on
suppressed as much as possible (Abdeshahian et                     water ecosystem services. Ecological
al., 2016; Lu et al., 2018). Prevention is also stated             Indicators, 99, 310–323. https://doi.org/
in Regional Regulation of Boyolali District                        10.1016/j.ecolind.2018.12.045
No.13/2015 concerning Environmental Protection                   Behmel, S., Damour, M., Ludwig, R., &
and Management in Chapter 6 of the Second                          Rodriguez, M. J. (2016). Science of the Total
Section Control of Water Pollution Control that                    Environment Water quality monitoring
can be implemented and can be used as the basis                    strategies - A review and future perspectives.
for environmental law certainty.                                   Science of the Total Environment, 571, 1312–
                                                                   1329. https://doi.org/10.1016/j.scitotenv.2016.
CONCLUSIONS
                                                                   06.235
    The water quality of the Grenjeng River in dry
                                                                 Blettler, M. C. M., Oberholster, P. J., Madlala, T.,
season with BOD, COD and total coliform
                                                                    Eberle, E. G., Amsler, M. L., De Klerk, A. R.,
parameters in the upper and middle parts has
                                                                    & Szupiany, R. (2018). Habitat characteristics,
exceeded the water quality standard. While in
                                                                    hydrology and anthropogenic pollution as
rainy season, it is only total coliform that has
                                                                    important factors for distribution of biota in the
exceeded the water standard for all classes of
                                                                    middle       Paraná       River,      Argentina.
water in the upstream section. The irrigation water
                                                                    Ecohydrology and Hydrobiology, 200, 1–11.
source from the Grenjeng River for agricultural
                                                                    https://doi.org/10.1016/j.ecohyd.2018.08.002
land must comply with irrigation water quality
standards so that it is suitable as irrigation water             Cao, X., Wang, Y., He, J., Luo, X., & Zheng, Z.
for plants. Based on these matters, an                             (2016).    Phosphorus      mobility   among
environmentally friendly approach is required to                   sediments, water and cyanobacteria enhanced
prevent worse pollution by increasing public                       by cyanobacteria blooms in eutrophic Lake
awareness and business actors in managing liquid                   Dianchi. Environmental Pollution, 219, 580–
waste by making the integrated wastewater                          587.doi:10.1016/j.envpol.2016.06.017
treatment system.                                                Capangpangan, R. Y., Pagapong, N. K., Pineda,
                                                                   C. P., & Sanchez, P. B. (2016). Evaluation of
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