1.Water Quality Status Before the Pollution Occurs

Before the pollution happen, Sungai Rambai would have been a healthy, vibrant river. The water would have been clear, allowing sunlight to reach the plants and support their growth. Oxygen levels would have been high enough to sustain fish, insects, and other aquatic life. The pH of the water would have been balanced, around 6.5 to 7.5, making it ideal for most river species. Nutrient levels like nitrogen and phosphorus would have been in harmony, helping plants grow without causing algae blooms. Overall, the river would have supported a wide variety of fish, plants, and microorganisms, maintaining a healthy and thriving ecosystem. 

 2. Pollution Occurrence

The pollution that occured in Sungai Rambai are directly linked to the waste that caused by the nearby pig farms. Pig farms in the region were suspected of improper waste management practices that leading to nutrient-rich waste (such as manure) and other pollutants being washed into the river. The Department of Veterinary Services (DVS) took action to address the pollution by overseeing farm practices and ensuring that measures were in place to reduce further contamination.

3. Chemical Properties of the Pollutants

• Nutrients: Pig dung contains nitrogen and phosphorus, which can pollute the environment and result in eutrophication, or an overabundance of algae.

• Ammonia: A poisonous byproduct of animal excretion that can damage aquatic life and reduce oxygen levels.

Pathogens: Bacteria from contaminated feces, including Salmonella and E. Coli.

• Hormones and antibiotics: These chemicals employed in pig farming have the potential to enter rivers, impact aquatic life, and exacerbate antibiotic resistance. 

4. Sources of Pollutants 

The local pig farms are the main cause of pollution in the area. Pollutants enter rivers mostly through rainfall-induced runoff, poor waste management, and insufficient waste treatment systems. 

5.Pollutant Screening and Detection Methods 

• Regular water sampling:  To measure levels of nutrients, ammonia, and other chemicals.

• Microbial testing: To test the pathogens such as E. coli and Salmonella.

• Chemical analysis: Chemical testing for pharmaceutical residues, including antibiotics.

 and any other pharmaceutical residues.

• Monitoring for algae blooms:  Which may indicate eutrophication. 

6. Signs That the Water in the Area Is Polluted 

• Discoloration: Brown or murky water, which is a sign of manure-derived suspended particles.

• Foul odor: The pungent, disagreeable smell of organic waste that is breaking down.

• Algal blooms: Excessive nitrogen levels cause an increase in algae growth.

• Fish kills: Unexpected demises of aquatic life brought on by hypoxia, or low oxygen levels. 

7.Transportation, Transformation, Bioaccumulation & Biomagnification

• Transportation: Pollutants reach the river from the farms and are carried by surface runoff, especially during periods of rainfall.

• Transformation: Microbial activity in the water can change certain contaminants, such as ammonia, into nitrites or nitrates.

• Bioaccumulation: Heavy metals or toxic compounds may build up in aquatic organisms' tissues.

• Biomagnification: As these contaminants ascend the food chain, they may concentrate more and impact larger fish and birds, among other predators. 

8. Health Problems Associated with Polluted Water 

• Waterborne diseases: Both humans and animals may get gastrointestinal and other infection as an impact of pathogen contamination.

• Chemical poisoning: Both people and wildlife can be harmed by prolonged exposure to contaminants like ammonia or antibiotics.

• Antibiotic resistance: The emergence of resistant bacteria may be facilitated by the presence of antibiotics in the water. 

9. Chemical Pressure and Ecological Status 

For chemical pressure, the ecosystem of the river is under stress due to the continuous influx of pollutants from the pig farms, such as chemicals and nutrients, which reduces the river's capacity to sustain biodiversity and for the ecological status, the Sungai Rambai river is in poor health, and its biodiversity and ecosystem services, such fish farming and water purification, are probably going to decline. 

10.Risk Assessment 

• Health risk: The pollution poses significant health risks to communities that depend on the river for water sources and fishing.

• Ecological risk: The pollution disrupts aquatic life and can causes long-term damage to the ecosystem's ability to recover.

• Economic risk: A polluted river can negatively impact local industries such as  fishing and agriculture.

11.Removal of Pollutant Properties from the Water Body 

•  Physical method: To eliminate organic matter and suspended materials, sedimentation, filtering, and skimming are used.

• Constructed Wetlands: To filter and absorb pollutants and nutrients, artificial wetlands are built.

• Better waste management: To stop more pollution, pig farms can implement better waste management techniques, like installing wastewater treatment systems, improving manure storage, or utilizing biogas digesters.

1. Water Quality Status Before Pollution Occurs 

Before the pollution crisis happen, Yamuna River had a clearer and healthier water. This water have supported diverse ecosytem including fish and other living things.Natural levels of nutrients like phosphorus and nitrogen would have supported plant life without eutrophication or toxic algal blooms. This river water  also have supported nearby communities by being used for bathing., agriculture and drinking.

2. Pollution Occurrence 

The main causes of the Yamuna River's increasing pollution over time are solid waste, especially plastics, industrial runoff, and waste from untreated sewage. Plastic bottles, wrappers, and other non-biodegradable waste have been piling up in the river in recent years. The awareness to solve this issue are reflected in the trash collection efforts of students. Chemical pollutants from industrial discharges and religious activities, such as the disposal of idols and offerings in the river are one of the problem.

3.Chemical Properties of the Pollutants 

• Toxic chemical: Chemicals from industrial processes that are toxic to aquatic life include pesticides, detergents, and other substances.

• Plastic waste: Non-biodegradable waste, such as plastics, that obstruct water flow and physically harm aquatic life and water quality.

4. Sources of Pollutants 

• Industrial effluents: Toxic chemicals and heavy metals are contributed by factories along the river.

• Solid waste: Trash builds up in the river as a result of poor waste management and the area's high plastic usage. 

5. Pollutant Screening and Detection Methods 

• Water sampling: Taking water samples from different spots along the river to be able to check for pollutants.

• Chemical analysis: Checks for nutrients, heavy metals, and other dangerous substances including pesticides or leftover medication.

• Microbial testing: Assesing untreated sewage for pathogens and dangerous bacteria like E. coli. 

6. Signs That the Water in the Area is Polluted 

• Water that has become murky: High turbidity from suspended solids, frequently brought on by sewage or industrial discharge. 

• Visible trash: Floating plastic waste and other debris are obvious a clear sign of contamination.

7. Transportation, Transformation, Bioaccumulation & Biomagnification 

• Transportation: Water flow, especially during the monsoon season, brings pollutants like plastics, chemicals, and nutrients along the river.

• Transformation: Microorganisms have the ability to change certain pollutants, such as sewage ammonia, into nitrates or other substances.

• Bioaccumulation: Toxic substances including heavy metals build up in aquatic organisms tissues.

• Biomagnification: Process that helps these toxins accumulate in the bodies of larger fish or animals as they go up the food chain, eventually impacting humans that depend on fish for thier life routine.

8. Health Problems Associated with Polluted Water 

• Waterborne conditions: Pathogens like E. coli can cause cholera and typhoid when contaminated water is consumed.

• Skin infections: Rashes and other skin issues can result from extended exposure to polluted water.

• Reproductive problems: Chemicals in the water can cause developmental and fertility problems by interfering with the endocrine systems of humans and aquatic organisms. 

9.Chemical Pressure and Ecological Status 

• Chemical pressure: The ecosystem of the river is being impacted by the constant introduction of pollutants such as plastics, heavy metals, and sewage. It is Due to sensitive species that  cannot survive in the toxic conditions biodiversity is decreased.

• Ecological status: The Yamuna's health has been seriously harmed. The loss of vital habitats, eutrophication, and oxygen depletion make it difficult for the river to maintain its life. Fish and other aquatic life have been decreased as a result of low water quality. 

10. Risk Assessment 

Health risks: Both local communities and wildlife might suffer long-term health problems, chemical toxicity, and several kinds of waterborne diseases as the result of direct exposure to contaminated water.

Environmental risks: Pollution impacts the ecosystem of the river. Overall biodiversity decreases and aquatic species are dying. 

11.Removal of Pollutant Properties from the Water Body

• Waste management: Making improvements to the way solid waste and sewage are collected and treated to keep them out of the river.

• Industrial regulation: Ensuring factories along the river adopt proper waste disposal practices and treatment technologies to reduce chemical discharge.

• Public awareness: Educating the public and involving communities in cleanup efforts, like the students collecting trash to reduce plastic pollution and littering. 

1.Water Quality Status Before the Pollution Occurs 

Before having pollution, Sungai Ngulang probably had a reasonably healthy ecosystem prior to the pollution incident, supporting local aquatic life. With clear water, balanced dissolved oxygen and nutrient levels, and few pollutants, its water quality was probably good. The river would have been appropriate for community uses like fishing and leisure activities, as well as for the local biodiversity. 

2. Pollution Occurrence

The pollution in Sungai Ngulang occurred when a nearby factory’s activities resulted in the discharge of harmful substances into the river. Local authorities issued a stop-work order after it was determined that the factory was to blame for the water contamination. This implies that industrial waste that was either untreated or insufficiently treated was discharged into the river, harming the ecosystem. 

3. Chemical Properties of the Pollutants 

• Heavy metals: Industrial effluents can contain toxic metals like lead, mercury, or cadmium, which are harmful to aquatic organisms.

• Nutrient overload: High levels of nitrogen and phosphorus from industrial discharges may lead to eutrophication, which disrupts the aquatic ecosystem.

• Organic compounds: Chemicals used in manufacturing processes may enter the water, leading to oxygen depletion and affecting aquatic life.

4. Sources of Pollutants

The source of the pollutants in Sungai Ngulang is the factory, which was in charge of releasing waste into the river that had either not been treated or had been treated incorrectly. The main sources of contamination were found to be chemical runoff, industrial effluents, and potentially waste products from manufacturing processes. 

5. Pollutant Screening and Detection Methods

• Chemical analysis: examining for particular contaminants like organic compounds and heavy metals.

• The biological oxygen demand (BOD) : Used to quantify the effluent's capacity to deplete oxygen.

• Tests for dissolved oxygen, turbidity and pH: common ways to determine the degree of pollution in water and evaluate its general quality. 

6. Signs That the Water in the Area is Polluted

Algae blooms: Excessive nutrient pollution can lead to harmful algae growth, causing the water to appear green or murky. 

Turbidity: Cloudiness or discoloration of the water, which is often a result of suspended solids from industrial discharge.

Fish kills: A hint of oxygen depletion resulted by chemicals and organic waste in the water. 

7. Transportation, Transformation, Bioaccumulation & Biomagnification

• Transportation: The water current carries pollutants from the factory downstream, where they have an impact on larger stretches of the river.

• Transformation: Certain pollutants may change into new, potentially dangerous compounds through processes like chemical breakdown or microbial digestion.

• Bioaccumulation: Over time, pollutants such as heavy metals may build up in aquatic organisms' tissues.

• Biomagnification : The process  which contaminants accumulate in larger organisms such as fish or birds as they go up the food chain. This can result in toxic levels in predators, such as humans, who eat contaminated fish. 

8. Health Problems Associated with Polluted Water

• Waterborne illnesses: Conditions such as cholera and typhoid can be brought on by the presence of dangerous bacteria or pathogens.

• Chemical poisoning: Prolonged exposure to heavy metals, such as lead or mercury, can harm the nervous system, kidneys, or reproductive system.

• Skin and eye irritation: Coming into contact with contaminated water, especially when chemicals or contaminants like pesticides are present, can result in rashes or infections.

• Long-term health hazards: The risk of developing cancer or reproductive problems can be raised by exposure to pollutants such as carcinogens or endocrine-disrupting chemicals. 

9. Chemical Pressure and Ecological Status

• Decreased biodiversity as harmful pollutants affect aquatic life.

• Disruption of food chains, with organisms at higher trophic levels impacted by biomagnification.

• Interference with the river’s natural processes, including nutrient cycling and oxygen replenishment.

10. Risk Assessment

• Health risks: The polluted water poses a direct health threat to people who rely on the river for drinking, bathing or irrigation.

• Environmental risks: The contamination threatens aquatic life, potentially leading to a collapse of the rivers ecosystem, affecting fish populations and other species that depend on the river. 

11. Removal of Pollutants Properties from the Water Body

• Physical methods: Sedimentation and filtration can help remove suspended solids and larger contaminants.

• Technologies for pollution control: To filter out pollutants, create wetlands or buffer zones. You can also use bioremediation, which uses microorganisms to break down pollutants. 

1.Water Quality Status Before Pollution Occurs 

Before the pollution happen,the Sài Gòn-Đồng Nai River probably had reasonably clean water prior to urbanization and industrialization, supporting aquatic life and supplying drinking water for the local communities. Clear water, a steady flow of nutrients, and a robust ecosystem would have all been part of the river's natural equilibrium. Fish and other aquatic life would have been prevalent, and water quality monitoring would have shown low levels of contaminants and good chemical characteristics. 

2.Pollution Occurrence 

Urbanization, industrialization, and the growth of residential areas along the riverbanks have all contributed to the Sài Gòn-Đồng Nai River's increased pollution. Large volumes of untreated wastewater are now dumped into the river from a variety of sources, such as homes, factories, industrial parks, and export processing areas. Rainwater is another factor in the runoff that makes the pollution issue getting worse. 

3.Chemical Properties of the Pollutants

•  Organic pollutants: These are mostly found in household wastewater and include soap residues, food waste, and sewage.

• Toxic substances: Pesticides, solvents, and petroleum-based products are among the toxic substances that can be found in factory chemical waste. 

• Pathogens: Bacteria and viruses from untreated sewage.

4. Sources of Pollutants 

• Residential areas: Garbage, sewage, and household waste all flow straight into the river or its tributaries.

• Manufacturing and industrial facilities: Untreated or inadequately treated wastewater may goes into rivers by factories, especially those located in industrial parks and export zones.

• Runoff from agriculture: When it rains, fertilizer and pesticides from nearby farms may flow into the river. 

5.Pollutant Screening and Detection Methods 

• Water sampling and analysis: To detect specific pollutants such as heavy metals and organic compounds.

• Biological oxygen demand (BOD): To measure oxygen-depleting potential from pollutants.

• Physical tests: Including turbidity, pH, and dissolved oxygen to assess water quality.

6.Signs That the Water in the Area is Polluted 

• Bad odors: The presence of sewage or decaying organic material causes foul smells. 

• Foam: Excessive foam on the water surface can indicate detergents or industrial waste 

• Turbid water: Cloudiness or discoloration due to suspended solids.

7. Transportation, Transformation, Bioaccumulation & Biomagnification 

• Transportation: Water flow, particularly during rainy seasons, carries pollutants downstream. The contaminants have the ability to disperse over wide regions, lowering the quality of the water there.

• Transformation: In the environment, certain pollutants may change chemically or biologically. For instance, organic waste may break down into hazardous chemicals or heavy metals may be transformed into more toxic forms.

• Bioaccumulation: When aquatic organisms ingest contaminated water or prey, pollutants, particularly heavy metals and toxic chemicals, build up in their tissues.

• Biomagnification: The concentration of pollutants rises as higher-ranking predators eat tainted prey, which can have detrimental effects on the environment and human health. 

8.Health Problems Associated with Polluted Water 

• Skin conditions: Rashes, skin irritations, and other dermatological problems can be brought on by exposure to harmful chemicals and pollutants.

• Cancer: Long-term exposure to some chemicals, such as those that cause cancer and are present in industrial waste, can raise the risk of developing cancer.

• Reproductive problems: Both humans and wildlife may experience reproductive health problems as a result of endocrine-disrupting chemicals found in contaminated water. 

9.Chemical Pressure and Ecological Status 

The degree of stress that pollutants place on the aquatic ecosystem is referred to as chemical pressure. Poor ecological conditions are caused by high chemical pressure in the Sài Gòn-Đồng Nai River, which is evident from the toxic substances entering the water. Because of the pollution, many species are either unable to survive or are being forced out of the river and harming its biodiversity. Algal blooms brought on by eutrophication further deteriorate water quality by creating hypoxic (low oxygen) conditions that are detrimental to aquatic life. 

10.Risk Assessment 

• Assessing health and environmental risks associated with the contamination.

• Evaluating exposure levels for humans and wildlife.

• Identifying specific pollutants happen in the river.

11. Removal of Pollutants Properties from the Water Body 

• Biological treatment: Microorganisms are used to degrade organic pollutants and remove nutrients like nitrogen and phosphorus.

•  Chemical treatment: Chemicals such as flocculants are used to bind with pollutants and make them easier to remove from the water. 

• Physical methods: By sedimentation, filtration, and aeration techniques can remove solid pollutants and improve water quality.