Wastewater recycling in small laundries using MBR-technology

Аннотация

The operation of laundries in Germany is characterized by high water and energy consumption. The business competition, increase of energy cost and active legislative requirements provide for growing demand for wastewater reuse systems (for process water treatment, heat and chemical recovery). In relation to the washing technology the level of water saving is rather high. However, the consumption of fresh water cannot be reduced unless the technologies of wastewater treatment and reuse have been integrated into the existing system. There are few if any examples of using wastewater reuse technologies for small laundries with a capacity of less than 500 kg/day; whereas the available water recycle systems are not efficient enough. A membrane bioreactor with flat submerged ultrafiltration membranes was installed at one of such laundries. The operation of the bioreactor provided for 93% COD reduction, and 90% water return. The quality of permeate was very high (it did not contain suspended solids or microbes) and met the requirements to the reuse in washing process. The cost analysis showed that the use of available permeate heat instead of electrical energy improved the economic efficiency of the laundry operation.

Ключевые слова

ultrafiltration , heat utilization , membrane bioreactor , laundry wastewater , water recycling , industrial wastewater treatment

The experience of implementing comprehensive solutions in industrial wastewater treatment

Summary

The practical experience of the implementation of local treatment facilities of industrial enterprises on a turnkey basis: dairy plants, poultry farms, enterprises for the production of soft drinks, chemical industries, etc. is summarized. The differences in the implemented schemes of local wastewater treatment in different industries are described, process indicators of the operation of the treatment facilities are presented. The use of mathematical modeling of biological treatment facilities (classical scheme, membrane bioreactor, etc.) provides for a high degree of convergence of the calculated design values and indicators obtained during commissioning. The automation system developed by the Russian engineers provides for arranging the unattended operation of the treatment facilities, improving the reliability of the facilities, and reducing the operating and maintenance costs. MY DAF, MY MBR and MY BION comprehensive solutions used in the implementation of the treatment facilities from design to commissioning, guarantee the achievement of the required effluent quality before discharging into a municipal sewer or a water body. 30 years of experience of MY PROJECT JSC in the implementation of integrated projects of wastewater treatment facilities gives a guarantee of successful implementation of projects in the future.

Key words

nitri-denitrification , membrane bioreactor , industrial wastewater treatment , comprehensive process solutions , chemical pressure flotation