2012年-世界发展银行全球_Economic_Assessment_of_Sanitation_Interventions_in_Yunnan_Province_Peoples_Republic_of_China_176页_7mb

Summary of the Economic Assessment of Sanitation Interventions in Yunnan Province, China

Core Content

This document presents the findings of a six-country study conducted under the Economics of Sanitation Initiative (ESI), with a specific focus on Yunnan Province, China. The study evaluates the economic and health benefits of various sanitation interventions across rural, urban, and peri-urban areas in Yunnan, aiming to inform sustainable sanitation development and improve investment efficiency.

Main Viewpoints

• Sanitation Progress in Yunnan: Yunnan has made significant strides in improving sanitation access since the early 1990s, but it still lags behind the national average, especially in rural areas.
• Cost-Effectiveness of Sanitation Options: The study highlights that improved sanitation options are highly cost-effective in terms of health outcomes, with benefit-cost ratios (BCR) ranging from 1.9 to 9.4 across different sites.
• Health Benefits: Poor sanitation leads to significant health costs, including disease incidence, productivity loss, and premature mortality. The study emphasizes that each step up the sanitation ladder reduces these costs.
• Water Quality Impact: Poor sanitation practices negatively affect water quality, with high levels of contaminants like E. coli, NH₃-N, TN, and TP in rural and peri-urban areas.
• Time Savings: Households without private toilets spend significant time accessing sanitation facilities, which translates into economic savings when these times are valued at a percentage of average wages.
• Excreta Reuse: The reuse of human excreta as fertilizer and biogas production offers additional economic and environmental benefits.
• Intangible Benefits: Improved sanitation is valued for privacy, cleanliness, comfort, and non-pollution, with these factors influencing household preferences and decision-making processes.

Key Information

A. Introduction

• Yunnan is an underdeveloped western province in China.
• Access to improved sanitation has increased rapidly, especially in rural areas.
• Despite progress, Yunnan still faces significant challenges in sanitation access compared to more developed regions.
• 6.4% of Yunnan’s population (45 million) lives under the poverty line, lacking access to safe and sanitary latrines.
• The study aims to provide evidence-based decision-making for sustainable sanitation development, focusing on economic viability and efficient delivery modes.

B. Study Aims and Methods

• The study evaluates costs and benefits of various sanitation options.
• Health, water quality, time savings, excreta reuse, and quality of life improvements are considered.
• Benefit-Cost Ratio (BCR) and cost per DALY averted are the primary indicators used.
• Ideal vs. Actual Performance: Ideal performance assumes 100% utilization, while actual performance is based on survey data.

C. Study Sites and Data Sources

• Three Rural Sites:
  • Luquan mountainous villages (R1) – Yi and Miao ethnic groups.
  • Dali Shangguan lakeside plain (R2) – Bai ethnic group.
  • Qiubei villages (R3) – Zhuang, Miao, and Yi ethnic groups.
• Three Urban Sites:
  • Kunming (U1) – high population density and water scarcity.
  • Dali (U2) – prefectural capital, flush toilets are common.
  • Qiubei (U3) – county capital, public and private flush toilets and pit latrines are used.
• Two Peri-Urban Sites:
  • Kunyang town (PU1) – part of the Kunming urban agglomeration.
  • Dali Zhoucheng (PU2) – rapidly urbanizing area with Bai ethnic group.

D. Results

D1. Cost-Benefit Analysis

• Rural BCRs:
  • UDDT: 9.4
  • Private pit latrine: 8.5
  • 3-in-1 biogas unit: 6.9
  • Shared toilet: 6.0
  • Private septic tank: 4.7
• Cost per DALY averted:
  • UDDT: $230
  • Septic tank: $557
• Urban BCRs:
  • Public toilets: 4.5
  • Septic tanks: 2.8
  • Sewerage: 1.9
• Cost per DALY averted:
  • Public toilets: $558
  • Septic tanks: $886
  • Sewerage: $1,385
• Peri-Urban BCRs:
  • UDDT: 8.7
  • Private latrine: 7.6
  • Septic tank: 6.1
  • Shared toilet: 4.2
• Cost per DALY averted:
  • Septic tank: $557
  • Sewerage: $105

D2. Costs

• Investment costs vary by sanitation option and location.
• In rural areas:
  • Shared toilet: $135
  • Pit latrine: $159
  • UDDT: $165
  • Biogas: $336
  • Septic tank: $484
• In urban areas:
  • Public toilet: $187
  • Septic tank: $497
  • Sewerage: $629
• Recurrent costs (O&M) range from $15 to $72 per household annually.
• Total annual costs range from $29 to $105 per household, depending on the sanitation option.

D3. Health Benefits

• Disease burden is high in rural areas, with 1.9 cases per person per year.
• Health care costs, productivity loss, and premature mortality costs are significant.
• Moving from open defecation (OD) to basic sanitation averts $279.8 in rural areas, $276.5 in urban areas, and $195.5 in peri-urban areas.

D4. Water Benefits

• Water quality is poor in many areas due to poor sanitation practices.
• Piped water is more accessible in urban and peri-urban areas.
• Water treatment costs are higher in urban areas, and boiling is the dominant method of water treatment at home.

D5. Access Time Savings

• Households without private toilets spend significant time accessing sanitation.
• Rural: 37.6 days/year
• Urban: 24.0 days/year
• Peri-Urban: 36.6 days/year
• Economic savings from reduced access time are:
  • Urban: $60
  • Peri-Urban: $64
  • Rural: $44

D6. Excreta Reuse Benefits

• Excreta reuse as fertilizer and biogas provides economic and environmental benefits.
• Annual savings from excreta reuse:
  • As fertilizer: $47
  • As biogas: $77
• Biogas units also benefit from animal manure.

D7. Intangible Benefits

• Focus Group Discussions (FGDs) involving over 100 participants (60% women) revealed:
  • Comfort and proximity are the top reasons for owning a toilet.
  • Privacy, cleanliness, and non-pollution are also important.
  • Shared toilets are less preferred due to lack of privacy and cleanliness.
• Private toilets are preferred in urban areas, with high satisfaction levels.
• Behavior change is a key barrier to adoption of new sanitation technologies like UDDT.