Enhancing The Performance Of
A Wastewater Treatment Plant Processing
Wheat Starch Factory Tailings
Author(s)
E. F. Pidgeon & J. N. Ness
Abstract
The performance of a waste water treatment plant (WWTP) at a wheat starch
factory (average flour throughput of 59 t/day) is reported in this paper. Most
factory-generated wastestreams were processed through the onsite WWTP prior
to being discharged to a municipal wastewater treatment facility for further
treatment. One stream was trucked off-site as ‘liquid fertiliser’. Over the
two-year monitoring period, the onsite WWTP discharged an average of 430 kL
of wastewater per day (range 323–3,264, standard deviation 198) with an
average suspended solids (SS) concentration of 2,500 mg/L (range 610–11,700,
standard deviation 1,568) and an average BOD5 of 1,950 mg/L (range
140–13,000, standard deviation 1,855). Impacts to the WWTP as a result of
water usage and wastewater generation practices within the manufacturing plant
were investigated. The operation, effectiveness and maintenance of the system
were assessed in terms of how water usage and practices within the starch
recovery process affected effluent treatment performance. By-products of the
treatment process included beneficial and non-beneficial outputs. For example,
methane generated in the anaerobic digester was utilised in the boilers and offset
the purchase of natural gas costs while excess anaerobic sludge posed a disposal
problem, as there was no local market for this material. Performance inhibitors
were identified during the study, as well as the consequences of failure of the
anaerobic digester. Recommendations, based on theoretical background and
practical experience are provided for enhancing this kind of treatment system
and for reducing overall water usage in the starch factory.
Keywords: wheat starch, wastewater treatment, water usage, anaerobic
treatment.
Keywords
wheat starch, wastewater treatment, water usage, anaerobic
treatment.
Related Book
Other papers in this volume
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