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PART I INTRODUCTION
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PART II INSTITUTIONAL AND REGULATORY FRAMEWORK
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2.INSTITUTIONAL, POLICY, REGULATORY FRAMEWORK FOR RURAL SANITATION AND WASTEWATER MANAGEMENT
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2.1 Overview
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2.2.Institutional Arrangement
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2.3.Policies and Regulations
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2.4 Discharge Standards
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2.5.Sources of funds
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2.6.Typical provincial cases
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2.7.Conclusions and recommendations
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PART III TECHNICAL BASIS
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3 Overview of Rural Sanitation and Wastewater Management
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3.1 Domestic Wastewater
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3.2 Rural Toilets in China – Source of Black Water
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3.3 Decentralized vs. Centralized Rural Wastewater Management
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4 Rural Wastewater Treatment Technology
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4.1 Preliminary Treatment
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4.2. Primary Treatment
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4.3 Secondary Treatment
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4.3.1 Attached Growth Process
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4.3.2 Suspended growth Process
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4.3.3 Waste Stabilization Pond
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4.3.4 Constructed Wetlands
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4.3.5 Subsurface Wastewater Infiltration Systems
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5 Wastewater Treatment Process Design
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5.1 General Design Consideration
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5.2 Sewage Collection Alternatives
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5.3 Wastewater Treatment Process Design
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5.4 Water Reuse
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5.5 Sludge Management
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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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6.3.1 Physical Conditions Assessment
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6.3.2 Community’s Capacity Assessment
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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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7.1 Why Need Community Participation?
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7.2 Principles of Community Participation
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7.3 Community Participation Activities
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PART V PROJECT FINANCING
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8 Financing, Subsidies, and Cost Recovery
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8.1 Programmatic Costs
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8.2 Project Implementation Costs
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8.3 Project Financing
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8.4 Subsidies
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8.5 Cost Recovery
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PART VI PROJECT IMPLEMENTATION AND MANAGEMENT
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9 Procurement and Implementation
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9.1 Procurement Principles
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9.2 Procurement Alternatives
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9.3 Procurement Planning
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10 System Adminstration, Operation, Maintenance and Monitoring
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10.1 Introduction
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10.2 Management and Administration Arrangement
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10.3 Operation and Maintenance
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10.4 Reporting and Monitoring
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10.5 Operator Training and Support
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Appendix: Case Studies – Rural Wastewater Management in Zhejiang, Shanxi, and Jiangsu Province
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1.Zhejiang Province
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2.Shanxi Province
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3.Jiangsu Province
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4.Summary
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REFERENCES
5.5.1 On-site Sludge Management
- Categories: 5.5 Sludge Management
- Time of issue: 2022-04-28 20:20:48
- Views: 0
The on-site management of sludge is a feasible and cost-effective method for rural villages. Sludge drying beds are the most common and easily managed method for sludge drying and treatment. A sludge drying bed is a simple, permeable bed that, when loaded with sludge, collects percolated leachate and allows the sludge to dry by evaporation. Approximately 50% to 80% of the sludge volume drains off as liquid back to the treatment plant. A drying bed system usually includes at least two drying beds, used alternately to make sure the solids are adequately dried and stabilized before the sludge is removed. The bottom of the drying bed is lined with an impermeable liner or concrete and has a perforated pipe on the bottom to collect and convey leachate back to the treatment process. Above the pipes are layers of gravel and sand that support the sludge and allow the liquid to drain freely to the underdrain pipe. When the sludge is dried, it can be used as an organic soil additive or added to compost for additional treatment if it does not contain any contaminants, such as heavy metals. In cold and/or wet regions, the sand bed can be either installed in an enclosure or under a roof to minimize inundation from rainfall.
The indicative capital costs for sludge treatment facilities in concentrated rural wastewater treatment stations/plants are shown in Table 5.3.
Table 5.3 Indicative costs for onsite sludge treatment facilities
Process |
Cost per ton wastewater (RMB) |
|||
Capacity <100 m3/d (wastewater volume) |
Capacity 101-500 m3/d (wastewater volume) |
Capacity 501-1000 m3/d (wastewater volume) |
Capacity 1001-5000 m3/d (wastewater volume) |
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Sludge dewatering |
520-1300 |
260-520 |
220-260 |
160-220 |
Sludge drying |
260-520 |
240-260 |
190-240 |
130-190 |
Sludge digestion |
390-650 |
390-580 |
350-520 |
320-490 |
Sludge composting |
160-190 |
130-160 |
100-130 |
90-100 |
Source: Guideline for Construction and Investment of Rural Domestic Wastewater Treatment Project (2013)