Dewatering of existing sludge filter press:

At present, ordinary sludge filter press, such as plate-frame filter press, belt filter press, chamber filter press, membrane filter press and so on, the moisture content of sludge dewatering is more than 75%-85%.

The sludge after dewatering treatment in sewage treatment plant or chemical enterprise needs to be heated and dried by government enterprises, flue gas and so on. The amount of tail gas is large, the amount of cooling water is large, the cost of sludge treatment is high, and it is not environmental friendly.

Another method of deep sludge dewatering is to dewater the sludge from ordinary sludge filter press, add lime and other solid powder, and then dewater the sludge by a new type of sludge filter press. The sludge dewatering to less than 65% moisture content. This treatment method increases the solid content of sludge, ash content, reduce the organic content of sludge, calorific value, etc.

The new plate-frame filter has the largest press force in 0.6-0.8MPa, and the dehydration period needs 3-4 hours. The filter plate is PVC, and it is easy to change at high pressure.

Compared with the ordinary sludge filter press, the membrane filter press with better sludge dewatering effect only adds a layer of rubber diaphragm, which can only pass through the compressed air or water of 1-2MPa instantly, and dewatering the sludge instantly. The sludge moisture content was reduced to about 70%.

Generally speaking, there is no ideal sludge depth dewatering equipment and process in the sludge filter press market for a long time, until the ultra-high pressure sludge drying process and the high pressure sludge filter press introduced by Zhengzhou Dingsheng in recent years.

Main technical parameters of high pressure sludge filter press:

The sludge moisture content is the same as that required by ordinary sludge filter press. The sludge moisture content can be more than 90%, and the water content can reach 15-60.

The supporting sludge feed pump is a high-pressure piston pump with a pressure of 2MPa.

The pressure of filter plate of ultra high pressure filter press is 6-8MPa, the material is high strength alloy steel, the pressure is big, do not deform;

The production capacity of the Teng Sheng ultrahigh pressure filter press is 1: 1-20 t / h, and the sludge dewatering period is 40 minutes.

Sludge quality and moisture content after mechanical dewatering of sludge accord with the utilization standards of sludge incineration, sludge making nutritious soil, sludge making building materials, etc., without secondary drying, sludge treatment process is simplified and sludge treatment cost is reduced.

Deep dewatering process of high pressure sludge filter press:

The modified sludge is transported by the sludge feed pump to the fast filter plate of the high pressure filter press at the peak of the 2MPa pressure. Some moisture is filtered out under the pressure of the sludge during the transportation period, and when the pressure rises to 2MPa, It shows that the sludge is filled between several filter plates of the high pressure filter press, and the high pressure feed pump will no longer continue to transport sludge. When the sludge feed pump stops running, the feed valve is closed. The oil pump and hydraulic system of the ultra high pressure filter press begin to work. The pressure of the 6-8MPa provided is to push the filter plate to squeeze the sludge between the filter plates through the compression spring to form dry mud cake with moisture content below 60%. After the sludge has been mechanically dried, the automatic discharge device of the peak ultra high pressure filter press is started, the filter plate is opened, and the cake is discharged by blowing air. The mud cake is transported to the designated position to complete sludge dewatering.

Ultra-high pressure filter press has obvious advantages in deep dewatering of sludge machinery in China. For example, the high pressure filter press has been used in electroplating plant, paper factory, printing and dyeing factory, pharmaceutical factory, etc. The comprehensive treatment cost of sludge is reduced by less than 50%, and the efficiency of sludge dewatering is increased by 70%.