Impact data of circulating water equipment for car washing
2. Environmental pollution: the content of LAS in the car wash wastewater is only between 5 mg/L and 30 mg/L, and the net pollutant of LAS is17.5 mg/L. After being diluted to the water content of 14595 tons of national secondary discharge standard, five gorge reservoirs (Shanxia Reservoir) will be exhausted. The water capacity of 1043 West Lake was used.
3, the state attaches great importance to, condensed the knowledge of the whole people; Governments at all levels actively responded and put them into action. With the deterioration of water resources and environmental conditions all over the country, the waste of car wash water has attracted people's attention all over the country.
As early as 2007, the National Development and Reform Commission took "car washing circulating water equipment" as a catalogue of environmentally friendly products to encourage development. It is enough to prove that the state attaches great importance to the problem of washing cars and wasting water. The provincial capitals and economically developed cities in China have successively issued "water saving management orders" to strengthen the relevant laws, regulations, policies and legislation on water management for car washing, and set off a nationwide upsurge of "renovating waste water in car washing stations". People all over the country responded enthusiastically to this action and expressed their support for the rectification action in different actions and ways. The problem of wasting water resources in car washes needs to be rectified urgently, which has been highly recognized by the government and the people of the whole country.
As a result, there was a nationwide "car wash rectification action". Won the support and response of the people of the whole country. According to local reports, good results have been achieved; Its data is methodical and detailed. If so, it will be a blessing to the country.
4. Rectify the embarrassment encountered in the action of washing the car and wasting water.
Why did the nationwide campaign to clean up car wash wastewater encounter the same embarrassment? All over the country, all kinds of media always see articles and reports with almost the same title, "Why is it difficult to recycle car wash circulating water?" . So there are all kinds of questions and explanations; Then a law enforcement and response hide-and-seek game was staged!
Who is to blame? Whose fault is this? Law enforcers and owners are not at fault! In fact, the deep-seated reason for enforcing the law and dealing with the hide-and-seek game caused by "why it is difficult to recycle the car wash circulating water" is "car wash circulating water equipment"!
As long as people who have been exposed to car washing know, there are a lot of circulating water after circulating water treatment, and almost all of them have foam and smelly water, which is an indisputable fact. Therefore, it is difficult for car owners to accept that car wash owners dare to go against God's will for their livelihood. So the master became the culprit? The smelly washing car will directly affect the owner's own quality of life and life safety. How dare he ignore it? In this way, there have been a lot of embarrassment!
Five, "circulating water is difficult to circulate" circulating water equipment technical analysis
The main impurities and pollutants in car wash wastewater are soluble substances such as oil, sediment, surfactant and bacteria. Of course, the treatment process of car wash water should be targeted, effective and feasible.
1, oil pollution and sediment treatment. At present, all the process equipment in the world can basically solve this problem; Only the solutions are good and bad, and the solutions are different. If it is not solved well, it will often block the equipment. This treated water is basically clear and transparent, just like tap water. Judging from the overall treatment process of most circulating water equipment at present, only the treatment process of car wash water has been completed.
2. The treatment of soluble oil stains, surfactants, bacteria and other soluble substances in car wash water is the key to whether the circulating water equipment can be recycled. The problems of foam and water odor in circulating water are caused by this. So the whole process must be designed around this problem.
3. Analysis of several treatment methods:
A quartz sand for filtration and activated carbon for adsorption of multi-media filter. Filter materials such as quartz sand can filter out mud, sand, rust, oil and so on. In the water; Activated carbon is used to adsorb and remove various odors, colors, detergents and soaps in water, but it remains in the system all the time. Precision filter can filter out mud, sand, rust, oil and other residues in water, thus ensuring the final effluent quality; However, this process requires frequent backwashing, and activated carbon needs to be regenerated or replaced after a period of use (the volume of activated carbon in the current equipment is 7- 15 days). The high cost is unbearable.
B, adopting biochemical method and biofilm method; It is technically feasible. Biological method is the most "wave" treatment method in water treatment, which requires waterfalls and "waves" and has a long and "flooding" residence time. To meet the requirements, there must be enough space to ensure the biochemical time, and the nutritional components of car wash water are not enough to meet the biochemical requirements.
C membrane filtration method: membrane filtration requires high water quality and high water pressure. In membrane filtration, except reverse osmosis membrane and nanofiltration membrane, other membranes can not remove LAS components. However, the requirements of reverse osmosis membrane and nanofiltration membrane for water pressure and maintenance cost are unrealistic in economy. However, ultrafiltration membrane is usually used for low-grade water treatment and cannot filter most pollutants dissolved in water.
D. Photocatalytic oxidation method: Photocatalytic oxidation technology is a new technology and method developed in 1970s and recent thirty years. Previously, due to the limitation of the loading and distribution of photocatalyst in the system, the quantum efficiency of photocatalytic oxidation technology is low, and the photogenerated electron-energy gap pair is easy to recombine, so the technology has not really been industrialized. Relevant data show that the process has made a major breakthrough.
Successful catalyst modification: TiO2 catalyst was modified by ion doping, which solved the problems of low quantum efficiency and easy recombination of photogenerated electron-energy gap pairs in photocatalytic oxidation technology. The problem of selectivity of catalyst to pollutants is solved. Through the three-dimensional network immobilization technology of catalyst and the reasonable distribution of light sources, the reactor formed a uniform and equivalent fusion of light and catalyst. So as to realize the industrial application of the technology.
The process of circulating water equipment is divided into two steps: the first step: the collected car wash wastewater is precipitated, and then the water purifier is added for coagulation, precipitation and clarification. The water treated in the first step is already clear and transparent. Step 2: Under the catalysis of photocatalyst, clean water is decomposed into foam by photocatalytic oxidation and smelly substances by ultraviolet lamp, and then sterilized, disinfected and deodorized. The water treated in the second step is colorless, odorless and foam-free, and can be reused. This process equipment is the most successful circulating water equipment for car washing in the world at present.
Only from the above various car wash water treatment processes, "quartz sand filtration, activated carbon adsorption multi-media filter" is adopted.
"Biochemical method and biofilm method" and "membrane filtration method" are all effective from the technical point of view, and they are all targeted and effective; Therefore, there is a lack of evaluation of the feasibility and practical operability of such equipment in the recommendation evaluation of relevant government functional departments in major cities across the country. Thus, the "source of embarrassment" was born!
Six, embarrassing "car wash action" several major achievements:
1, car wash owners are the biggest beneficiaries: in other words, "action" is a reward for irresponsible water wasters and environmental destroyers. Because the price of car washing nationwide is basically around 5 yuan.
2. The main reason for the car wash is the biggest profiteer: simple accounting: the formal investment in circulating water equipment and auxiliary projects is below 25,000.00 yuan (some owners only spend 2-3,000 yuan to buy simple filters for inspection). If 5 yuan is added to each train, 80 cars are washed every day (many cars are washed every day 100), and 400 yuan is charged every day. Recover the investment in less than 3 months (buy 2-3 thousand yuan of equipment, and recover it in a few days? )。 Doesn't the host steal the fun?
3. The action of transforming the car wash station has caused greater waste of water resources: the owner of the car wash station overcharged the car owner and washed the car cleaner, so he used more water to reassure the car owner. If circulating water can't be used, of course, tap water should be used more. Because the cost of car washing is very small. 100 litres of water costs less than 1 yuan (according to the Shenzhen water price of 7.5 yuan +2 1 yuan, the water cost of car washing in developed cities such as Shenzhen is 0.5 yuan, because the car washer is skilled, and the average car washer is up to 50 litres of water).
Car owners are the biggest and most innocent victims: they support environmental protection, and they are willing to pay sincere attention to protecting and saving the water resources on which we depend. However, their sincerity was trampled by greedy people. Because they are the last to pay the bill. If the environment is destroyed, the people who pay the bill will suffer.
5, breeding corruption, some water pipe grass-roots staff, the general trend to recommend unqualified manufacturers' products with interest rebates, arbitrarily making things difficult for other qualified products; And arrange all licenses; Profit from it.
Seven, why it is difficult to circulate the car wash circulating water.
1, the first problem is the treatment effect of circulating water equipment, which leads to the chaotic situation of circulating water market. Without good equipment, the premise of carrying out circulating water car washing is not established.
2. The local government itself does not know enough about the rectification actions. Conceptually, I didn't realize that circulating water car washing is not only related to the cost of car washing industry, but also related to the ecological environment of a city, the basic functions of the whole city and the guarantee mechanism for the normal operation of various industries in case of water shortage.
3. The action of transforming the car wash was not fully prepared, and the recommended equipment was not fully and scientifically demonstrated. Its demonstration must be based on the pollutant characteristics of car wash wastewater, and its equipment treatment process must have a comprehensive evaluation of pertinence, effectiveness and feasibility. Lack of any one aspect is not feasible. If there is no suitable circulating water equipment, the effluent of the equipment can not meet the water quality required for recycling. What do you want the car wash industry to do? Carrying out the "renovation of car wash" in such a hurry will not only fail to achieve the renovation effect, but will be a disaster that will affect the government's reputation.
4. The government's role is misplaced: the government can only be the policy maker and the policy executor, and it can never be the recommender of circulating water equipment without comprehensive evaluation and demonstration of its feasibility from three aspects: pertinence, effectiveness and feasibility. Resulting in insufficient equipment treatment effect. Who is to blame? How does your government enforce the law?
5. Some well-known universities and chemical research institutes in China introduced inferior equipment, which caused the trust crisis of circulating water equipment in car wash rectification.
6. Lack of standards; There is only the water quality standard of recycled water, but there is no qualified equipment process certification standard.
Eight, how can we make the car wash circulating water really circulate?
How can we make the car wash circulating water really circulate? The key problem is to solve the problem of circulating water equipment for car washing. Only when the water treated by the circulating water equipment for car washing can really meet the requirements of car washing water, and there is no odor, residual surfactant and other pollutants, can people accept it calmly. Only the owner accepts that the business of the car wash will not be affected by the use of circulating water, which is the day when the circulating water really circulates.
It has been ten years since the earliest provinces and cities launched such actions. In the provinces and cities where governments all over the country carry out large-scale car wash water rectification actions, the shortest time is 2-3 years. I don't believe this. In such a big China and such a developed era of science, there is no way to treat car wash water? No set of equipment can meet the water recycling of car washing? It's a slippery world!
Therefore, what the government should do is not only to establish a long-term governance mechanism in policy, but more importantly, to advocate and encourage domestic scientific research institutes, environmental protection institutions and individuals to use advanced technology to develop and improve the treatment and reuse process of car wash wastewater. Reward units and personnel who have made major breakthroughs in related technologies and process equipment to fill this gap. As domestic universities and research institutes, they should shoulder this heavy responsibility.