Reference Wuxi Experience In Upgrading Equipment Selection (figure) - Wastewater Treatment -

Drainage deputy general manager of Wuxi, China Li stimulate water network of experts made

2009 6 27 days "2009 Water Industry Advanced Technology Forum," the next day morning, "wastewater treatment technology unit" in the drainage from the company's deputy general manager of Wuxi City, Wuxi City, Lee introduces bowel treatment plant upgrade in the middle of the situation and the transformation of trial and error process and equipment selection experience. It can be said of Taihu Lake in Jiangsu Province since 2007 Cyanobacteria event, first proposed upgrading of the goals, plans to complete 168 urban sewage nitrogen and phosphorus removal to provide standard transformation task, Wuxi area of 21 sewage treatment plants before the end of 2008 was the first l 1 A complete references to standard tasks, now part of the sewage treatment plant after transformation is already running more than a year.

Ashimura instance sewage treatment plant Ashimura sewage treatment plant located in Wuxi, eastern suburbs of Beijing-Hangzhou Grand Canal, an area of 245 acres, is better use of nitrogen and phosphorus removal in the A / A / O process, processing capacity of 200,000 tons / day secondary treatment, Ashimura plants involved in the upgrading of the main SS, COD, TN, NH3-N, TP, viruses and bacterial spores several aspects. The picture shows the view of the above problems under the settlement process and equipment options: advanced treatment processes 100,000 tons / day of sewage imported cloth filter, 95,000 tons / day of domestic wastewater using cloth filters, 5,000 tons / day effluent using membrane filtration; as the original aerobic stay relatively short time (4? 6 hours), by adding filler to increase the aerobic stage to 10 hours, another cold winter, when low rates of nitrification and denitrification, carbon Source inadequate, consider adding carbon.

Water sewage treatment plant under Ashimura characteristics (lack of carbon) and water quality requirements of biological treatment process used in the original section of A / A / O biological aerobic pool area adding filling process. Process, adjust the residence time: return sludge denitrification Section 0.5h, anaerobic 0.5h (with one or two as an example), anoxic 4.58h (including transition section 2.03h), the aerobic stage 4.61h , adding the name of the aerobic stage, after filling up residence time of 10.2h. With the summer and winter influent flow and concentration differences on the A / A / O of the water to do the matching and adjustment, sludge return ratio and the water from one form into many styles. Increase in the transformation of the transition section, the aerobic section of the winter as in summer as an anoxic to an example last month, TN from 15.1mg / L dropped to 12,13 mg / L.

New technology, new equipment comparison Micro-flocculation filtration, rotary filter, filter cloth fiber pile depth of processing of three different sewage treatment plant in the Wuxi area had applied, the effect was very good and can stabilize compliance. The following table shows the parameters of the comparison of three processes, it is noteworthy that the use of filter and cloth filter wheel when the head losses are less than 0.3m, the height of filter between the 2-3m is recommended if conditions can be designed to be higher if, after all, is to filter by pressure difference.

Table: Comparison of different depth analysis of treatment process

by: gaga

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