har ▁State ▁in ▁ 1 9 7 0 ▁. And ▁have ▁ 5 0 , 0 0 0 ▁volunte ers ▁In nov ations ▁include ▁a ▁sc av eng ing - free ▁two - pit ▁pour flush ▁to ile t ▁( S ul ab h ▁Sh auch al aya ); ▁safe ▁and ▁h yg ien ic ▁on - site ▁human ▁waste ▁dispos al ▁technology ; ▁a ▁new ▁concept ▁of ▁maintenance ▁and ▁construction ▁of ▁pay - & - use ▁public ▁to ile ts , ▁popular ly ▁known ▁as ▁Sul ab h ▁Comple xes ▁with ▁bath , ▁la und ry ▁and ▁ur inal ▁facilities ▁being ▁used ▁by ▁about ▁ten ▁million ▁people ▁every ▁day ▁and ▁generates ▁bio - gas ▁and ▁bio fer til izer ▁produced ▁from ▁ex cre ta - based ▁plants , ▁low ▁maintenance ▁waste ▁water ▁treatment ▁plants ▁of ▁medium ▁capacity ▁for ▁institutions ▁and ▁indust ries . ▁Other ▁work ▁includes ▁setting ▁up ▁English - medium ▁public ▁school ▁in ▁New ▁Del hi ▁and ▁also ▁a ▁network ▁of ▁cent res ▁all ▁over ▁the ▁country ▁to ▁train ▁boys ▁and ▁girls ▁from ▁poor ▁families , ▁spe cially ▁sc av engers , ▁so ▁that ▁they ▁can ▁comp ete ▁in ▁open ▁job ▁market . ▁ ▁Institution ▁ ▁The ▁United ▁Nations ▁Centre ▁for ▁Human ▁S ett lement s ▁has ▁pra ised ▁Sul ab h ' s ▁san itation ▁system ▁as ▁a ▁global ▁" U r ban ▁Best ▁Pract ice " ▁at ▁the ▁Hab itat - II ▁conference ▁held ▁at ▁Ist an bul , ▁Turkey , ▁in ▁June ▁ 1 9 9 6 .