annexures - Indian Institute of Technology Roorkee

Guidelines for preparation of reports Under NRCP / NGRBA4.13 SEWAGE TREATMENT PLANTS4.13.1 TechnologyIn the NRCD document “Compendium of Sewage Treatment Technologies” published in 2009,(http://moef.nic.in/modules/recent-initiatives/NGRBA/Final%20Compendium.pdf)technologies have been evaluated on basis ofi. Performance,ii. Energy requirement,iii. Resource requirements and associated costs,iv. Land requirements.v. Annualised cost has also been worked out.This compendium may also be referred for selection of an appropriate sewage treatmenttechnology. It implies that depending on the desired water quality of the effluent of the STP,land requirement, availability of electricity and funds available, the technology that appearsfeasible should be selected using the matrix given in Compendium of Technologies. Newtechnologies like 'In Situ Sewage Treatment through Bioremediation' not covered in thecompendium may also be examined.4.13.2 Options for locating STPs(i)(ii)The following options have to be generally considered for locating STPs:(a) One, with a decentralised approach, which would envisage collection, treatment anddisposal of wastewater in the neighborhood itself.(b) The second option involves conveying the collected wastewater to a centralised STPfrom where it could be suitably disposed of into the river or used for irrigation.(c) Locating the STP further away where land at lower rates is available and inexpensivetechnology can be adoptedAll options have to be analysed in the right perspective taking into consideration capitaland recurring costs and views of stakeholders. Proper justification should be presented inthe DPR for the selected option.4.14 WORKING OUT LAND REQUIREMENTSewers are laid on the road side on publicly owned land. Hence no land is required to beacquired for sewers. However, land is required for Intermediate Pumping Stations and SewageTreatment Plants. In the above referred Compendium, the land required for treatment plantshas been given. It should be used to estimate the land required for STPs. For new technologiesnot covered in the compendium, estimate for the land required may be based on STPs actuallyconstructed. Land required for IPS should also be worked out.4.15 RESOURCE RECOVERYWater is scarce. To the extent possible after use it should be reused or recycled to the extent it isfeasible. If it is not feasible other methods of resource recovery arei. Sale of sludge as manureii. Sale of treated water for irrigation, horticulture39