Water Treatment Environmental Protection and Technology

Screw type extruder

Product principle

By using the principle of screw delivery and squeezing, water flows out from the metal screen mesh while the pressure is increasing and the mesh hole of the filter is decreasing, achieving the purpose of wastewater dehydration.

Product structure

(1)Inlet:sludge flows in the filter by gravity from the outlet of the mixing tank. A liquid level switch can be installed
                  additionally on the top for automatic handling of sludge.
(2)Screwrod :the screwrod is the heart of the screw type extruder, which has sludge delivery and extrusion functions.
                             The threads are screw type with variable lead screw design, which can slowly squeeze sludge out of water.
(3)Filter:its main purpose is to filter out water. The flow distribution is mainly divided into three sections in accordance
                   with the sludge property
                    1.Sludge compression section: It squares out of excessive water from sludge.
                    2.Water pre-compression section: It pre-compresses sludge into a sludge cake.
                    3.Sludge cake compression section: It compresses the sludge cake with high compressive pressure to low water
                       contents in sludge.
(4)Washing device:When handling sludge, the mesh holes on the surface layer of the filter is easy to clog, which affects
                                       water contents in the sludge cake. A cleaning pipe is designed to periodically wash the mesh holes to
                                       avoid clogging with sludge.
(5)Transmission mechanism:Operation is made through the transmission equipment of the sprocket and chains, which are
                                                       driven by a high-torque reducer motor.
(6)Water discharge hole:Sludge filtered water and cleaning water are collected in the water pan of the machine, which will
                                                be then discharged to the wastewater collecting tank or settling tank for treatment.
(7)Outlet:at the sludge outlet, the backpressure can be adjusted and the sludge cake can be scraped off, which is then
                     delivered to sludge storage tank or the conveyor to facilitate sludge transportation.

螺桿式與其他款式比較

主要特色 Main feature
項目
Contents
螺桿式擠壓機
Screw press
皮帶式脫水機
Belt press
板框式脫水機
Filter press
全自動化運轉
Full automation and continuous operation
X
操作環境
Environment
X X
設備保養
Maintenance
X
清洗用水
Screen wash
X X
泥餅含水率
Moisture content
X X
節能
Economize on electricity
X
運轉成本
Running cost
X

符號(Symbol):表示〝優〞(Excellent)      表示〝尚可〞(Good)      X  表示〝不佳〞(Bad)

含水率比較 Water content comparison
生物
污泥
Bio sludge
化學
污泥
Chem- ical
化纖
污泥
Chem- ical& fiber
FGD
污泥
FGD
sludge
原水
污泥
Raw water
紙漿 泥水
Pulp& paper
重油 污泥
Oil
sludge
PCB
污泥
PCB
sludge
研磨
污泥
Putty
sludge
污泥擠壓機
Screw press
85% 80% 80% 40% 55% 52% 75% 75% 70%
皮帶式脫水機
Belt press
90% 87% 90% 60% 70% 70% 90% 87% 80%
板框式脫水機
Filter press
87% 85% 85% 40% 60% 60% 85% 85% 75%

Product features

1.Small size with a small footprint.
2.Least problems on mechanical failures.
3.Fully enclosed design, avoiding escape of unpleasant odor.
4.No consumables, saving operating costs.