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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
3.3.2 Decentralized Wastewater System
- Categories: 3.3 Decentralized vs. Centralized Rural Wastewater Management
- Time of issue: 2022-04-28 18:15:09
- Views: 0
A decentralized wastewater treatment system (DWTS) is also called as onsite wastewater treatment system, which is installed at or near a household or a cluster of homes to treat domestic sewage generated nearby rather than collecting and transporting wastewater to a centralized treatment plant (Figure 3.5).
Figure 3.5 Schematic diagram of DWTS
Decentralized wastewater treatment systems are widely applied in rural areas where the public sewer system is not available or feasible, especially for areas with low population density and complex topography. It ranges from individual septic tanks to cluster systems that serve multiple properties, and to advanced treatment systems with high quality effluent. The disposal of effluent is close to the source of generation. It is critical that although wastewater treatment facilities are decentralized when applying DWTS, a centralized administration and management program shall be in place to ensure system sustainability.
Compared to centralized wastewater treatment systems, the decentralized wastewater treatment systems may provide a more cost-effective and efficient alternative for treating wastewater and protect public health.
- Cost-effectiveness: application of DWTS not only avoids large upfront capital costs on large infrastructure and piping systems for wastewater collection, but also reduces the operation and maintenance costs applying small-scale facilities, relatively simple equipment, and energy-saving processes (passive treatment like soil dispersal).
- The DWTS provides flexible and wide variety of wastewater management options to cope with specific topography and climate conditions.
- Use of natural treatment properties of the soil: in some DWTS, soil acts as a natural filter and provides final treatment by removing harmful bacteria, viruses, and nutrients, and keeps them away from entering natural water bodies.
The DWTS can create more job opportunities in the local wastewater industry