Upgrading and upgrading of industrial wastewater, zero discharge is the goal, not the goal
Sewage treatment equipment : http://euhowblog.com
After the introduction of the "Ten Water Articles", the national sewage treatment plant's upgrading and upgrading are accelerating. Recently, many experts are raising zero and ultra-low emissions of industrial wastewater, and many companies have advertised themselves with zero emissions.
What is Zero Emission? Do you want zero emissions for upgrading industrial wastewater?
Zero emissions, as far as its content is concerned, on the one hand, it is necessary to control the waste emissions generated during the production process and reduce them to zero; on the other hand, it is necessary to make full use of the wastes that have been discharged and ultimately eliminate non-renewable resources and energy The presence. Zero emissions. From a technical point of view, in the industrial production process, the transformation of energy, energy and resources follows certain natural laws. It is impossible to achieve the transformation of resources into various kinds of energy, the mutual transformation of various kinds of energy, and the conversion of raw materials into products. 100% conversion.
It can be seen from the above that zero emissions should not be a goal, it should be a goal, and it should be the pursuit of substances as a product process. The advanced treatment of industrial wastewater is also a multi-objective coupling purpose-harmony between man and nature, economic production, and optimal resource allocation.
China is already a large industrial country in the world. There are many types and large volumes of wastewater. According to the products and processing objects of industrial enterprises, there are mainly textile printing and dyeing wastewater, metallurgical wastewater, papermaking wastewater, coking wastewater, electroplating wastewater, etc., which flow into industrial wastewater treatment plants. Most of the wastewater is pre-processed, and it belongs to comprehensive industrial wastewater. It has complex components, its potential harm is large, and the cost of advanced treatment is high. Insiders from the media recently focused on Shaoxing area to throw bricks.
In upgrading, we must first consider ensuring the safety of the effluent to the ecology and people.
There are many ways to control its harmfulness. There are three common ways. The first way is to reduce the emission concentration of harmful pollution so that its emissions are controlled within the environmental and personal safety range. The second way is to reduce the total amount of emissions through recycling. The third way is to adjust the production process from Reduce or eliminate emissions of hazardous substances at the source of production.
Shaoxing area implemented low-drainage dyeing and finishing in the printing and dyeing industry. At the same time, they introduced advanced powdered activated carbon new technology, which has a good effluent effect and realized the recycling of activated carbon. This solves the danger of absorbing saturated activated carbon and avoids the large consumption of activated carbon and The old problem of water and pollution.
Secondly, we must consider the environment and economic affordability as a whole, and act within our means.
The environment has a certain self-purification function for pollutants, and it also has a certain capacity. The problem of industrial wastewater treatment is accompanied by industrial development. It is a developing problem. The basis of safety must be considered through development. The environmental and economic bearing capacity must be considered in a unified manner.
Simply talking about the treatment of printing and dyeing wastewater, China is a large country of traditional textile printing and dyeing, and the clothing industry is a dominant industry in China. There are thousands of textile printing and dyeing companies in Shaoxing alone, which provide a large number of jobs and are also the pillar industries of the local economy. In addition, the volume of printing and dyeing wastewater is large, the composition is complex, the deep treatment is difficult, and the treatment cost is high. If we only look at the bearing capacity of the environment and disregard the bearing of the economy, it will lead to a cliff-like fall in the local economy and cause a lot of unemployment. If only economic affordability and competitive advantages of products are considered, environmental affordability will not be considered, and environmental degradation will eventually lead to loss of competitive advantage.
Thirdly, we must face the reality directly, adapt to local conditions, and be forward-looking.
China's industrial enterprises are mainly located in the coastal areas along the river in the east, with a dense population, and the current state of the environment is not optimistic. At the same time, it is also a large economy in China. The upgrading and upgrading of industrial wastewater must face the reality and implement the national rigid requirements. Do not engage in “one size fits all” and take targeted measures according to the current status of different industries to ensure that the environment is gradually improving, avoiding economic ups and downs, and promote industrial transformation and upgrading Get accelerated.
Zhejiang Shaoxing area proposes that industrial enterprises enter the park, and waste water is managed and discharged. In-depth treatment is based on environmental capacity and economic affordability. It is possible to upgrade to Grade A water or Grade III surface water again, the environment is improved, its investment and operating costs can be sustained, the advantages of the textile printing and dyeing industry are maintained, and the wastewater in industrial gathering areas is treated.
Strengthen scientific and technological support, increase research and development and promotion of new technologies.
Many of the advanced industrial wastewater treatment technologies are mostly derived from or borrowed from municipal wastewater treatment technologies. The current state of the environment reminds us that technological support is not enough. Industrial wastewater has its own characteristics such as high concentration, complex composition, and unstable incoming water. A single technology and simple equipment are difficult to achieve. In addition, its treatment cost is directly related to the product's competitive advantage.
In the case of advanced treatment of printing and dyeing wastewater, there are thousands of ingredients with outstanding chromaticity. In the past few years, many companies in the Yangtze River Delta adopted traditional methods, which resulted in large mud production and high costs. Recently, the technology of pushing the film is good, but because of the high cost, the promotion is large, and there are not many large-scale applications. Recently, when the problem of printing and dyeing wastewater was exposed by the media, some places took a large number of shutdowns to respond. The Shaoxing area tried to use the new activated carbon technology jointly developed by Hubei Junji and Wuhan Technology and Business College to establish a large-scale engineering application of 150,000 tons per day. .
Strengthen the disclosure of bidding information and implement market-oriented operations.
The industry has the same feeling. Many bidding and upgrading projects are now called open tenders. In fact, the information is very asymmetric and lacks transparency. It is basically for the circle and the industry. Many market-oriented projects can only be counted as capital operation and lack of sufficient competition, which results in low resource allocation, poor bidding results, and many remaining problems.
At this stage of China's industrial wastewater standardization transformation, whether to promote zero emissions, let time tell everyone!