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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
3.1 Domestic Wastewater
- Categories: 3 Overview of Rural Sanitation and Wastewater Management
- Time of issue: 2022-04-28 18:10:46
- Views: 0
Domestic wastewater is the used water in households or communities for daily lives, which is generated from toilet flushing, food preparation, laundry, shower, house cleaning etc. It is classified into two categories, black water and grey water. The black water contains harmful bacteria and disease-causing pathogens and poses health risks to human beings.
The volume of domestic wastewater generated in rural areas accounts for 60%-90% of domestic water consumption (GB/T 37071-2018). Generally, the domestic water consumption varies depending on local economic conditions, water supply levels, and living habits. The average water consumption is the lowest in northwest China, where climate is arid with limited water resources and freezing winter, compared to that in other regions. In pace with the rural vitalization activities since 2018, living conditions in many villages have been improved significantly, with sustainable water supply access and inhouse plumbing fixtures installed. Normally, the domestic water consumption ranges from 30 to 200 liters per capita per day in rural areas in China as shown in Table 3.1. Exact water consumption data for a specific village should be obtained through detailed investigation. The referenced discharge coefficients in different areas and seasons are listed in Table 3.2. Typical characteristics of rural wastewater is shown in Table 3.3 and should be determined on the basis of actual monitoring.
Wastewater from agricultural activities and livestock raising generally has higher concentration of COD, nitrogen and phosphorus than that in domestic wastewater. For large scale of livestock farms, the daily amount of wastewater is significantly high. Considering the difference in water quality characteristics and amount, the domestic wastewater should be managed separately from wastewater from agricultural and livestock raising activities.
Table 3.1 Reference values of daily domestic water consumption in rural areas in China
(villages with municipal water supply)
Type of villages |
Domestic Water Consumption (L per capita per day) |
|||||
Northeast |
Northwest |
Southwest |
North China |
Southeast |
South and Central China |
|
With flush toilets, and shower facilities |
80-135 |
75-140 |
80-160 |
100-145 |
120-200 |
100-180 |
With flush toilets and without shower facilities |
40-90 |
50-90 |
60-120 |
40-80 |
90-130 |
60-120 |
Without flush toilets and shower facilities |
40-70 |
30-60 |
40-80 |
30-50 |
80-100 |
50-80 |
Source: Guide Rule of Rural Domestic Sewage Treatment (GB/T 37071-2018).
Table 3.2 Reference values of the discharge coefficient* of domestic wastewater in rural areas in China
Region |
Northeast |
Northwest |
Southwest |
North China |
Southeast |
South and Central China |
Wastewater discharge coefficient (all wastewater collected) |
0.7-0.9 |
0.7-0.9 |
0.6-0.9 |
0.8 |
0.7-0.9 |
0.6-0.8 |
*: the proportion of domestic wastewater to water consumption
Source: Guide Rule of Rural Domestic Sewage Treatment (GB/T 37071-2018).
Table 3.3 Reference values of raw domestic wastewater quality in rural areas in China
Parameter |
COD |
BOD5 |
NH3-N |
TN |
TP |
SS |
pH |
Reference value |
150-400 |
100-200 |
20-40 |
20-50 |
2-7 |
100-200 |
6.5-8.5 |
Source: Technical standards for domestic wastewater treatment engineering of rural area (GBT51347-2019).