What kind of sewage treatment is Doyen environmental protection plant suitable for belt thickener or belt filter press?

     Knowledge of belt filter press talk about what kind of wastewater treatment green world environmental protection plant is suitable for belt thickener or belt filter press;The water content of the excess sludge discharged from the sewage treatment plant is generally about 95% – 99%. It is necessary to use the thickener or thickener to reduce the water content below 97% before the belt filter press can be used for dehydration. Because the nitrogen and phosphorus in the sludge are easily dissolved in the sewage when the concentration tank is used for concentration, it is more likely to use mechanical equipment such as belt type concentration filter press.

     The water in sludge can be divided into external water and internal water according to its existing form. The external water includes pore water, attached water, capillary water and adsorption

     Water. The pore water accounting for 70% ~ 80% of the sludge water can be separated by belt thickener. The strong binding force between attached water (water film on the surface of sludge particles) and capillary water (10% – 22%) and sludge particles requires the use of external forces such as belt filter press for squeezing separation. Adsorption water (5% – 8%, including internal water) can only be removed by drying or burning.

     The belt thickening and dewatering integrated filter press is composed of a belt thickener and a belt filter press in series to treat sludge with a moisture content of more than 99%. Working principle of the belt thickener: the sludge and chemical flocculant are fully mixed through the mixer. After further reaction in the maturing tank provided by the thickener, they are distributed on the gravity dewatering table of the thickener, and the sludge water seeps down through the mesh belt with the help of gravity. Sludge solids are retained on the net belt and discharged separately. The belt thickener is mainly composed of a maturing tank, a gravity dewatering table, an adjustable mud rake, a mud dam, a discharge port and a drainage pipe. The sludge volume after thickening is 1 / 10-1 / 4 of the original.

      In the process of sludge dewatering, there is no need to add flocculant twice for the integrated equipment. In order to improve the treatment capacity of the subsequent belt filter press, the sludge should be fully concentrated, but the solid content of the concentrated sludge should not exceed 8%, otherwise it is not easy to evenly distribute on the gravity section of the filter press. Generally, the solid content of sludge after concentration should be 3% – 6%.

      The belt filter press is generally composed of four parts: gravity dehydration section, pre pressure filter area, low pressure filter area and pressure filter area. After concentration, the flocculated sludge is evenly distributed on the gravity dewatering table. With the help of gravity, the sludge water is effectively released, which makes the sludge lose its fluidity and enter the pre dewatering area. In the pre dewater area, the two mesh belts gradually close together, start to apply pressure on the sludge and slowly increase, so as to build a good sludge squeezing structure. In the low-pressure area, the mud cake is clamped in the middle net belt by a super large diameter roller and wound on the roller shaft with a large contact angle, so as to make the pressure rise gently. In the filter pressing area, a plurality of rollers are arranged in S-shape, so that the two mesh belts are continuously rolled with the mud cake in S-shape. At the discharge port, the net belt is opened, and the mud cake is discharged from the discharge port. The solid content of the mud cake is more than 20%.

      The purpose of adding a thickener to the belt filter press is to extend the sludge retention time on the gravity dewatering table, so as to improve the overall hydraulic load treatment capacity of the dehydrator. The longer the dewatering table is, the longer the sludge retention time is, the more free water is filtered out, and the greater the hydraulic load treatment capacity is. In general, the effective length of the gravity dewatering table of the thickener in the integrated thickening and dewatering machine is 1-3 m, and the length of the gravity section of the filter press is 3-4 m, that is, the total length of the gravity dewatering table is 4-7 M. For example, the effective length of gravity section of the thickener is about 2.5m, and the effective length of gravity section of the filter press is 4m. The one-piece thickening and dewatering machine of national light industry can deal with the excess sludge with a moisture content of 99% – 99.7%, and the moisture content of dehydrated sludge cake is about 80%. It depends on which kind of sludge it is, and the moisture content of different sludge dewatered water is also different.

       Doyen specializes in providing belt press equipment for the Southeast Asian market. Welcome to visit our workshop, according to the actual situation of your company, develop a more scientific dehydration program.Welcome to joyce@doyenchina.com or visit https://www.doyenchina.com.