2018年-世界发展银行全球_Wastewater___From_Waste_to_Resource_-_The_Case_of_Santa_Cruz_de_la_Sierra_Bolivia_6页_735kb

报告摘要

Summary of Wastewater: From Waste to Resource - The Case of Santa Cruz de la Sierra, Bolivia

Core Content

The document discusses the implementation of covered anaerobic ponds in Santa Cruz de la Sierra, Bolivia, as a solution to wastewater treatment challenges. It highlights the city's rapid population growth, infrastructure limitations, and the resulting environmental issues such as groundwater contamination and high methane emissions. The project, led by SAGUAPAC, aims to address these problems through an integrated approach that combines wastewater treatment with energy generation and carbon credit sales.

Main Objectives

Increase wastewater treatment capacity in a cost-effective manner
Expand wastewater coverage and improve operational efficiency
Generate cost savings through energy production
Reduce greenhouse gas (GHG) emissions from urban wastewater treatment
Use market-based instruments for financing

Key Technologies and Innovations

Covered anaerobic lagoons are used for wastewater treatment, offering lower capital and operational costs compared to conventional methods.
Methane gas capture and controlled burning reduces GHG emissions and produces carbon credits.
Potential for electricity generation from captured biogas could supply over one-third of SAGUAPAC's energy needs, with estimated annual savings of up to US$1 million.

Project Implementation

SAGUAPAC operates four wastewater treatment plants (WWTPs) with anaerobic lagoons.
The methane gas is collected, processed through water traps, and burned at a station.
The project was partially financed by the World Bank Bolivia Urban Infrastructure Project and SAGUAPAC's internal funds.
A carbon finance mechanism was established through the Community Development Carbon Fund (CDCF) to purchase emission reductions (CERs and VERs).

Legal and Regulatory Challenges

The Law of the Rights of Mother Earth (2010) changed Bolivia's legal framework, making the sale of carbon credits inconsistent with the law.
This led to the cancellation of the CER purchase agreement with the World Bank, impacting the project's financial viability.
The lack of a clear legal framework for electricity transmission fees and intersectoral cooperation between water and energy utilities delayed the project's full realization.

Benefits

For SAGUAPAC	Environmental
• Lower O&M costs compared to other technologies	• Climate change mitigation through GHG reduction
• Improved treatment capacity via biogas heating	• Displacement of over 44,000 tons of CO₂e annually
• Investment secured through World Bank and private funding	• Reduction of odors to residential areas
• Potential for electricity generation	• Community benefit plan to connect 600 families to the sewage system

Lessons Learned

Ambiguous legal and regulatory frameworks hinder the realization of environmental and economic benefits.
Methane gas capture facilities have proven beneficial, even without CDM revenues, by improving treatment efficiency and safety.
A strong implementation capacity and interest from SAGUAPAC were crucial to the project's success.
An integrated approach combining infrastructure and market instruments like CDM can create added value in sanitation projects.
Future projects should anticipate regulatory challenges and plan accordingly.

Conclusion

The Santa Cruz Anaerobic Ponds and Methane Gas Capture project demonstrates the potential of combining wastewater treatment with energy generation and carbon finance. However, it also highlights the importance of stable legal and regulatory frameworks in ensuring the project's long-term success and sustainability. The project remains a model for integrating environmental and economic benefits in urban wastewater management.

Notes

A Designated National Authority (DNA) is required for CDM participation, and Bolivia established one to facilitate the project.
The CDM eligibility rules ensure that projects contribute to local sustainable development goals.

References

Bachmann, N. 2015. Sustainable Biogas Production in Municipal Wastewater Treatment Plants. IEA Bioenergy.
Camara de Industria y Comercio Santa Cruz. 2016. Bolivia y Santa Cruz en Cifras.
Crawford, G., and J. Sandino. 2010. Energy Efficiency in Wastewater Treatment in North America.
Nolasco, D. 2014. Electricity Use and Potential Generation at Wastewater Treatment Utilities.
UNFCCC. 1997. Designated National Authorities.
U.S. EPA. 2014. Wastewater Technology Fact Sheet: Anaerobic Lagoons.
World Bank. 2007. Bolivia-Urban Wastewater Methane Gas Capture Project.
——. 2014. Note on Cancelled Operation (P104092).