1、 Chemical industry: solving the problem of high salt and high COD wastewater treatment

In the production processes of reaction, distillation, and extraction in the chemical industry, a large amount of high salt, high COD (chemical oxygen demand), and difficult to degrade organic matter containing wastewater is generated. This type of wastewater is complex in composition, highly toxic, and traditional biochemical treatment techniques are difficult to meet standards, and can easily cause equipment corrosion.

The application logic of a low-temperature evaporator in this scenario is to use a vacuum low-temperature environment (40-70 ℃) to heat the wastewater to its boiling point and evaporate it. The water vapor condenses to form standard effluent, while the salt and organic pollutants in the wastewater are separated in concentrated liquid or crystalline form. For example, when a coal chemical enterprise is treating high salt wastewater containing phenol, the low-temperature evaporator can reduce the COD of the wastewater from 5000mg/L to below 50mg/L, the salt content from 20% to below 0.1%, and the effluent can be directly reused in the circulating cooling system; After further purification, the separated salt crystals can be reused as industrial raw materials in production, achieving the circular transformation of "wastewater resources".

In addition, intermittent production in the chemical industry can lead to fluctuations in wastewater discharge. The modular design of low-temperature evaporators allows for flexible adjustment of treatment capacity (ranging from 0.5 tons/day to 100 tons/day for a single device), adapting to the wastewater treatment needs of different production cycles and avoiding problems such as idle equipment or insufficient treatment capacity.

2、 Electroplating industry: realizing the resource recycling of heavy metal wastewater

The electroplating industry produces high salt wastewater containing heavy metal ions (such as Cr ³ ⁺, Ni ² ⁺, Zn ² ⁺) in processes such as chrome plating, nickel plating, and zinc plating. If this type of wastewater is directly discharged, it will cause heavy metal pollution in soil and water bodies. The sludge produced by traditional chemical precipitation methods is hazardous waste, with high disposal costs and inability to recover resources.

The key application of low-temperature evaporators lies in "heavy metal separation+water resource reuse": in the low-temperature environment of 50-80 ℃, heavy metal ions will not evaporate with water vapor during the wastewater evaporation process, but remain in the concentrated solution. After subsequent crystallization and separation, heavy metal salt crystals (such as nickel sulfate and chromium chloride) can be formed, with a purity of over 95%, which can be reused for electroplating tank solution preparation; The heavy metal content in the condensed water is less than 0.01mg/L, far below the requirements of the "Emission Standards for Electroplating Pollutants" (GB 21900-2008), and can be directly used for pre-treatment and cleaning of plated parts.

Taking a medium-sized electroplating plant as an example, it generates 20 tons of high salt wastewater containing nickel per day. After treatment with a low-temperature evaporator, 18 tons of recycled water can be recovered per day, reducing fresh water consumption by 6570 tons per year; The value of recycled nickel sulfate crystals is about 80000 yuan/year, and the amount of hazardous waste sludge generated has decreased from 5 tons/month to 0.3 tons/month, reducing the cost of hazardous waste disposal by 94%.

3、 Mechanical processing industry: solving pain points in the treatment of oily emulsified wastewater

The cutting, grinding, and cleaning processes in mechanical processing generate a large amount of oily emulsion wastewater (such as cutting fluid wastewater and emulsion wastewater). This type of wastewater has a high oil content (usually 1000-5000mg/L), strong emulsion stability, low efficiency of traditional demulsification+air flotation treatment technology, and is prone to secondary pollution. Direct discharge can lead to eutrophication of water bodies.

The advantage of low-temperature evaporator for treating oily emulsified wastewater is that the low-temperature environment (30-60 ℃) can avoid high-temperature oxidation and deterioration of oil, while achieving efficient separation of "water oil impurities" through vacuum evaporation. The specific process is as follows: oily wastewater is first pretreated to remove large particle impurities, and then enters a low-temperature evaporator. The water evaporates to form condensed water (with an oil content of less than 10mg/L, which can be reused or discharged), while the oil and impurities remain in the concentrated liquid. After further separation, the oil can be reused for cutting fluid preparation, and impurities are disposed of as hazardous waste in small amounts.

A certain automotive parts processing plant uses a low-temperature evaporator to treat 15 tons of cutting fluid wastewater per day. After treatment, the oil content in the effluent remains stable at below 5mg/L and is reused in the cleaning process, saving 220000 yuan in water costs annually; The recycled mineral oil is about 1.2 tons/month, which can save procurement costs of 150000 yuan/year after being re blended into cutting fluid, with an overall investment return period of only 14 months.

4、 Pharmaceutical industry: Ensuring the safety of high concentration organic wastewater treatment

In the fermentation, extraction, and synthesis processes of the pharmaceutical industry, high concentration organic wastewater (such as antibiotic fermentation wastewater and traditional Chinese medicine extraction wastewater) is generated. This type of wastewater has high COD (usually 10000-50000mg/L), contains biologically toxic substances, and some components are sensitive to temperature. Traditional high-temperature treatment can easily lead to the decomposition of organic matter and the production of harmful gases, posing a safety hazard.

The low-temperature operating characteristics of the low-temperature evaporator (40-70 ℃) are perfectly adapted to the needs of this type of wastewater treatment: on the one hand, the low-temperature environment can avoid the decomposition of organic substances and ensure the safety of the treatment process; On the other hand, the volume of wastewater is reduced by more than 90% through evaporation concentration, and the concentrated solution meets the standard after incineration or advanced oxidation treatment, significantly reducing the cost of subsequent treatment. For example, when a certain antibiotic production enterprise is treating fermentation wastewater, the low-temperature evaporator concentrates the COD of the wastewater from 35000mg/L to 350000 mg/L. The volume of the concentrate is only 10% of the original wastewater, and the subsequent incineration treatment capacity is reduced by 90%. At the same time, the COD of the condensed water is reduced to below 300mg/L. After biochemical treatment, it can meet the discharge standards.

In addition, the pharmaceutical industry has high hygiene standards for wastewater treatment. The low-temperature evaporator adopts a fully enclosed stainless steel chamber design to avoid pollution caused by wastewater contact with the outside world, which complies with GMP (Good Manufacturing Practice) requirements and ensures the hygiene and safety of the treatment process.

5、 Food processing industry: realizing the resource utilization of high sugar and high concentration wastewater

The processes of sugar production, brewing, and juice processing in food processing generate high sugar and high concentration organic wastewater (such as molasses wastewater, beer wastewater, and juice concentration wastewater). These types of wastewater have high COD (5000-20000mg/L) and strong biodegradability, but direct discharge can cause oxygen deficiency in the water body. Traditional biochemical treatment requires a large area and a long treatment cycle.

The core value of low-temperature evaporators in this scenario is "wastewater reduction+reclaimed water reuse": in a low-temperature environment of 50-80 ℃, after wastewater evaporation, the COD of condensed water can be reduced to below 200mg/L, and the SS (suspended solids) can be below 5mg/L, which can be directly used for workshop floor cleaning, equipment cooling, or green irrigation; The concentrated liquid is rich in sugars, organic matter, etc., which can be used as feed additives or through anaerobic fermentation to produce biogas, achieving secondary utilization of resources.

A sugar factory produces 50 tons of molasses wastewater per day. After being treated with a low-temperature evaporator, 45 tons of reclaimed water can be recycled per day for the cooling system, saving 650000 yuan in water bills annually; The concentrated liquid is processed into feed syrup, with an annual sales revenue of 300000 yuan. At the same time, it reduces the footprint of the biochemical treatment tank by 60%, solving the problem of limited space in traditional treatment processes.