Would a heavy rainfall effect the STP efficiency?
The wastewater industry is critical to public health and environmental protection.
Hundreds of Government entities are in charge of collecting, treating, and disposing of water that has been contaminated by human activities, as well as maintaining a massive network of pipes and plants to collect, treat, and dispose of this water.
Wastewater that has been treated serves as a source of recycled water. Local water supply agencies are looking to enhance resilience and diversify their supplies, which is driving the rising demand for recycled water. Furthermore, the industry has had to adjust to a constantly changing set of laws and regulations aimed at protecting human and environmental health.
Even as the quantity and quality of the water they treat falls, wastewater agencies are entrusted with reliably eliminating pollutants from water discarded to sewers. Drought is the most significant of the numerous climate stressors that are likely to affect wastewater management.
Rainfall's impact on sewage treatment facilities
Stormwater can enter the wastewater collection system through sewage manholes, ground infiltration, defective connections, and leaky or damaged pipes during heavy rain or other wet weather occurrences.
Increases in stormwater intake to the collecting systems can increase the flow rate to the WWTP, potentially exceeding the treatment capacity designed for a WWTP.If high flow rates surpass the treatment facility's design capacity, the facility's performance may be harmed. The extent to which stormwater affects WWTP discharges is determined by the storm's severity and length, the type of sewer collection system used, and the treatment facility's characteristics.
At a full-scale activated sludge wastewater treatment facility with a process solution incorporating pre-denitrification in activated sludge and post-nitrification in trickling filters, rain events have a stronger impact on effluent quality dynamics. Because of the combined sewer system, the incoming wastewater flow varies greatly. Because the recirculation to the trickling filters is limited by the hydraulic restrictions of the secondary settlers, changes in flow conditions have an impact on the entire treatment process.
Due to significant rains, more than 80% of agencies report reduced flows to their wastewater treatment plants. The majority of people also see reductions of 10 to 25%. Increases in biological oxygen demand (BOD), nutrient concentrations, ammonia loading, total suspended solids (TSS), particles, and salinity (TDS) in wastewater influent are also observed.
Change of effluent quality!
Increased flow due to rain or snowmelt changes the characteristics of the entering wastewater, affecting process performance and effluent quality, particularly particle removal efficiency.
Conclusion
According to the latest data from the Central Pollution Control Board, sewage treatment plants (STPs) in India can process a little more than a third of the sewage generated every day. India produced 72,368 MLD (million litres per day), while STPs had a capacity of 31,841 MLD (43.9 percent).
The reuse of treated sewage is a topic that hasn't received much attention in many state governments' policy planning. The Delhi government has set a goal of increasing reuse to 60% from 12.5 percent.
Water demand from aquatic sources such as rivers, ponds, lakes, and groundwater sources can be reduced by reusing treated sewage.The effluent of the sewage treatment plant is harmed by excessive rains, which must be avoided.
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