Views: 0 Author: Site Editor Publish Time: 2018-03-26 Origin: Site
Sewage contains a large amount of chemical energy (COD) and thermal energy (remaining temperature), and its potential energy content can reach 9 to 10 times the energy consumed by sewage treatment operations. The conversion of chemical and thermal energy into waste water can actually be performed using conventional techniques. Conventional sludge anaerobic digestion and water-source heat pump technology can be effective. However, the seemingly simple and mature anaerobic digestion and water source heat pump technology is very limited in China's sewage treatment industry, and it is not popular. The reason is that technology is obviously not the primary factor. The lack of awareness and understanding of government management is the main bottleneck. The lack of effective policies/legislation and economic subsidies restricts the development and utilization of sewage potential. On this issue, the practices and experiences of developed countries such as Europe and the United States are worth learning and drawing lessons from.
Many countries and regions in the world mainly promote the development and utilization of sewage potential by promoting the development of clean energy and renewable energy.
Driven by both the development of clean energy and renewable energy, countries such as Europe and the United States began to develop and utilize the potential of sewage. Among them, EU countries have taken the lead in the world under the EU policy framework directive.
Sweden is one of the first countries in the world to recognize environmental issues and formulate corresponding environmental regulations. In the declaration of "Towards an oil-free country in 2020," Sweden proposes to become the first country in the world not to use oil by 2020. This action statement also directly promotes the development of sewage potential and takes it to a new stage.
Germany's biogas power generation industry in the European Union has always been a world leader, thanks to its sound policy support and effective legal protection. It indicates that the energy transformation in Germany will enter a new stage, and its return on investment benefits will be entirely regulated by the market. The new Renewable Energy Act came into effect on January 1, 2017. Instead of buying electricity at the government-guided price, it will use the market bid to pay for subsidies. The lowest-priced companies will be able to receive subsidies for new facilities at this price.
The Netherlands is a world leader in the research, development and application of organic waste water anaerobic digestion. Collecting resources and energy from sewage and waste is a circular economy model in the Netherlands. It also has corresponding policies and legal support.
As one of the member states of the European Union, Ireland has relatively lagged behind the development of sewage potential. In order to improve this situation, Ireland's policies and guidelines for the use of sludge have clearly stated that in addition to its use as a fertilizer and soil amendment, sewage sludge can be regarded as a valuable resource because of its high energy content. The plan calls for an increase in the recovery of sludge energy.
Its independent legal system supports development of sewage potential more than EU countries although Switzerland is not included in the EU member states.The energy supply framework has been constructed on a macro scale, and the use of waste heat from waste water treatment plants has been specified and standardized from a microscopic point of view.
The United States has used the form of legislation to make demands on the proportion of energy and has achieved significant results.
As early as April 2001,Australia required specific purchasers of electricity to submit statutory certificates to obtain annual electricity to promote the development of renewable energy.