MLD at Noida) was investigated twice in year 2010 and for remaining 3 STPs (48, 100 and 152 MLD at Ludhiana), the overall performance was monitored three times consecutively throughout the year 2010.Analytical procedureMaterials and methodsDescription of STPs and monitoring planAll STPs monitored within this study adopted the sequence of units as screensgrit chambersUASB reactors followed by one of many four post remedy: Final Polishing Unit (FPU) or polishing ponds (PP), and/ or other aerobic post treatment systems (Figure 1). The sludge drying beds, gas holder and dual fuel generators have been typical at all STPs beside 1 gas engine at a STP. The influent flow prices varied from 38 to 152 MLD (million litres every day). The distinctive STPs configuration and operational circumstances were summarized in Table 1. The performanceGrab samples had been collected from inlet chamber for sewage, UASB effluent at outlet pit, and final effluent from post therapy systems like polishing ponds (PP) or ASP and so forth. Samples have been collected in one particular litre plastic bottles and kept in an air tight ice box and transported towards the Environmental Engineering Laboratory, Division of Civil Engineering, IIT Roorkee, India. Analysis of all physicochemical parameters and heavy metals have been produced following the normal methods [11]. The samples for heavy metals analysis had been collected in to the 500 mL plastic bottles, which were acidified with two mL HNO3, to be able to stay away from the adsorption of heavy metals onto the wall of sample container.Outcomes and discussionSewage characteristicsThe traits of sewage investigated at distinct STPs are presented in Further file 1: Figure S1S4. The dataGAS HOLDER SCREENING GRIT CHAMBER CHAMBER FLOW MEASUREMENT DEVICE (PROPORTIONAL WEIR) FEEDER GLSS c BOXEFFLUENT GUTTERSGRITd DFG ROOMUASB EFFLUENTSLUDGE OUTLETSFINAL DISCHARGE TO SUTLAJ RIVERP SEWAGE a MPS SumpPUMPS AT MPSb UASB REACTORAERATION TANKFPUSLUDGE DRYING BEDS a b c d MPS Most important Pumping Station UASB Upflow Anaerobic Sludge Blanket GLSS Gas Liquid Separator Technique DFG Duel Fuel GeneratorFigure 1 Schematic of STP procedure flow diagram (111 MLD Ludhiana).Price of 844501-00-4 Khan et al.2′-O-MOE-U Purity Journal of Environmental Wellness Science Engineering 2014, 12:43 http://www.ijehse.com/content/12/1/Page 3 ofTable 1 Design parameters of STPs (UASBPost treatment system)STPs Saharanpur Agra Capacity (MLD) 38 78 L B D/H (m) 24286.PMID:24318587 10 2440 five.25 UASB No. of reactors four six HRT (h) 9.4 9.three Vol. (m3) 15000 30200 L B D/H (m) 12700 m2 1.5 m (PP) 214 93 1.six (PP) 130 160 1.6 (PP) 123 163 1.60 (PP) Karnal Vadodara Surat Noida Noida Ludhiana 40 43 one hundred 27 34 111 32 24 4.8 24224.80 20 20 7.44 24 28 six.10 24 24 six.25 32 30 5.1 4 six 20 three four 9 eight.five 7.2 8.five 9.9 9.six 9.0 14100 14680 39200 11200 13600 44064 241 135 1.25 (PP) 52 26 four.0 (ASP) 60 16 5.five (ASP) 110 120 1.6 (PP) 237.four 55.1 1.3 (PP) 24 12 three.five (Aeration) 602 270 1.five (PP) Ludhiana Ludhiana 152 48 32 38 5.10 32 30 5.10 12 four 11 9.5 73836 9.517002 602 270 1.five (PP) 602 270 1.five (PP) Post therapy program No. of reactors two 1 1 1 1 2 four two 20 1 1 1 2 HRT 1.0 d 1.2 d 1.2 d 1.2 d 1.0 d 6h 3h 1.6 d 1.0 d ten min 1.89 d 1.60 d two.five d 40700 10816 21120 42000 38000 1008 43810 43810 43810 Vol. (m3) 38000PP Polishing Ponds, ASP Activated Sludge Process.shows a substantial variation in sewage strength. High BOD and COD concentrations had been determined at five STPs (100 MLDSurat, 27 34 MLDNoida and 111 152 MLDLudhiana) having said that; only the COD concentration at 43 and 48 MLD STPs at Vadodara and Ludhiana was higher (Further fi.
