All categories
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PART I INTRODUCTION
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PART II INSTITUTIONAL AND REGULATORY FRAMEWORK
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PART III TECHNICAL BASIS
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3 Overview of Rural Sanitation and Wastewater Management
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4 Rural Wastewater Treatment Technology
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5 Wastewater Treatment Process Design
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PART IV PROJECT PLANNING AND DESIGN
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6 Project Planning and Design
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6.1 Diagnosis for Project Villages – Initial Community Assessment
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6.2 Establishment of Stakeholder Group
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6.3 Assessment on Existing Conditions and Community’s Capacity
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6.4 Baseline Engineering Survey and Assessment
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6.5 Project Feasibility Study and Environmental Impact Assessment
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6.6 Selection of Operation Model
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6.7 Project Cost Estimate
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7 Community Participation
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PART V PROJECT FINANCING
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PART VI PROJECT IMPLEMENTATION AND MANAGEMENT
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9 Procurement and Implementation
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10 System Adminstration, Operation, Maintenance and Monitoring
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Appendix: Case Studies – Rural Wastewater Management in Zhejiang, Shanxi, and Jiangsu Province
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REFERENCES
4.1.1 Bar Screens
- Categories: 4.1 Preliminary Treatment
- Time of issue: 2022-04-28 18:19:57
- Views: 0
Description:
Information
Bar Screen
A screen is a device with openings, generally of uniform size, that is used to retain solids in the influent wastewater to the treatment facilities. A bar screen uses parallel bars as the screening element to remove coarse solids in raw wastewater.
Figure 4.1 Schematic diagram of a bar screen
(Source: 3D Warehouse)
Design Criteria:
- The approach velocity in the channel with the screen shall be less than 1 m/s. Low flowrate may result in sedimentation of coarse materials in the channel, while high flowrate will increase the head loss or force screenings passing through the bars.
- The spacing of the bars should be 15 to 25 mm.
- The bars should be inclined to 60 degrees to the horizontal.
- The screen should be designed to allow for easy daily cleaning.
Operation and Maintenance:
- Required regular inspection and cleaning to avoid unpleasant odor from the degradation of accumulated materials.
- The screenings, normally consists of leaves, branches, plastic bags, toilet papers etc., can be disposed with domestic solid waste in an environmentally sound way.