1. Core cost: Energy consumption cost. This is the highest proportion of the operating cost of the low-temperature evaporator (approximately 50% to 70% of the total operating cost), mainly consuming two types of energy: electric energy consumption

Core power-consuming equipment: vacuum pump, circulating pump, heat pump compressor, and electronic control system, among which the heat pump compressor and vacuum pump are the main power consumers;

Cost calculation: Based on equipment power (for example, the power of a 10m³/d processing equipment is approximately 15~25kW), local industrial electricity price (approximately 0.6~1.2 yuan/kWh), and average daily operation duration (24 hours of continuous operation), the daily electricity consumption cost can be estimated;

Energy-saving advantage: Compared to traditional evaporators (electric heating/steam heating), low-temperature evaporators paired with a heat pump system can recover condensation heat, reducing energy consumption by 60% to 80%.

Auxiliary energy consumption (for some equipment)

A few devices are equipped with steam-assisted heating (for high-concentration, hard-to-evaporate wastewater), and the cost of steam procurement needs to be calculated;

Cooling water consumption: If a water-cooled condenser is used, circulating cooling water needs to be replenished, resulting in a small amount of water expenses.

II. Fixed costs: To ensure stable operation of the equipment and prevent scaling and blockage, consumables and chemicals need to be added and replaced regularly: chemical cost

Scale inhibitor: Prevents calcium and magnesium ions from scaling on heat exchange surfaces. It is added according to the hardness of the wastewater, with a chemical cost of about 0.5~2 yuan per ton of wastewater;

Corrosion inhibitor: For high-salt and acidic wastewater, it protects metal parts of equipment, with a cost of about 0.3~1 yuan per ton of wastewater;

Cleaning agent: Used during regular chemical cleaning (citric acid, specialized cleaning agent), with a cost of approximately 500~2000 yuan per cleaning session, and cleaning once a month or quarterly.

Consumable replacement cost

Filter consumables: pre-filter screen at the water inlet, PP cotton filter cartridge, replaced 1-2 times per month, with a cost of about 50-200 yuan per replacement;

Seals: Sealing rings and gaskets for pipelines and valves need to be replaced regularly due to aging and leakage. The cost per replacement is approximately 100 to 500 yuan, and they are replaced every 3 to 6 months.

III. Maintenance Costs: Costs for Replacing and Overhauling Accessories, Costs for Replacing Wear-and-Tear Parts

Pump components: Impellers and bearings of vacuum pumps and circulating pumps need to be replaced when worn out. The cost per replacement is approximately 1,000 to 5,000 yuan, and the service life is about 1 to 2 years;

Heat exchanger tube/plate: If corrosion or damage occurs, partial replacement is required, which incurs high costs (approximately 5,000 to 20,000 yuan) and has a service life of approximately 3 to 5 years (related to the corrosivity of the wastewater).

Regular maintenance cost

It is necessary to hire manufacturers or professionals for a comprehensive inspection (including vacuum system leak detection and heat pump energy efficiency testing) once a year, with a cost of approximately 2,000 to 5,000 yuan per inspection;

If the equipment malfunctions and needs to be shut down for maintenance, additional costs for parts and labor will be incurred.

IV. Daily Operation Labor Cost: 1~2 operators are required to be assigned to be responsible for equipment start-stop, parameter monitoring, liquid level inspection, and consumable replacement, calculated based on local industrial labor costs (approximately 3000~6000 yuan/person/month);

Labor cost for maintenance: If the enterprise completes the cleaning and maintenance work on its own, the labor cost of technical personnel should be included; if outsourced to a third party, an outsourcing service fee (approximately 1000~3000 yuan per instance) should be paid.

V. Hidden Costs: Subsequent Wastewater Disposal Costs The core function of a low-temperature evaporator is concentration and reduction (the volume of treated wastewater can be reduced by 80% to 95%), but the concentrated liquid still needs to be disposed of in compliance with regulations, incurring corresponding costs: Outsourced disposal of concentrated liquid: If the enterprise does not have self-disposal qualifications, it needs to entrust a hazardous waste disposal company for transportation and disposal, with a cost of approximately 2,000 to 5,000 yuan per ton (specifically priced according to the hazardous waste category of the concentrated liquid);

Resource recovery cost: If the concentrated solution contains precious metals or high-value salts, the cost invested in purification and recovery (such as nickel recovery from electroplating wastewater) can offset part of the disposal cost.

A cost optimization tip: Prioritize the selection of heat pump-type low-temperature evaporators to reduce electric energy consumption;

Conduct proper water intake pretreatment (filtration, neutralization) to reduce scaling and equipment corrosion, thereby extending the service life of components;

Conduct resource recovery on concentrated liquid (such as salt crystal recovery and heavy metal extraction), turning waste into treasure and reducing disposal costs.