Q
How to reduce the dissolved oxygen concentration in ultrapure water?
A
Ultra-pure water typically requires a dissolved oxygen (DO) concentration of 10 ppb, while semiconductor high-end processes demand a concentration of less than 1 ppb. The preferred choice is hollow fiber degassing membranes (membrane contactors), which are the most mainstream solution for industrial ultra-pure water.
Q
What gases can be separated using a degassing membrane?
A
The degassing membrane (membrane contactor) can separate dissolved gases such as oxygen, carbon dioxide, nitrogen, ammonia, hydrogen sulfide, and some volatile organic compounds from water. Ionized substances cannot pass through the membrane and need to be converted into molecular gases before they can be separated.
Q
How to extract ammonia with high purity from high ammonia nitrogen wastewater?
A
Ammonia removal membranes can be used to separate and purify ammonia under alkaline conditions, which can then be reused in production.
Q
What are the requirements for the inlet water quality parameters of the degassing membrane?
A
Inlet water temperature: 5-40℃, surface tension: ≥65mN/m, SS: ≤1ppm, COD: ≤50 ppm, inlet water pressure: ≤0.6 MPa, ORP: ≤100, no strong oxidizing substances such as hydrogen peroxide or hypochlorous acid, oil content: ≤3mg/L.
Q
What material is the degassing membrane element generally made of?
A
The membrane fiber material of the degassing membrane element is generally modified PP, and the membrane shell material can usually be PP, UPVC, SS304, etc
Q
What are the advantages of membrane deaerators at room temperature compared to thermal deaerators?
A
Under the same accounting conditions, the operating cost per ton of water for a 158℃ thermal deaerator is 1.48 yuan, requiring a large amount of high-temperature steam. On the other hand, a room temperature membrane deaerator only consumes electricity and nitrogen, with an operating cost per ton of water of only 0.13 yuan. Since it operates at room temperature without the need for steam, its operating cost advantage is evident.
Q
Does a low-temperature evaporator require steam, gas, or other heat sources, as well as cooling water?
A
The low-temperature evaporator does not require steam, gas, or other heat sources, nor does it need cooling water. It can operate solely with electricity, compressed air, and tap water.
Q
How can waste acid recovery be achieved through low-temperature evaporation?
A
Special materials are used to evaporate the acid from waste acid, achieving the purpose of collecting high-purity acid. The metal ions and other impurities in the waste acid are retained in the concentrated solution, and even the residue is dried into crystals.
Q
What organic solvents can be separated and purified by the supergravity distillation equipment?
A
The supergravity distillation equipment can purify and separate mixtures such as methanol-water, ethanol-water, acetone-water, DMAC-water, DMF-water, ethyl acetate-water, methanol-tert-butanol, dichloromethane-water, triethylamine-water, THF-methanol-water, etc. It can also treat aniline wastewater and phenol wastewater, extract bromine from brine, strip hydrogen chloride, recover iodine from wastewater and wet-process phosphoric acid, strip ammonia water in deoxygenation of power plant flue gas denitrification, and perform water deoxygenation.
Q
What are the treatment processes for high-salt wastewater and refractory wastewater?
A
High-salt wastewater and refractory wastewater can be treated using evaporation processes, with steam compression technology, multi-effect evaporation technology, and low-temperature heat pump evaporation technology being selected according to different usage environments.
