Activated Carbon Manufacturer, UK
The membrane bioreactor (MBR) unit treating wastewater onsite at this production facility was producing excess biological solids, inhibiting the reactor’s performance. As a result, excess solids would be discharged into the effluent treatment plant which could lead to failures or an increase in strength of discharge quality. These were potentially challenging and costly outcomes, that could have resulted in higher water company trade effluent charges. In addition, large amounts of electricity were used to in efforts to overcome the plant’s inefficiencies.
After the success of initial lab tests, a Volute dewatering screw press was trialled to remove and dry the excess solids. This proved the process at little cost to the client. A full-scale automated remote-controlled system to effectively treat the excess solids was then designed, built, installed and commissioned. Environmentally-friendly chemicals that produce a dry cake to be composted for land spread were also provided, backed up by ongoing technical support from a team of technical experts.
Atana (a WCS Environmental Engineering company) worked in partnership with the client to provide a tailored solution that gave greater control of the treatment system. The MBR unit runs more efficiently, saving on energy and cost, performing at optimum levels and reducing operator intervention time. The risk of discharge quality failures has dropped to negligible levels and water company trade effluent costs have been reduced.
The Volute dewatering screw press offers both sludge thickening and dewatering for industrial wastewater applications and can significantly reduce sludge volume by up to 30-40%. Low energy, low noise and fully automated, it runs a continuous process, with a unique self-cleaning mechanism that prevents clogging. The technology is suitable for industrial, primary and secondary treatment sludges, aerobic and anaerobic biosolids and digestate dewatering and oily sludges.
Food Manufacturer, UK
The site’s existing effluent treatment plant was not meeting consent standards for discharge quality. As well as the risk of fines and prosecutions, the problem was costly due to the need for tankers to be deployed to take the wastewater offsite. It was also time consuming – the company spent many hours trying to make the process run efficiently.
Atana (a WCS Environmental Engineering company) trialled a pilot dissolved air floatation (DAF) unit to remove the high loadings. Once the process was proved, engineers designed, built, installed and commissioned a system to effectively treat the complete flow. For ongoing treatment, chemicals that produce a reduced strength effluent to the downstream biological units were also provided.
Following commissioning of the DAF system, the client is meeting its discharge consents and the environmental regulator is satisfied with the treatment solution. The biological systems now runs far more effectively and energy costs for operation have been reduced. In addition, the operators are no longer spending time trying to resolve the daily process issues and can be far more efficient in their work time.
For effluents containing concentrations of fats, grease, oil, colour, organic matter, biological sludges, colloidal material and phosphates, the DAF is typically used to mitigate the financial impact of trade effluent charges and maintaining environmental compliance. Ideal for pre-treatment of wastewater, it can reduce suspended solids, fats and greases by up to 90% depending on application.