Preparation of purified water in clean workshop
Preparation of purified water in clean pharmaceutical cleanroom
Purified water preparation system is mainly divided into 3 parts: pretreatment, post-treatment, water storage and pipeline distribution; pretreatment of raw water can ensure the reliability of purified water system operation and the quality of final water. Maintenance costs and time in processing steps can be reduced, reducing...
Text label: clean workshop, preparation of purified water
Preparation of purified water in clean workshop
Purified water preparation system is mainly divided into 3 parts: pretreatment, post-treatment, water storage and pipeline distribution; pretreatment of raw water can ensure the reliability of purified water system operation and the quality of final water. It can reduce maintenance costs and time in processing steps, reduce impurities and particles, reduce hardness and metals, control the growth of microorganisms, reduce organic matter and biological impurities; for the preparation of purified water for medicinal purposes, a post-treatment system should be used, alone or in combination. Various processing equipment, such as ion exchange, secondary reverse osmosis, electron dissociation and ultraviolet light; the purified water tank is made of 304 stainless steel, the inner wall is electropolished and passivated, and the pipeline is made of 304 stainless steel, and the inner wall is electropolished and passivated For chemical treatment, the valve adopts stainless steel diaphragm valve, sanitary quick-fit joint, the pipeline adopts circulation arrangement, the return water flows into the storage tank, and the pipeline is regularly disinfected.
Multimedia filter, the filter media is filled with different diameters of quartz sand in layers, the larger diameter media is usually located at the top of the filter, and the water flows through the gradually finer media layers from top to bottom. The porosity should allow the removal of particles with a minimum size of 10-40 μm. The media bed is mainly used to filter and remove large particles in the raw water, such as suspended solids, colloids and sediment, to reduce the impact of raw water turbidity on the membrane system and reduce the SDI value. , effluent turbidity < 1, SDI < 5, which meets the water inlet requirements of the reverse osmosis system. According to the water quality of the raw water, it is sometimes necessary to add flocculants in the inlet pipe and adopt the direct current coagulation method to make most of the suspended solids and colloids in the water. It becomes micro-floc and is trapped in the green layer of the multi-media and removed; according to the increase of the pressure difference and the passage of time, the deposited particles can be removed by backwashing operation, and the backwashing can also reduce the pressure of the filter, generally In this case, clean raw water can be used for the reverse flushing solution, usually at a flow rate of 3-10 times the design flow rate for about 30 minutes. After the reverse flushing, a short forward flushing is performed in the direction of the operating flow to reset the medium. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for purification workshops and clean workshops.
Activated carbon filter is mainly used to remove free chlorine, microorganisms, colored, organic matter and some heavy metals in water to prevent them from affecting the reverse osmosis membrane system. The filter medium is usually composed of granular activated carbon to form a fixed layer; the growth of microorganisms is a key consideration. This occurs because of the large internal surface area of u200bu200bthe filter and the relatively low flow rate. At the same time, the filter medium is also a breeding ground for bacteria. Since the activated carbon filter will retain most of the organic matter and impurities, etc., It is adsorbed on the surface, so regular pasteurization can be used to ensure the adsorption of activated carbon. Microfiltration is a membrane process for removing fine particles and microorganisms. In the microfiltration process, no waste water flow is generated. If the size of the filter element is the same, the shell of the microporous filter can pass through, but the material and pore size of the filter element are different. , in the final filter, the pore size is usually 0.04-0.45 μm. Microporous filters are generally used for the retention of microorganisms after some components in pure water systems, and there may be growth of microorganisms. The effect of microporous filters in this area is very obvious, but appropriate operating steps must be taken to ensure installation and The integrity of the filter in the process of replacing the membrane is to ensure its inherent performance; the microporous filter is suitable for the intermediate process of the purified water preparation system, not suitable for the circulation distribution system.
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