( ORGANIC ( ( ( WASTES ( ( ( ( ( ( ( ( Domestic ( sewage ( treatment plants ) ) ) , ) ( food ( processing plants ) ) ) , ) ( paper ( mill plants ) ) ) , ) and ) leather ) ) ( tanning ( factories ( ( ( ( release ( organic wastes ) ) ( that ( ( bacterial populations ) increase ) ) ) and ) ( ( use up ) ( ( the oxygen ) ( in ( the water ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP ORGANIC)) (VP (VBZ WASTES) (NP (NP (JJ Domestic) (NN sewage) (NN treatment) (NNS plants)) (, ,) (NP (NN food) (NN processing) (NNS plants)) (, ,) (NP (NN paper) (NN mill) (NNS plants)) (, ,) (CC and) (NP (NN leather))) (S (VP (VBG tanning) (S (NP (NNS factories)) (VP (VP (VB release) (NP (JJ organic) (NNS wastes)) (SBAR (IN that) (S (NP (JJ bacterial) (NNS populations)) (VP (VBP increase))))) (CC and) (VP (VB use) (PRT (RP up)) (NP (NP (DT the) (NN oxygen)) (PP (IN in) (NP (DT the) (NN water)))))))))) (. .)))
ORGANIC WASTES Domestic sewage treatment plants, food processing plants, paper mill plants, and leather tanning factories release organic wastes that bacterial populations increase and use up the oxygen in the  water.
(ROOT (S (NP (NNS Plants)) (VP (CONJP (RB not) (JJ only)) (VP (VBP contribute) (NP (NN food))) (CC but) (VP (VBD oxygen) (PP (IN for) (NP (NNS organisms))))) (. .)))