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Urban development is rapid, sharply increase of the population and rapid development of industry, inevitably produces a large number of life and industrial wastewater. Because these urban sewage of organic matter content high, if direct emissions into the water, will cause severe environmental pollution. Therefore, many scholars and manufacturer of municipal sewage done a lot of research, and achieved gratifying achievements.
This design topic is 80,000 tons/day urban sewage CASS process design. The main task of the sewage treatment plant was completing preliminary design and single processing structure construction design. This project aimed at the characteristics of urban sewage, adopted new technology to handle CASS urban sewage treatment.
The effective management of urban sewage should follow the following principles:
(1) according to the characteristics of urban sewage choose reasonable and feasible treatment process route, accomplish process is advanced, the technical reliable, convenient operation, easy maintenance, etc.
(2) determines various process parameters, and analysis to determine the optimal value.
(3) using new materials, new technology, new product to prolong the service life of equipment.
(4) in guarantee under the premise of treatment effect, reduce occupied land area, in order to reduce the investment in infrastructure and daily operation cost.
Design content including sewage treatment and sludge treatment and disposal of two parts.
The sewage plant of wastewater treatment process for: from coarse to the sewage pump room, ascension grid through fine grille, to sink sand pool again by CASS reactor, finally effluent;
Sludge flow from CASS reactor for: discharge of excess sludge first enter enrichment pool, into the dehydration room, finally sinotrans disposal.
Sewage water quality reaches the national processed the integrated wastewater discharge standard "(1996) GB8978 - in first grade level. Feed water quality and effluent is as follows:
The incoming water: COD = 600 mg/L; BOD5 = 240 mg/L, SS = 280mg/L, NH3 - N = 45 mg/L.
Effluent BOD5 20mg/L for: 20mg/L, SS for CODcr 60mg/L for, for 15mg, NH3 - N/L).
The sludge treatment route as follows:
Sludge - sludge concentration pool - sludge dewatering and mud cake sinotrans between.
Design main structures are as follows: design data
Thick grille: clearance number is 31; Gate slot effective width for 1.85 m; Gate slot total height of 1.25 m; Gate slot chief 199 m. Two groups, one with a ready.
Set for 141.3 pool: effective volume; the m3 The height is 4.2 m; The length, width is was for 10m. Ascension 500QW2100-8 pump selection of sewage pump four, three with a ready.
Fine grille: clearance number is 70; Gate slot for effective width 104 m; Gate slot total height of 1.33 m; Gate slot chief 2.87 m. Three groups, amphibious a ready.
Bell type sinking sand pool: model 900; Flow 880L/s; Diameter 4.87 m; Theelectrohydraulic power 0.75 KW. Two.
CASS reactor: volume for 29076m3; Using four seat by the same reaction pool, pool, pool width 14.3 quadrangular 71.5 m length of m, high 7.2 m. Every pool 2 sets of pressure cylinder selection, Bi water decanter 1500m3 rotary Bi water depth, / h 1.3. Every pool choose 1 80QW50-10-3 type submersible sewage pump ascending sludge.
Sludge concentration pool: enrichment time take T = 18h; Area of 138.8 m2; Total height 8.4 m.
Sludge dewatering: set pressure filter between two.
This design USES the CASS process, this process system, good stability, and less sludge produced significant quantities of methane gas, can use integratedly.
Keywords: CASS; Urban wastewater treatment.
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