As smartphones are updated annually and computers every three years, the electronic waste being discarded is piling up and becoming an "invisible burden" for the Earth. Among these, waste circuit boards pose the greatest challenge — they are like a "mixture of treasure and poison": each ton of circuit boards contains about 200 grams of gold, 1,000 grams of silver, and 30 kilograms of copper, with a value comparable to that of "urban mines". However, they also contain toxic substances such as lead and mercury. If they are randomly disassembled or incinerated, they will pollute the soil and air. How can this "contradictory entity" be transformed into a valuable resource? Water-based recycling equipment for waste circuit boards is the "green key" to solving this challenge. The core logic of this equipment is to use the most simple "water" as a separation medium to achieve precise extraction of resources. Its working process is like an "environmental magic": first, the waste circuit boards are disassembled to remove components such as capacitors and chips; then, they are crushed into millimeter-sized mixed particles; finally, these particles enter the water-based separation system — using the density difference between metals and non-metals (plastics and resins), the water flow will act like an "intelligent sieve", allowing dense metal particles to settle to the bottom, while light non-metallic particles will float away with the water flow. The separated metals can be further purified into industrial raw materials; non-metallic materials can also be processed into construction fillers or plastic particles, truly achieving "full utilization". Compared with traditional incineration and chemical extraction methods, the advantages of water-based recycling are obvious. Incineration will release toxic fumes, and chemical methods are prone to generating heavy metal wastewater, while the water-based separation process has almost no secondary pollution — the recycled water system can increase water resource utilization rate to more than 95%, saving costs and protecting the ecology. More importantly, its recycling efficiency is amazing: a medium-sized equipment can process more than 10 tons of waste circuit boards per day with a recovery rate of more than 90%, equivalent to extracting real gold and silver from "garbage", creating considerable economic benefits for enterprises. In a circular economy industrial park in Jiangsu, this equipment has become a "star product". The park manager introduced that after the introduction of the equipment, more than 3,000 tons of waste circuit boards are processed annually, with 180 tons of copper, 12 kilograms of gold, and 600 kilograms of silver recovered, not only generating millions of yuan in revenue for enterprises, but also reducing nearly 100 tons of toxic substance emissions. Local villagers said with a smile: "In the past, small workshops near here disassembled circuit boards, and the smell was pungent; now the industrial park is clean and has created many jobs." The popularity of this equipment is in line with the country's "carbon dioxide reduction and carbon neutrality" goals and circular economy strategy. It is clearly proposed to "improve the recycling and utilization level of electronic waste", and water-based recycling technology is the "implementation tool" of this plan. It transforms the "linear economy" into the "circular economy", turns "resource consumption" into "resource regeneration", and opens up a green path for electronic waste treatment. The water-based recycling equipment for waste circuit boards is not just a machine, but also a vivid example of technology empowering environmental protection. It tells us: to solve environmental problems, we don't have to rely on "one-size-fits-all" prohibitions, but can find a "balance" with innovative technologies — so that resources are not wasted and the environment is not damaged. As more and more such equipment enter factories, we are one step closer to the dream of a "waste-free city"; and one step closer to a future where humans and nature coexist in harmony. （Word count: about 850 words）