Customer Profile: Dongguan De * Wu Electric Appliance Co., Ltd. is an Italian funded enterprise specializing in the design and manufacturing of high-end household appliances, listed in Milan, Italy under Delonghi Group. Delonghi Group, as a publicly listed company controlled by an Italian family, originated the Delonghi brand in the early 20th century. Dongguan De * Wu Electric Appliance Co., Ltd. is the largest overseas factory of Delong Group, with nearly 2000 employees currently. The annual export value exceeds HKD 1.5 billion, making it an important production force for household appliances in the world.
Project Name Enterprise: De * Wu Co., Ltd.
Project Name: De * Reclaimed Water Reuse ProjectOperating time: 2024
Main process: low-temperature evaporation - multi-media filter - ultrafiltration - first stage RO - second stage RO - pure water reuse
Treatment standard: the conductivity of reclaimed water is less than 20 μ s/cm
Project features: pre evaporation, minimal interference with raw water quality fluctuations, stable water production, and zero emissions
Project scale: 50T/D low-temperature evaporation equipment+reclaimed water reuse
Through water sample experiments, the characteristics of wastewater quality in this project were analyzed:
Heavy metal content: The concentration of copper ions in wastewater is about 30-50mg/L, the concentration of nickel ions is 10-20mg/L, and the concentration of lead ions is 5-10mg/L.
Organic concentration: The chemical oxygen demand (COD) can reach 800-1200mg/L, mainly due to various organic chemicals used in the production process.
PH value: The pH value fluctuates greatly, ranging from 2-11, showing strong acidity or strong alkalinity.
Dissolved salts: The total dissolved solids (TDS) content is about 3000-5000mg/L, which contains a large amount of sodium chloride, sodium sulfate, etc.
Based on its characteristics, we have designed a low-temperature evaporation multi-media filter ultrafiltration first stage RO second stage RO pure water reuse treatment process for it.
The specific process is as follows:
Firstly, for high concentrations of organic matter and some heavy metals in wastewater, low-temperature evaporation technology can evaporate water at lower temperatures, effectively concentrate pollutants in wastewater, reduce the amount and load of subsequent treatment, and avoid the impact of high temperatures on certain heat sensitive substances, thereby reducing energy consumption and equipment scaling risks.
Secondly, through a multi-media filter, residual suspended solids, colloidal substances, and some large molecular organic compounds in the wastewater are removed, providing good inlet water quality for subsequent ultrafiltration and reverse osmosis treatments and preventing membrane fouling.
By using ultrafiltration membrane again, the large molecular organic matter, colloids, bacteria, and some viruses in the wastewater are further intercepted, effectively protecting the reverse osmosis membrane from pollution and blockage, extending the service life of the reverse osmosis membrane, and further reducing the turbidity and organic content of the wastewater.
Then we come to the core stage, using a first stage RO and a second stage RO, under pressure, almost all dissolved salts, heavy metal ions, small molecule organic compounds and other pollutants in the wastewater can be removed. The first stage RO can remove most of the pollutants, while the second stage RO further concentrates the concentrated water from the first stage RO, reducing the load on the evaporator and lowering construction costs.
This process has many advantages, such as good water quality, and low-temperature evaporation at 30 ℃ can control COD and ammonia nitrogen in a lower range; Good reuse effect, pure physical purification, no chemical additives, more conducive to the reuse of produced water; 24/7 unmanned operation, PLC controllable programming+remote wireless monitoring to achieve 24-hour fully automatic operation.
New energy
