Solid-liquid separation technology is one of the key technologies for developing national economy at the end of last century and the beginning of this century.

Solid-liquid separation technology is one of the key technologies for developing national economy at the end of last century and the beginning of this century. And the development of solid-liquid separation equipment has provided mankind with colorful industrial products. This paper gives an overview of solid-liquid separation equipment. A brief review of the current status of the manufacturing industry of solid-liquid separation equipment and an overview of the research and development of solid-liquid separation equipment. According to the characteristics of today's industrial development, the advantages and disadvantages of several different liquid-solid separation equipment are briefly explained.

1. Introduction of solid-liquid separation equipment
1)The current situation and development trend of solid-liquid separation equipment
With the continuous development of science and technology, Solid-liquid separation equipment in the form of structure, separation efficiency, the level of automation, functional integration, product quality and reliability of the rapid development of the product performance gap with the European developed countries is becoming smaller and smaller, in recent years its application in the pharmaceutical industry has been widely. Many requirements Solid-liquid separation equipment in the slurry of solid particles are very fine particle size. And there is a growing trend of fine, and the general trend is to require high clarity of the filtrate and low moisture content of the filter residue, in order to reduce the workload of drying and further processing, reduce the cost of solid-liquid separation. The prominent object is the dewatering of industrial wastewater, municipal sewage and sludge, the concentration of this slurry is very thin (0.3% to 1.0%), and it should be concentrated to 3% to 10% first, and then pre-dewatering, which can be concentrated from 1% to 5% to 18% to 40%, and then secondary dewatering by vacuum filtration, press filtration, centrifuges, etc. This makes the solid-liquid separation equipment technology faces unprecedented challenges, and at the same time also prompted the entire solid-liquid separation equipment technology and equipment around these challenges and rapid development.
Meanwhile, based on the research, digestion and absorption of similar products at home and abroad, Solid-liquid separation equipment has been widely used in the printing and dyeing industry for the common problems of such products and the characteristics and requirements of domestic sludge dewatering, and has been designed and manufactured by itself as a new type of high-efficiency and continuous operation pressure-type solid-liquid separation equipment with advanced level.

2)Overview of solid-liquid separation equipment
Solid-liquid separation is the process of removing suspended solids from water or wastewater. Solids are generally removed from wastewater by sieving or precipitation methods. Separation methods used in sludge treatment are gravity thickening of sludge, flotation of sludge or mechanical dewatering of sludge. There are microfiltration, clarification and deep bed filtration methods in water treatment. The process of separating solids from liquids is all solid-liquid separation, and there are very many methods, sedimentation, filtration, membrane filtration, press filtration, vacuum, and centrifuge solid-liquid separator is a machine that uses centrifugal force to separate solid particulate matter and flocculent matter in liquids.

3)Solid-liquid separation equipment principle
From the principle of solid-liquid separation process can be divided into three categories of sedimentation, filtration, centrifugation of these three methods, their working principles are as follows.
Sedimentation relies on the role of external forces, the use of disperse material (solid phase) and the density difference between the dispersion medium (liquid phase), so that the relative movement, and the process of solid-liquid separation. Filtration uses a porous material as the medium, and under the action of external force, the fluid in suspension passes through the pores of the medium, while the solid particles are retained, thus realizing the process of solid-liquid separation. Centrifugal is the process of solid-liquid separation by using the action of inertia centrifugal force provided by the device.

2. The main use and scope of use
Mainly used in the reaction of materials (starch slurry, biochemical reaction liquid, fermentation liquid) and other solid-liquid separation

3.Solid-liquid separation equipment parameters
Filtration area: large plate and frame 20 square meters; small plate and frame 4 square meters
Maximum filtration pressure: 25 Mpa
Drum inner diameter of disc centrifuge: 265 mm
Drum speed: 8086 R/min
Capacity of disc centrifuge: 0-1000 L/h

4.Performance characteristics
◆The equipment conforms to the GMP (Good Manufacturing Practice) and can realize CIP in-situ cleaning;
◆Creative discharging method, no scraping and squeezing to the filter cake, which is conducive to maintaining the shape of the filter cake particles;
◆The filter cloth can be well cleaned and regenerated, and no residual cake layer affects the next filtration, which has a strong application value for the extremely difficult filtering materials;
◆Fully closed structure, the shell is fully open, easy for thorough cleaning and inspection;
◆The bag turning mechanism is realized by mechanical structure, no pollution caused by hydraulic operation of the old machine;
◆Adopt special elastic damping damper, positive vibration damping, no need to pour the foundation, that is put into use, the machine runs smoothly and reliably;
◆Use PLC, computer touch screen, etc. to realize the whole process of program control and automatic operation.

5.The abilities Solid-liquid separation equipment needs to have:
1)The solid content of the raw material has a strong tolerance, from 1% solid content to 15% solid content can be separated!
2)The solid content of the liquid separating materials is adjustable. That is to say, the screen pores of the separator should be adjustable, according to the needs of different customers, the replacement of different specifications of the screen;
3)The solid solid content of the separated solids requires high, under normal circumstances, the solid solid content of the separated solids is not less than 30%, below this value, the solids will precipitate moisture when stacked, inconvenient transportation and storage, some processes require up to 35%;
4)The solids content of the separated solids can be adjusted as needed. This requires the separator to have an adjustment device in the structural design, so that customers can adjust it according to their needs.
5) The separator should have a structure to prevent blockage. Generally speaking, the mixture of materials coming in is not very uniform, and some are loaded into the material in clumps, so if there is no timely self-regulation ability, it is likely to cause blockage of the separator, which will lightly require stopping and manual cleaning, and heavily damage the screen and cause damage to the parts.

Tags: solid-liquid separator, filter press