Water Quality Issues Related to Special Industrial Zones

In this study water quality of Hlaing River was monitored along the downstream reach during low flow periods and water samples were collected once a week during January and February. Stations for sample collection were fixed after site survey. Th are altogether 14 stations to analyse water quality of the study river reach. The monitoring program includes collection of samples from seven locations along the river into which seven streams discharge. These samples were analysed for a number of wat quality parameters such as temperature, total dissolve solid, total suspended solid, Conductivity, Salinity, pH, BOD, COD and Arsenic. The results of water quality parameters showed significant variation in water quality of the river and the water qual monitoring data were compared to the water quality standards for different uses. It is found that water quality of Hlaing River deteriorates and doesn’t meet the requirements for conserving of living environment due to the pollution from the tributary streams which received wastewater from adjacent industrial zones and newly Satellite town.

INTRODUCTION Surface water quality is influenced by various natural processes and anthropogenic activities. Many places in Myanmar, wastewater is discharged into the natural water bodies which can assimilate and dilute the harmful constituents of the effluents. Thus, municipal and industrial demand for freshwater rises, as effluents of low quality are increasingly disposed In this study water quality of Hlaing River was monitored along the downstream reach during low flow periods and water samples were collected once a week during January and February. Stations for sample collection were fixed after site survey. There are altogether 14 stations to analyse water quality of the study river reach. The monitoring program includes collection of samples from seven locations along the river into which seven streams discharge. These samples were analysed for a number of water quality parameters such as temperature, total dissolve solid, total suspended solid, Conductivity, Salinity, pH, BOD, COD and Arsenic. The results of water quality parameters showed significant variation in water quality of the river and the water quality monitoring data were compared to the water quality It is found that water quality of Hlaing River deteriorates and doesn't meet the requirements for conserving of living environment due to the pollution streams which received wastewater from adjacent industrial zones and newly Satellite Conductivity, BOD, COD, DO, low flow Surface water quality is influenced by various natural activities. Many places in Myanmar, wastewater is discharged into the natural water bodies which can assimilate and dilute the harmful constituents of the effluents. Thus, municipal and industrial demand for freshwater rises, as ncreasingly disposed without proper treatment into the natural water bodies resulting in further degradation of their water quality.
Water quality issue in Myanmar has not yet got its due importance. A comprehensive water quality monitoring program is needed to assess the water quality status of the national rivers.
Rivers and streams are important components of natural environment. They have many values such as economic (fishing, electricity generation, transport and irrigation), aesthetic (recre (biodiversity), water for consumption (water supply for domestic and industrial uses) and conveying wastewater discharges (treated or untreated), urbanization and unsustainable water consumption. Both the effluents flow directly into the water bodies (rivers or canals) through open drains.
The water quality degradation is evident as a result of effluents added in a water body. But the response of water body in terms of its quality for different uses may vary due to numerous factors. These factors include the nature of water body (lake, river, reservoir, sea, etc.), water quality status of the receiving water body, availability of flow, alteration in natural flow, quantity and quality of the added effluents, climatic factors and so on. Some of these factors may be the key determinant of water quality in one condition but they may have a little or no impact in a different condition. Water quality issue in Myanmar has not yet got its due importance. A comprehensive water quality is needed to assess the water quality status of the national rivers.
Rivers and streams are important components of natural environment. They have many values such as economic (fishing, electricity generation, transport and irrigation), aesthetic (recreation), ecological (biodiversity), water for consumption (water supply for domestic and industrial uses) and conveying wastewater discharges (treated or untreated), urbanization and unsustainable water consumption. Both the effluents flow directly into the nearby natural water bodies (rivers or canals) through open drains.
The water quality degradation is evident as a result of effluents added in a water body. But the response of water body in terms of its quality for different uses us factors. These factors include the nature of water body (lake, river, reservoir, sea, etc.), water quality status of the receiving water body, availability of flow, alteration in natural flow, quantity and quality of the added s and so on. Some of these factors may be the key determinant of water quality in one condition but they may have a little or no impact The river system in and around Greater Yangon is schematically shown in Figure 1. Catchment area of the study river is about 700km long. There are nine industrial zones were development within the catchment area. several industrial zones were developed along the bounded rivers and most of the wastewater discharge without. Location of industrial zones are shown in figure. Most of the wastewater from industrial zones discharge without proper treatment to the natural surface water body. Industrial zones left and right bank of Hlaing rivers are tabulated in Table 1. Population density increase significantly due to the development of industrial zones and housing projects domestic wastewater and dumping of garbage into drains are also the source of pollution of it.

III. METHODS AND METHODOLOGY Hypothesis of the study
The hypothesis of the present study is that the flow condition in Hlaing river (temporal factor) and the distance from entry points of the surface drains (spatial factor) significantly affect the water quality condition of the river in context of its different uses.
To test this hypothesis a comprehensive assessment program was initiated. The samples were collected from locations which are up stream of the main inlets along the reach of the river and contributing inlet The flow of river and the contributing drains were observed during low flow months (January and February). The water quality assessment showed the variation of individual water quality parameters, self purification capacity of the receiving river and th comparison with the water quality guidelines for different uses.

Assessment Strategy
Required parameters to be tested were identified and pre-sampling visits were made to:  Identify the location of various surface drain ( point source pollution ).  Select appropriate sampling stations along the river.  Take geological co-ordinates of the selected sampling stations.  Estimate different equipments and material required during the monitoring program. Oct 2018 Page: 441 The river system in and around Greater Yangon is schematically shown in Figure 1. Catchment area of the study river is about 700km 2 and length is 12km . There are nine industrial zones were development within the catchment area. There are several industrial zones were developed along the rs and most of the wastewater discharge without. Location of industrial zones are shown in figure. Most of the wastewater from industrial zones discharge without proper treatment to the natural surface water body. Industrial zones left and right aing rivers are tabulated in Table 1. Population density increase significantly due to the zones and housing projects domestic wastewater and dumping of garbage into drains are also the source of pollution of it.

METHODOLOGY
The hypothesis of the present study is that the flow condition in Hlaing river (temporal factor) and the distance from entry points of the surface drains (spatial factor) significantly affect the water quality of the river in context of its different uses.
To test this hypothesis a comprehensive assessment program was initiated. The samples were collected from locations which are up stream of the main inlets along the reach of the river and contributing inlets. The flow of river and the contributing drains were observed during low flow months (January and February). The water quality assessment showed the variation of individual water quality parameters, self purification capacity of the receiving river and their comparison with the water quality guidelines for

Site Selection
Seven sampling sites along Hlaing river and seven stations inlet drains were selected for the collection of water samples location period (January and Febuary). The geographic co-ordinates of these sampling stations as noted from hand held Geological Positioning System (GPS) device and their distances (set river 1 as 0km) are given in Table 2.

Test Results
Water quality characterization of the Hlaing River was carried out Physical parameters such as temperature, dissolved solid and total solid and chemical parameters such as pH, BOD, COD, Salinity and Arsenic. Table 3 to Table 12 summarizes results of water quality analysis of the river and inlets at selected locations during the low flow season. The data were plotted in Figure 2 to 11 for more elaboration. The figures and tables show individual water quality parameters.
In this study, observations were carried out in small place and the same time and duration within only two months. According to the results, it was found that Temperature values of all observations are almost constant in each and every station.
pH values at all river stations and almost all the inlets lie between 6.5 to 8.5. Therefore water quality status of Hlaing River is neither acidic nor alkaline.
The standard for any purpose in-terms of pH is 6.5 8.5, in that respect; the pH values of some inlet which are tabulated in Table 5 indicate slightly acidic water but still in the range for the different uses for the river.
BOD values of most of the river stations are less than the requirements for conservation of living environment (10 mg/l)(Japanese Water Quality Standards for River) except the samples collected at 13 th January. BOD values of inlet stations are much higher than all of water use classes of Japanese Water Quality Standards for River.
BOD levels of almost all of the stations exceeding the permissible limit of 2mg/l (Table 13) for different uses.
COD value is higher than the permissible for aquatic live, 50 mg/l ( Seven sampling sites along Hlaing river and seven stations inlet drains were selected for the collection of water samples location period (January and Febuary). ordinates of these sampling stations as noted from hand held Geological Positioning System (GPS) device and their distances (set river 1 as 0km) are given in Table 2.
Water quality characterization of the Hlaing River Physical parameters such as temperature, dissolved solid and total solid and chemical parameters such as pH, BOD, COD, Salinity Table 12 summarizes results of water quality analysis of the river and inlets at selected locations during the low flow season. The data were plotted in Figure 2 to 11 for more elaboration. The figures and tables show individual In this study, observations were carried out in small place and the same time and duration within only two months. According to the results, it was found that Temperature values of all observations are almost s at all river stations and almost all the inlets lie between 6.5 to 8.5. Therefore water quality status of Hlaing River is neither acidic nor alkaline.
terms of pH is 6.5-8.5, in that respect; the pH values of some inlets which are tabulated in Table 5 indicate slightly acidic water but still in the range for the different uses for BOD values of most of the river stations are less than the requirements for conservation of living Water Quality Standards for River) except the samples collected at January. BOD values of inlet stations are much higher than all of water use classes of Japanese Water BOD levels of almost all of the stations were found exceeding the permissible limit of 2mg/l-10mg/l COD value is higher than the permissible for aquatic live, 50 mg/l (Table 13) in almost all the river and Dissolved oxygen requirements for aquatic life is 4mg/l (Table 13) and DO level in all stations is higher than the permissible level except one observation. Salinity values are higher than in most of the river stations depending on tidal conditions. Dissolved oxygen requirements for aquatic life is /l (Table 13) and DO level in all stations is higher than the permissible level except one observation. Salinity values are higher than in most of the river stations depending on tidal conditions.    IV. CONCLUSIONS It is founded that pH values are between 6.5 to 8.5 and suitable for drinking, irrigation and aquatic life. BOD values are higher than the 8mg/l in most of the river stations and much higher than in all the inlet streams. COD is also higher than maximum li 50mg/l for aquatic life in most of the river stations and inlets. It can be noted that water quality of the Hlaing river and especially in its tributary streams deteriorates and is not good even for aquatic life. DO values are higher than the minimum requirements for aquatic life in most of the river stations but lower than the minimum limit only in a few observations of river two and inlet two stations. Salinity values are higher than in most of the river stations depending on tidal conditions.
Degradation of water quality of the Hlaing river was found especially in downstream stations and seriously in almost all the inlet streams. BOD and in all the inlet streams are higher than requirements of water quality standards for different use values are much higher in the downstream of the river due to tidal effects. pH and DO values are within the acceptable limit for the aquatic life in most of the river stations and some inlet streams.  Water supply class II; fishery class I; batching and uses listed in B-E 6.5 to 8.5 supply class II; fishery class I; batching and uses listed in B-E 6.5 to 8.5 Fishery class III; Industrial water class I, and uses listed in D-E 6.5 to 8.5 Industrial water class II; agricultural water ; and uses listed in E 6.5 to 8.5 Industrial water class III; conservation of living environment 6.5 to 8.5 It is founded that pH values are between 6.5 to 8.5 and suitable for drinking, irrigation and aquatic life. BOD values are higher than the 8mg/l in most of the river stations and much higher than in all the inlet streams. COD is also higher than maximum limits of 50mg/l for aquatic life in most of the river stations and inlets. It can be noted that water quality of the Hlaing river and especially in its tributary streams deteriorates and is not good even for aquatic life. DO requirements for aquatic life in most of the river stations but lower than the minimum limit only in a few observations of river two and inlet two stations. Salinity values are higher than in most of the river stations depending on tidal Degradation of water quality of the Hlaing river was found especially in downstream stations and seriously in almost all the inlet streams. BOD and COD values in all the inlet streams are higher than requirements of water quality standards for different uses. Salinity values are much higher in the downstream of the river due to tidal effects. pH and DO values are within the acceptable limit for the aquatic life in most of the