All categories
-
PART I INTRODUCTION
-
PART II INSTITUTIONAL AND REGULATORY FRAMEWORK
-
2.INSTITUTIONAL, POLICY, REGULATORY FRAMEWORK FOR RURAL SANITATION AND WASTEWATER MANAGEMENT
-
2.1 Overview
-
2.2.Institutional Arrangement
-
2.3.Policies and Regulations
-
2.4 Discharge Standards
-
2.5.Sources of funds
-
2.6.Typical provincial cases
-
2.7.Conclusions and recommendations
-
-
-
PART III TECHNICAL BASIS
-
3 Overview of Rural Sanitation and Wastewater Management
-
3.1 Domestic Wastewater
-
3.2 Rural Toilets in China – Source of Black Water
-
3.3 Decentralized vs. Centralized Rural Wastewater Management
-
-
4 Rural Wastewater Treatment Technology
-
4.1 Preliminary Treatment
-
4.2. Primary Treatment
-
4.3 Secondary Treatment
-
4.3.1 Attached Growth Process
-
4.3.2 Suspended growth Process
-
4.3.3 Waste Stabilization Pond
-
4.3.4 Constructed Wetlands
-
4.3.5 Subsurface Wastewater Infiltration Systems
-
-
-
5 Wastewater Treatment Process Design
-
5.1 General Design Consideration
-
5.2 Sewage Collection Alternatives
-
5.3 Wastewater Treatment Process Design
-
5.4 Water Reuse
-
5.5 Sludge Management
-
-
-
PART IV PROJECT PLANNING AND DESIGN
-
6 Project Planning and Design
-
6.1 Diagnosis for Project Villages – Initial Community Assessment
-
6.2 Establishment of Stakeholder Group
-
6.3 Assessment on Existing Conditions and Community’s Capacity
-
6.3.1 Physical Conditions Assessment
-
6.3.2 Community’s Capacity Assessment
-
-
6.4 Baseline Engineering Survey and Assessment
-
6.5 Project Feasibility Study and Environmental Impact Assessment
-
6.6 Selection of Operation Model
-
6.7 Project Cost Estimate
-
-
7 Community Participation
-
7.1 Why Need Community Participation?
-
7.2 Principles of Community Participation
-
7.3 Community Participation Activities
-
-
-
PART V PROJECT FINANCING
-
8 Financing, Subsidies, and Cost Recovery
-
8.1 Programmatic Costs
-
8.2 Project Implementation Costs
-
8.3 Project Financing
-
8.4 Subsidies
-
8.5 Cost Recovery
-
-
-
PART VI PROJECT IMPLEMENTATION AND MANAGEMENT
-
9 Procurement and Implementation
-
9.1 Procurement Principles
-
9.2 Procurement Alternatives
-
9.3 Procurement Planning
-
-
10 System Adminstration, Operation, Maintenance and Monitoring
-
10.1 Introduction
-
10.2 Management and Administration Arrangement
-
10.3 Operation and Maintenance
-
10.4 Reporting and Monitoring
-
10.5 Operator Training and Support
-
-
-
Appendix: Case Studies – Rural Wastewater Management in Zhejiang, Shanxi, and Jiangsu Province
-
1.Zhejiang Province
-
2.Shanxi Province
-
3.Jiangsu Province
-
4.Summary
-
-
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.