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IRJET- A Case Study and Design Approach for Sewage Treatment Plant in Kakumanu Village
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 10 | Oct 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 968 A CASE STUDY AND DESIGN APPROACH FOR SEWAGE TREATMENT PLANT IN KAKUMANU VILLAGE. VINAY NANNAPANENI1 1M.S. Riga Technical University, Latvia ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - Many villages in the developing countries are facing problems on ground water and surface water. Kakumanu Village located in Guntur district of an Indian state Andhra Pradesh. Due to steady increase of population in the village, the generation of domestic sewage also increase and still there is no sewage treatment plant. So, the construction of sewage treatment is required with enough capacity. Wastewater treatment plant has many challenges for treating of excess sludge and its disposal. Several methods involved to reduce its water and organic content and finally to protect the environment. This paper focal point is generation of sewage and design of Wastewater treatment plant in both Kakumanu. One day the generated sewage was estimated 0.739 MLD for the next 30-year projected population. Sewage treatment plant consists of three process are Preliminary treatment, primary treatment and secondary treatment. Screening, gritchamber, primarysedimentation tank, biological reactor, secondary clarifier, activated sludge tank, drying bedsarethemaincomponentsinwastewatertreatment plant. Components are designed by considering the various standards and permissible limits oftreatingsewagewater. Ultimately, treated sewage water is supplied to irrigation and the generated sludge can be used as manure helps in increase of soil fertility. Key Words: Wastewater treatment plant, Design approach, Sludge, Population, Grit chamber, Aeration tank. 1. INTRODUCTION This paper deals with design of wastewater treatment plant for Kakumanu village. The village Kakumanu is located at16.3: North and 80.23: East altitudes in Guntur district. Over the years, with increasing population, industries and agriculture the demand for water also pushed up. Many efforts have done for water storage in the form ofdamsandreservoirs.The demandof water for agricultural, industrial and domestic activities are increased. Not only surface water resources but groundwater resources also resulting below the riverbed. Due to the low availability of water with increasing growth of population the serious water scarcity problems were increased. To minimize these problems the sewage treatment plant is to beconstructed for treating of wastewater. Sewage treatment plant consists of three process are Preliminary treatment, primary treatment and secondary treatment shown in Figure 1.[6] Preliminary treatment consists of separating like floating materials like papers, wood, rags, nappies, facewipes, bottle tops, broken bottles, diapers, plastics, cotton buds, sanitary items etc. are removed. Primary treatment consists of removing large suspended organic solid materials which are usually settled in the process of sedimentation. In the secondary treatment process, seed sludge is added to wastewater and the air is pumped into huge aeration tanks which helps to mix the seed sludge with wastewater. And the large particles will settle down and wastewater passes through the large tanks. Figure 1: Screenshot of Function Decomposition.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 10 | Oct 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 969 2. Population Forecast As per 2011 census, the population of kakumanu village is 5,777[4]. If the rateofpopulationisincreasedas50peryear, then the estimated population for 30 years is P2050 =5777+(8*20) +(30*20) = 6537 Therefore, the estimated population of Kakumanu village is 6540 (assumed). Quantity of water supply per person = 150LPCD. Rate of water supply, WC = 870,750 LPCD or 870 KLD or 0.87 MLD or 870 m3/day. As per CPHEEO guideline, the generated sewage will be 80-85% Sewage generated = *0.87 MLD = 0.739 MLD or 739 KLD Therefore, the quantity of sewage water generated is 0.739 MLD. Average Sewage per hour= m3/hr Peak flow rate of sewage is 3 for population less than 20,000. Design Flow capacity= 3* 30.79 = 92.37 m3/hr = 0.0256 m3/sec. 3. Design Considerations The points to be considered during design of sewage treatment plant are: Design period is taken as 30 years. The design is done on average domestic basis. Self-cleaning velocity is to develop at every place and stage. Design of treatment should be economical and easily to maintain. 4. Design of Collection pit Storage tank, a container used to store the liquids also known for artificial lakes and ponds. It can be available in different shape: vertical and horizontal cylinder, open top and closed top, flat bottom, cone bottom and slope bottom. Retention time = 4hr. Average design flow= 30.79 m3/hr Capacity of collection sump = 4*30.79= 123.16 m3. Assumed liquid depth = 5m. Area required for collection pit, A = = 24.63 m2. The shape of the storage tank is taken as circular here.
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 10 | Oct 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 970 Now, r = (where A=∏r2 ) r = 2.8 m. Design of sewer chamber Qmax = 0.0256 m3/sec Assumptions; Shape of bar= M.S. Flats Size+ 10mm*50mm Clear spacing between the bars= 20mm Inclination of bars = 80: Assume average velocity of sewer= 0.8 m/sec At peak flow, required net inclined area = 0.03 Gross inclined area = (9/0.8) *1.5 =0.072 sq.m. Gross vertical area required = 0.072* sin 80 = 0.070 sq.m. Provide submergence depth = 0.3 m Width of channel = 0.070/0.3 = 0.23 m. Therefore, provide 20 bars of 10mm *50mm. 5. Design of grit chamber The flow from screen channels is taken into grit chamber, provided with 2 duplicate C.I gates one at inlet and other at outlet. Design Flow = (2.5 * 0.739)/2 = 0.923 MLD or 923 m3/day Surface loading = 1100 m3/sq. m/day To account the turbulence and short circuiting, the surface loading is reduced to 800 m3/ sq. m/day. Therefore, required area = 923/800 = 1.15 sq. m. Provide 1.15m dia. Chamber i.e. circular Detention time = 60 sec. Volume, V= (923* 60)/(24*60*60) = 0.64 m3 liquid depth= Volume/ Area = 0.64/1.15 = 0.556m. free board = 0.6 size of grit chamber = 1.7*(0.556+0.6) = 1.7* 1.156 (dia* depth)
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 10 | Oct 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 971 Check for horizontal velocity Cross sectional area of grit chamber = 1.7*0.556 = 0.945 sq.m. Velocity = 923/(1.7*0.556*24*60*60) = 0.011m/sec.= 1.1 cm/sec< 18 cm/sec. Hence OK. Assumed Grit generation = 0.05 m3 per 1000 m3 of sewage flow. Required storage volume = (739*8*0.05) / (24*1000) = 0.012 m3 Grit storage area = ( )*1.72 = 2.27 m2. Grit storage depth = 0.012/2.27 = 0.0052 m. Total liquid depth = 0.556+0.005 = 0.561 = 0.6 m. Provided size of grit chamber = 1.7*(0.6+0.6) = 1.7m * 1.2m. 6. Design of primary sedimentation tank Detention time = 2 hr. Volume of sewage = max quantity of sewage / (detention time*24) = 739/(2*24) = 15.39 m3 Provided depth = 2m. Surface area = volume/depth = 15.39/2 = 7.695 sq. m. D = (where A = )* d2 = 3.12 m. 7. Design of Aeration tank No of tanks = 2 Average flow in each tank = 0.739 MLD/2 = 0.369 MLD Q = 369 m3/day Total BOD entering STP= 295 mg/L The BOD of sewage coming to aeration tank YO= 295 mg/L BOD left in effluent = YE= 20 mg/L BOD removed in activated plant = 295 - 20 = 275 mg/L Required minimum efficiency in activated plant = 275/295 = 0.93=93% Volume of aeration tank can be designed by assuming a suitable value of MLSS and θ or F/M ratio = 3000 mg/L F/M ratio = 0.15 F/M =Q/V= YO/XT 0.15 = (369*295)/(V * 3500) V= (369* 295)/(3000*0.12) V= 302.3 m3
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 10 | Oct 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 972 7.1. Aeration tank dimensions Let us adopt a depth of 3.5m and width 9m aeration tank. Length of tank = V/(B * D) = 302.3/(9*3.5) = 9.59 m = 10m. Therefore, provided volume= 10*9*3.5=315 m3 Check for aeration period t = (V/Q) *24hr = (315/369) *24= 20.48 = 20 hrs Check for volumetric loading = Q*(YO/V) gm of BOD 5/m3 volume of tank. = (369* 295)/315 gm/m3 = 345.57 gm/m3 = 0.34 kg/m3 Check for return sludge ratio QR/Q = XT/((106/SVI)- XT) SVI should be between 50 m/gm – 150 m/gm. Using 120 m/gm QR/Q = 3000/((106/120)-3000) = 0.56 (between 0.5 - 1) Check for SRT V*XT = [αy*Q(YO-YE) θc]/ (KE* θc+1) Where, αy=1, KE= 0.06/d, 315*3000 = [1*369(295-20) θc]/(0.06 θc+1) 945000= 101475 θc/ (1+0.06 θc) 1+0.06 θc = 0.107 θc θc= 1/0.047 θc = 21.27 days. Adopted size of aeratin tank is 19m*9m*(3.5+0.6) m. 8. Design of Secondary clarifiers Average sewage flow = 739 KLD = 739 m3/day Recirculated flow = 461 m3/day (assume 50%) Total inflow = 739+ 461= 1200 m3/day Detention time= 2hrs Volume of tank = 1200*(2/24) = 100 m3 Liquid depth =3.5m (assumed) Area = 100/3.5 = 28.57 m2 Average flow of surface loading = 15 m/day
6.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 10 | Oct 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 973 Surface area to be provided = 739/15 = 49.26 m2 = 50 m2 Diameter of circular tank, d= = 7.97m = 8m. Check for weir loading Average sewage flow = 739 KLD = 739 m3/day Weir loading = 739/ (∏*8) = 29.40 m3/day/m. (< 185 m3/day/m) Check for solids loading Recirculated flow = 461 m3/day Average sewage flow = 739 KLD = 739 m3/day MLSS solids inflow = 3000 mg/L Total solids inflow = (739+461) *3 = 3600 kg/day. Solids loading = 3600/50 = 72 kg/day/m2. Provide a clarifier with 8m dia and depth 3.5m. Hopper slope = 1 in 12 9. Return sludge pump house Total return flow = 461 m3/day = 19.20 m3/hr = 0.32 m3/ min. Detention time = 15 min Volume of wet well = 0.32*15 wet well provided = 2.5m*1.5*1.8m dry well provided = 2.5m*2.5m control room size = 2.5m* 2.5m Provide 2 pumps with capacity 0.461 MLD and diameter of return sludge pipe should be 150mm. 10. Design of Sludge drying beds Sludge applied for drying beds@ 100 kg/MLD Sludge applied per day =125kg Specific gravity, g=1.015 Percentage of solid contents = 1.5 volume of sludge = (125/ 1.5%) *(1/(1000*1.015)) = 8.2 m3/day. Total number of cycles in one year =33 Therefore, period of each cycle = 365/33 = 11 days Volume of sludge = 8.2 * 11 = 90.2 m3 Area of beds required for 0.3m/cycle spreading layer = 90.2/0.3 = 300.67 Provide 4 beds with dimensions 1.2m * 7m and hence the area provided is 336 m2 11. Filter Pumphouse and sump Excess sludge water, θc = V*(XT/QW*XR) 21.27d = (315*3000)/(QW*XR)
7.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 10 | Oct 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 974 QW*XR = 44428.77gm/d = 44.4kg/d Assume excess sludge contains 1% solids and specific gravity = 1.015 Volume of excess sludge = 44.4/(1000* 1.015* 1%) = 4.37 m3/ day = 0.18 m3/ hr. Detention time = 8 hrs Volume of wet well = 8 * 0.18 = 1.44 m3 for 1% concentration Liquid depth provided = 1m Therefore, the area required for 1% concentration of solids = 1.44/1 = 1.44 m2 Diameter of wet well = = 1.35m Assume 2m diameter. 12. CONCLUSION Due to increase in population in Kakumanu village, looking on future aspect, it is quite necessary to construct wastewater treatmennt plant. In the present study, wastewater treatment plant in Kakumanu is analysed and designed perfectly to meet needs and demand for population 6540 for 30 years. The utilization of treated water will reduce the use of fresh water and ground water. Treated sludge can be used for manure helps to increase fertility in soil. The construction of wastewater treatment plant helps to prevent direct disposal of sewage into fields and reduce the freshwater consumption. REFERENCES 1. Aswathy. M and Hemapriya (2017), Analysis and DesignofSewageTreatmentPlantof ApartmentsinChennai,Volume116 157-163p 2. Aswathy. M and Harini T. (2017) Design of Wastewater Treatment Plant for Tambaram municipality, Volume11677-83p 3. Census of India, C. villages & Towns in Kakumanu mandal Guntur, Andhrapradesh- Census 2011. [Retrived on 1st October 2019]. 4. Directorate of Census operations, (2011) District Census Handbook, Guntur [Part B]. 5. George, T. at. al. Wastewater engineering- treatment and Reuse [Fourth Edition]. 6. Janaki Vallakeerthi and Aenumula Mallikarjun. (2018) A Design Approach for Sewage Treatment Plant: A case study of Guntur Greater Muncipality, Andhra Pradesh, India. Volume-5. 7. Ministry of Urban Development, M. New Delhi (1993, December), Manual on Sewerage and sewage Treatment, Second Edition (accessed on 1 October 2019). 8. Nhapi I. and Huub J (2005) A 3 step strategic approach to sustainable wastewater management. 9. Ravi kumar, P. at. al. (2010, November) Assessment of the Efficiency of Sewage Treatment Plants: A comparative study between Nagasandra and Mailasandra sewage treatment plants. Volume-6. BIOGRAPHIES Vinay Nannapaneni received master’s degree in Civil Construction and Real Estate Management, Latvia, Europe in 2019. Done Bachelor’s degree in Civil Engineering from R.V. R & J.C. College of Engineering, Guntur, Andhra Pradesh, India. hoto
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