Efficient recycling of industrial wastewater has achieved remarkable results

In Tianjin, a steel company has completely replaced the conventional water resources of the enterprise by collecting and treating the municipal sewage of the local town and fully absorbing the water from the sewage treatment plant of the neighboring town, achieving zero discharge of wastewater and zero exploitation of groundwater. Some industrial parks in Beijing have also accelerated the pace of urban sewage utilization, and the high-quality recycled water produced after treatment is used as production water for enterprises in the park.

"In 2020, the national urban recycled water utilization rate is about 24%, from the utilization point of view, China's urban sewage treatment reuse amount is not high, the proportion of industrial space is still large." Yang Benxiao believes that increasing the use of urban recycled water will be the key direction of waste water recycling in industrial enterprises and parks.

Better excavation space --

Strengthen technological innovation and activate the impetus of enterprises

China has a complete range of industrial categories and many enterprises, but the scale, facilities and technical reserves are uneven, and the reuse rate of industrial water above the scale is still a gap compared with the international advanced level. What should we do to further explore the potential recycling space of industrial wastewater?

Technological innovation is the foundation. "Improving the reuse rate of industrial water depends on key core technologies." Liu Guohua, deputy dean of the School of Environment at Renmin University of China, said that the existing level of industrial wastewater treatment technology needs to be improved, and there is still room for improvement in industrialization and market recognition of localization technology. It is necessary to strengthen the research of advanced technology and equipment by strengthening the deployment of major special projects, so that the wastewater can meet the standards after treatment and truly be used for enterprise production.

According to the "Industrial Wastewater recycling Implementation Plan", through the national science and technology innovation plan and other funding channels, support the research and development of efficient and low-cost treatment and reuse technology and equipment of industrial wastewater in different industries, and actively promote the demonstration and promotion of application in relevant industries.

Activating motivation is key. "The current recycling technology of industrial wastewater is mostly based on the ability to change water, and the energy consumption and material consumption are generally high." Yang Benxiao introduced, for example, in northern water shortage areas such as Inner Mongolia and Ningxia, the implementation of enterprise wastewater zero discharge, the cost of enterprises using recycled water reached 6-10 yuan/ton, and the cost of high-salt wastewater treatment and reuse reached 30-60 yuan/ton, which is much higher than the average price of 3.1 yuan/ton of new water purchase, and it is necessary to increase tax incentives and other measures. Continuously enhance the power of enterprises to carry out waste water recycling.

In the next step, enterprises in typical industries that actively implement the recycling and transformation of industrial wastewater will be inclined in terms of tax policies and financial support, so as to encourage and guide enterprises in typical industries to take the initiative to implement water-saving transformation and wastewater recycling.