Starch waste effluents

Strolle, E. O., Aceto, N. C., Stabile, R. J., Turkot, V. A. (1980). Recovering useful by-products from potato starch factory waste effluents - feasibility study. Food TechnoL, 34, 90-95. 

Corn Starch. UF can recover colloidal starch and other high molecularweight compounds that contribute to the high COD level of the waste effluent from a corn starch plant. Unfortunately, the value of the materials recovered is not high. The plant must be justified on the basis of pollution abatement.67... 

Development work has been carried out on processes to produce feed from starch effluents in non-aseptic waste treatment systems (such as oxidation ditches and aeration ponds) using amylolytic filamentous fungi. These often belonging to the genera Aspergillus and Rhizopus. In such processes, the levels of contaminating bacteria are depressed by operating the systems at low pH. 

The main nutrients which are present in a paper mill effluent are carbohydrates from wood pulp or from waste paper, and also products which arise from their degradation. Compositions may be very variable and depend to a large extent upon the type and amount of waste paper, if any, which is being used. Recycled coated and surface-sized papers will introduce significant amounts of soluble polymers, in particular starch, which were used in the original surface treatment. 

For production of woodfree uncoated and coated fine papers up to 40 kg starch per ton of paper are applied. 3 to 10 kg starch is added at the wet end, with the aim of internal strength improvement and retention increase. The major share of the starch is added to the sheet in surface treatment. A mass balance on a typical fine paper machine has shown, that more than 90% of the added starch is retained in the final paper product. Losses occur mainly during the sheet forming process in the wire section due to insufficient retention. Starch which is not held back in the paper is discharged with the process effluents to the waste water treatment plant, where a complete biodegradation process follows. 

Production All process steps included, except for packaging and distribution. Sensitivity analyses for (i) production at customer s site and (ii) direct production from starch. All process steps included. The following options are distinguished for starch polymers and EPS Starch polymers EPS - Corn (maize) - Virgin PS - Potato - PS pre-consumer waste (industrial waste) - Potato with - PS post-consumer waste from MC/CD effluent use covers - Wheat, intensive - PS post-consumer waste from EPS - Wheat, extensive packaging - PS post-consumer waste from DSD (cups)... 

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