做工業清洗的都知道，清洗槽里的水用不了幾天就渾了，油污、鐵屑、清洗劑混在一起，直接排掉可惜，處理達標再排又要花一筆污水處理費。尤其是超聲波清洗和噴淋清洗線，水耗不小，一年下來水費和排污費加在一起，不是個小數目。低溫廢水回收設備這幾年在機加工、汽配、五金行業用得多起來，核心邏輯就一個：把清洗廢水里的水和有用成分回收回來，循環使用，減少新鮮水補入和廢水排放。

Those who do industrial cleaning know that the water in the cleaning tank will become turbid in just a few days, with oil stains, iron filings, and cleaning agents mixed together. It's a pity to discharge it directly, and it will cost a sewage treatment fee to treat it up to standard before discharging. Especially for ultrasonic cleaning and spray cleaning lines, the water consumption is not small, and the combined water and sewage fees over the course of a year are not a small amount. Low temperature wastewater recovery equipment has been widely used in the machining, automotive parts, and hardware industries in recent years. The core logic is to recover the water and useful components in the cleaning wastewater, recycle them, and reduce the intake of fresh water and wastewater discharge.

低溫回收的原理，靠的是加熱蒸發而不是膜過濾。 常見的水處理方式有膜過濾、化學沉淀、生化處理，但這些方法對含油、含清洗劑的工業廢水往往力不從心——膜容易堵，化學法產生污泥，生化法對水質波動敏感。低溫廢水回收走的是另一條路：在較低溫度下（一般40到50攝氏度）對廢水進行加熱蒸發，水變成蒸汽后冷凝成蒸餾水回用，油污、清洗劑、金屬鹽類留在濃縮液里定期排出。因為蒸發溫度低，能耗比傳統蒸餾低不少，而且對廢水成分的適應性更寬，不像膜系統那樣嬌氣。

The principle of low-temperature recovery relies on heating evaporation rather than membrane filtration. Common water treatment methods include membrane filtration, chemical precipitation, and biochemical treatment, but these methods are often inadequate for industrial wastewater containing oil and cleaning agents - membranes are prone to clogging, chemical methods produce sludge, and biochemical methods are sensitive to water quality fluctuations. The recycling of low-temperature wastewater follows another path: the wastewater is heated and evaporated at a lower temperature (usually 40 to 50 degrees Celsius), and the water is condensed into distilled water for reuse. Oil stains, cleaning agents, and metal salts are left in the concentrated solution and regularly discharged. Because the evaporation temperature is low, the energy consumption is much lower than traditional distillation, and the adaptability to wastewater components is wider, unlike membrane systems which are delicate.

回收的水能用到什么程度，取決于原水水質和回收工藝。 如果清洗線對水質要求不高，比如粗洗段，回收水直接補回去就行；如果漂洗段要求電導率低，回收水可能還要經過離子交換或者反滲透再處理。選型時要弄清楚兩件事：一是你的廢水里主要含什么，是切削液、防銹油還是清洗劑，成分不同，蒸發濃縮的倍數和排濃縮液的周期也不一樣；二是回收水準備用在哪一段，回用要求越高，后處理環節越多，投資也越大。有些項目買回來發現回收水只能用于沖廁所，和當初設想的“回清洗槽”差距很大，就是前期沒把水質要求對齊。

The extent to which recycled water can be used depends on the quality of the raw water and the recycling process. If the cleaning line does not require high water quality, such as in the coarse washing section, the recycled water can be directly replenished; If the rinsing stage requires low conductivity, the recovered water may also need to undergo ion exchange or reverse osmosis treatment. When selecting a product, two things need to be clarified: first, what is the main content in your wastewater, whether it is cutting fluid, rust proof oil, or cleaning agent? The composition is different, and the evaporation concentration factor and the cycle of discharging the concentration solution are also different; The second is where to reserve the recycling level, the higher the recycling requirements, the more post-processing steps, and the greater the investment. Some projects have found that recycled water can only be used for flushing toilets, which is very different from the originally planned "backwash tank" because the water quality requirements were not aligned in the early stage.

濃縮液怎么處理，是容易被忽略的末端問題。 低溫蒸發把水回收了，剩下的濃縮液里富集了油污和鹽分，量雖然不大，但屬于危廢或者高濃度廢水，不能隨便倒。正規做法是委托有資質的單位處理，或者配套進一步的減量設備。選型時要問清楚濃縮液的產生量和處理建議，把這部分運行成本算進去，不能只算回收水省了多少錢。另外，蒸發器本身也需要定期清洗，換熱面上結垢后效率下降很快，維護周期和清洗方式要提前了解。

How to handle concentrated solution is a terminal issue that is easily overlooked. Low temperature evaporation recovers the water, and the remaining concentrated solution is enriched with oil and salt. Although the amount is not large, it belongs to hazardous waste or high concentration wastewater and cannot be poured casually. The formal practice is to entrust qualified units to handle or provide further reduction equipment. When selecting, it is important to clarify the amount of concentrated liquid produced and treatment suggestions, and include this part of the operating costs, not just how much money is saved by recycling water. In addition, the evaporator itself also needs regular cleaning, and the efficiency decreases quickly after scaling on the heat exchange surface. The maintenance cycle and cleaning method should be understood in advance.

能耗和運行成本，才是判斷值不值得上的關鍵。 低溫蒸發雖然比高溫蒸餾省能，但加熱和冷凝還是耗電或者耗蒸汽。如果廠里有余熱資源，比如空壓機余熱、鍋爐蒸汽冷凝水，用來給蒸發器供熱，運行成本能降一大截。如果沒有余熱，純靠電加熱，就要仔細算算水費、排污費和電費之間的賬。一般來說，廢水排放成本高、新鮮水價格貴的地區，低溫回收的回本周期更短；如果當地水價便宜、排污費低，這套系統的經濟性就要重新評估。

Energy consumption and operating costs are the key to determining whether a value is worth it or not. Although low-temperature evaporation saves energy compared to high-temperature distillation, heating and condensation still consume electricity or steam. If there are waste heat resources in the factory, such as air compressor waste heat and boiler steam condensate, used to supply heat to the evaporator, the operating cost can be greatly reduced. If there is no waste heat and pure electric heating is used, it is necessary to carefully calculate the balance between water, sewage, and electricity bills. Generally speaking, in areas with high wastewater discharge costs and expensive fresh water prices, the payback period for low-temperature recycling is shorter; If the local water price is cheap and the sewage fee is low, the economic viability of this system needs to be reassessed.

低溫廢水回收設備不是萬能的水處理方案，它適合的是含油、含清洗劑、成分復雜但水量不大的工業清洗廢水。把水質、回用要求、濃縮液處理和運行成本這幾件事算清楚，這套設備才能真正幫你省錢。

Low temperature wastewater recovery equipment is not a universal water treatment solution. It is suitable for industrial cleaning wastewater containing oil, cleaning agents, complex components, but small water volume. Only by calculating the water quality, reuse requirements, concentrate treatment, and operating costs clearly can this equipment truly help you save money.

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