An in-plant survey was carried out in a typical fruit processing industry during mango and tomato processing seasons separately. The quantity of water used in the industry was about 160 cu m/day and the wastewater discharged was 130 cu m/day. The BOD loads contributed by the wastewater during mango processing and tomato processing were 286. 7 kg/day and 163. 8 kg/day respectively. Loboratory experiments were carried out on the treatment of these waste waters by simple settling, chemical treatment and biological treatment. Simple settling for 3 hours gave a BOD reduction of 22. 2 to 33. 2 per cent and suspended solids removal of 50 to 54. 5 per cent. y treatment of the wastewater with 500 mg/1 of lime the BOD is reduced by about 39. 2 to 39. 5 per cent. By treatment of the wastewater with lime followed by alum the BOD is reduced by about 59. 5 per cent. The wastewater after chemical treatment and addition of nutrients or in admixture with sufficient quantities of sewage was found to be amenable to treatment in an oxidation ditch with 12 to 24 hr detention or in an aerated lagoon with 4 days detention. An in-plant survey was carried out in a typical fruit processing industry during mango and tomato processing seasons separately. The quantity of water used in the industry was about 160 cu m/day and the waste water discharged was 130 cu m/day. The waste water obtained during mango processing season was stronger than the waste water obtained during tomato processing season. The BOD loads contributed by the waste water during mango processing and tomato processing were 286.7 kg/day and 163.8 kg/day respectively. Laboratory experiments were carried out on the treatment of these waste water by simple settling, chemical treatment and biological treatment. Simple settling for 3 hours gave a BOD reduction of 22.2 to 33.2 per cent and suspended solids removal of 50 to 54.5 per cent. By treatment of the waste water with 500 mg/l of lime the BOD is reduced by about 39.2 to 39.5 per cent. By treatment of the waste water with lime followed by alum the BOD is reduced by about 59.5 per cent. The waste water after chemical treatment and addition of nutrients or in admixture with sufficient quantities of sewage was found to be amenable to treatment in an oxidation ditch with 12 to 24 hr detention or aerated lagoon with 4 days detention.