Presentation For Water Treatment (2).pptx

Waste Water treatment through ASP method.

1. INTRODUCTION TO WASTE WATER & SLUDGE TREATMENT METHODS 1

2. INTRODUCTION TO OUR COMPANY Infra is basically into infrastructure company based in. We provide EPC services in different sectors viz. Water Sector, Construction sector etc. We have successfully erected and commissioned various government projects. We have a sound experience to work with various Central as well as State government bodies. We have successfully installed and commissioned various STP plants in Gujarat, Maharashtra, Madhya Pradesh etc. 2

3. Primary treatment – Reduces the suspended solids and the BOD of the wastewater. Secondary treatment – The stream from Primary treatment is further treated to reduce other suspended impurities, Organic matter etc. from the wastewater. Sludge treatment – The sludge generated from primary and secondary treatment process is pumped to the sludge thickener. More settling occurs to concentrate the sludge prior to disposal. METHODS FOR WASTE WATER TREATMENT & SLUDGE TREATMENT 3

4. ACTIVATED SLUDGE PROCESS 4 The basic Activated Sludge Process consists of – A reactor in which the microorganisms responsible for treatment are kept in suspension and aerated. Liquids-Solids separation, usually sedimentation tank. A recycle system for returning solids removed from the liquids-solids separation unit back to the reactor. Important feature of activated sludge process is formation of flocculent settleable solids that can be removed by gravity settling . Activated Sludge process utilizes – Fluidized microorganisms Mixed growth microorganisms Aerobic conditions Oxygen Supply

5. Benefits of Activated Sludge Treatment: The quantity of unwanted sludge is reduced. Beneficial bacteria reseed themselves in sewage treatment plants. The activated sludge treatment process allows for longer emptying intervals. The procedure is extremely dependable and less complicated. Process is odorless. 5 ACTIVATED SLUDGE PROCESS

6. 6 From activated sludge treatment the water flows to the final clarifiers for further removal of sludge. The final clarifiers are another set of sedimentation tanks. From the final clarifiers the water is discharged back to the river. The final clarifiers remove additional sludge. ACTIVATED SLUDGE PROCESS

7. 7 Introduction: The residue that accumulates in sewage treatment plants is called sludge (or bio-solids). In the past, the disposal of the sludge done by landfill or incineration. Landfill disposal discontinued to the threat of leachate. Incineration discontinued because of the ineffectiveness and cost. Sludge Treatment Factors: Treatment and disposal of sewage sludge are major factors in the design and operation of all wastewater treatment plants. Two basic goals of treating sludge before final disposal are to reduce its volume and to stabilize the organic materials. Stabilized sludge does not have an offensive odour and can be handled without causing a nuisance or health hazard. Smaller sludge volume reduces the costs of pumping and storage. SLUDGE TREATMENT PROCESS

8. 8 Sludge is a byproduct of wastewater that may be in solid, semisolid or slurry form. This substance is divided into two main classifications — primary and secondary. Primary sludge comes from the primary sedimentation treatment of wastewater, while secondary sludge is the activated waste that results from biological treatments . Sludge is essentially a waste product, there is increasing focus on its potential as a resource, specifically with reference to; Latent Energy (Calorific value content, which can be used to quantify its potential for methane gas formation and/or hydrogen gas production). Nutrient content (Phosphate & Nitrate) Sludge Treatment Methods Used: Thickening - Usually the first step in the sludge treatment process, this is where primary or secondary sludge gets stirred with clarifying agents to create larger, solid aggregates. Digestion - The digestion process involves reducing the amount of microorganisms and organic matter in solid sludges. This process is further classified into three methods — aerobic digestion, anaerobic digestion and composting. Dewatering - Dewatering is reducing water content in sludge through centrifugation, filtration or evaporation. Sludge with 50% to 75% water is handled as a solid material, while sludge with more water undergoes further treatment Disposal - As the final step of sludge management in water treatment, this is where the dewatered sludge gets transported to designated disposal sites. Landfills, where sludge is usually buried underground, are the most common sites for disposal. Other sludge disposal methods include reclamation, incineration and land application. SLUDGE TREATMENT PROCESS

9. Typical Flow Diagram for Waste Water Treatment along with Sludge Treatment 9

10. SLUDGE THICKENING PROCESS 10

11. 11 ANAEROBIC DIGESTION PROCESS

12. 12 The Sludge treatment process is even used as part of Ganga Action plan project phase. The project includes process using microorganisms to break down the effective organic matter in the sewage, hence making it a good way to treat the waste water. Also, the sludge produced during the treatment of sewage wastewater, can be converted into useful products like fertilizers and bio-fuels. This initiative aims to monetize and reuse the treated wastewater and sludge. Wastewater treatment is necessary to remove pollutants from the wastewater and prevent the contamination of natural resources. It also makes treated sludge viable for other uses, such as fertilizer for gardens and parks, soil erosion control, landscaping, heating and cooking, and generating energy in the form of alternative fuels. SLUDGE TREATMENT PROCESS