Tham khảo tài liệu 'membranes for industrial wastewater recovery episode 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Case studies 25 permeate Table . Suspended solids and M-hexanc extractable compounds are similarly reduced from 1120 and 475 mg I-1 to less than 1 mgk1 respectively. The final RO stage produces a permeate with a final conductivitj of 12 5 pS cm 1. Combined water and sewerage charges in the city of Yokosuka are 607 m 5 5 m-5 . The plant operates for 260 days per years and so the installation and operation of the reuse plant results in a direct saving Table 1 of 20 3 38 000 S 1 39 31 5 per annum with an additional Y1 400 000 S9590 saved through reduced chemical demands on the boiler system. The total annual costs of running the additional treatment technology is 5 406 300 S3 7 03 3 resulting in a net annual saving of 14 931 700 SI 02 282 . The cost of the plant is covered bj offsetting 3 000 000 20 5 50 per year as depreciation on the plant over its projected lifetime yielding a true annual saving of Y11 931 700 81 732 . Pasfrost vegetable processing plant Belgium Background Pasfrost. located in Passchendaele western Belgium is a vegetable processing company producing 6 5 000 tonnes of deep-frozen vegetables per year. The plant processes a wide variety of vegetables depending on the season ranging from squashes and leaf crops in the summer to root vegetables in the winter. Process water is used at the site for a range of activities such as washing rinsing. blanching steam peeling caustic peeling and cooling. Traditionally water is supplied from groundwater sources that are bacteriologically safe and require no treatment prior to use. However economic development in the region has led to increasing pressures on the ground water sources resulting in the need to abstract from wells over 300 m deep. The quality Table Cost sheet for wastewater treatment reuse plant as of 1998 Annual cost Y Annual saving Y MBR energy 120m1 d 1 MBR membrane 1120 m d 1 RO energy 140 m d_ RO membrane 40 m d 11 Total opex Y m- 925 500 6139 3 600 000 24 660 280 800 .
