Parameter	Biomethanated Spentwash Feed	Rochem Treated
TDS (PPM)	30,000	< 1,000
COD (PPM)	50,000	<250
BOD (PPM)	12,000	<30
Recovery	50% - 70%

* Similar recoveries on raw spentwash (feed Cod 1,600,000 PPM)

CASE STUDIES

Rochem Installation - Raw Spentwash Treatment
MOLASSES BASED EFFLUENT UNIT, BELGAUM

Parameter	Raw feed
Background	Distilleries producing alcohol using sugar cane molasses as the raw material produce considerable quantity of one of the most obnoxious effluents, with high BOD, COD & TDS. It is called Spentwash or Dunder or Vinasse. Depending on the technology of fermentation & distillation being used the effluent quality may vary from about 7Lts. to 15Lts. per litre of alcohol produced. Accordingly the values for BOD range from 50,000 ppm to 70,000 ppm; COD from 100,000 ppm to 200,000 ppm. Apart from these high pollutant values, its colour is dark blackish brown, which was found impossible to be removed by any known technology. Otherwise, due to its large volume dark colour & high degree of pollutants, its pollution control & proper disposal has been a challenge.
Plant Installed	Single Stage RO System (Semiautomatic Version)
Input	450 cum/day of Raw Spent Wash
Recovery Rate	50%

 Plant Performance :

Parameters	Unit RO	Effluent (Input to RO)	Output
Flow Chemical Oxygen Demand	cum/day	450	225
Colour	-	Reddish Brown	Colourless
pH	-	4.5	7.0 (After pH Correction)
Total Dissolved Solids	ppm	30,000	< 1500
Chemical Oxygen Demand	ppm	120,000	< 2000
Brix	-	13	-

Salient Features : The installed system treats the input wastewater to generate 50% colourless permeate of which can be reused for fermentation while reducing the total hydraulic load of the wastewater.

The concentrated waste can now be subjected to disposal technologies such as composting & incineration which are viable in view of the reduced hydraulic load.

Unit has run successfully & continuously at rated capacity for last 1 yr. without requirement of membrane replacements.