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Screw Press Sludge Dewatering Machine AS-NH 404/SC Series Technical Manual

Screw Press Sludge Dewatering Machine AS-NH 404/SC Series Technical Manual

May 15,2024
Screw Press Sludge Dewatering Machine AS-NH 404/SC Series Technical Manual
By: Kate Nana
Post Date: May 15th, 2024
Post Tags: MBBR, Secondary Wastewater Treatment
Table Of  Contents

1. Product Overview and Introduction

2. Operational Principle Introduction

3. Specifications, Data, and Other Parameters

4. Accessories and Configuration Description

5. Flow Chart and introduction

6. Description of supporting Equipment

7. Comparison Reference for Various Types of sludge Dewatering Machines
1. Product Overview and Introduction

1.1 Technical Introduction

The screw press sludge dewatering machine originated from advanced foreign technology and was later introduced to the domestic market to achieve localization. Over the years, it has been widely applied in the wastewater treatment processes of various industries, serving as a complement to existing domestic technology products. This product features a long service life, compact footprint, easy maintenance, low operating costs, and the ability to operate fully automatically 24 hours a day. Additionally, its ability to handle low concentrations reduces reliance on sludge storage tank concentration tanks) to some extent, saving investment costs for new wastewater projects.


1.2 Application Scope

The screw press sludge dewatering machine has a broad range of applications. It can be used in various industries including oil, municipal, chemical, aquaculture, pharmaceutical, textile dyeing and printing, and mechanical manufacturing. lt can also be partially utilized in the finished products industry.

2. Operational Principle Introduction

The schematic diagram above shows the main body of the screw press, which consists of fixed rings and moving rings overlapping each other, The front section is for concentration and filtration, while the resection is for extruding the sludge. A screw shaft runs through it, driving the moving rings in the ringpieces to rotate, thus achieving gradual dehydration. The gap along the screw shaft progressively decreases, thereby continuously increasing the pressure within, ultimately ensuring thorough dehydration. This process aims to reduce the moisture content of the sludge. The rotation and pressing of the ring pieces also serve to clean the rings during operation.

3. Specifications, Data, and Other Parameters

3.1 Equipment Data

Equipment Model
AS-NH 404/SC
Sludge Generation Rate
~360-600kg/ds/h
Total Power of Equipment
9.0kw
Cleaning WaterVolume
~200L/H
Management Frequency
5 min/day
Equipment NetWeight
~3950kg
Operating Weight
~5300kg
3.2 Environmental Setup Description
Temperature Range
0℃~+40℃
(Must not freeze)
Humidity range
<90%RH
Altitude Range
Suitable for domestic use
Voltage standard
380V,50/60HZ
Supply water Pressure
0.1-0.2Mpa
Site requirements
Best indoors
Note: The above data is partially theoretical and should be specifically referenced against the water quality conditions of the unit.
3.3 Specification Parameter
Equipment Model
EA-404/SC
Unit Quantity
1 pcs
Component Name
Specification Parameters
1
Total Dimensions of Equipment
L4800*W2200*H2100mm
2
Total Power of Equipment
9kw
3
Voltage Standard
380V.50/60HZ
4
Main Parameters
Size
400*2650mm
Quantity
4 pcs
Material
Main Shaft is made of Stainless Steel(ss304)
5
Screw Press Motor
Model
EKAF97ER57-Y1.5-4P-505-M4-A-180
Waterproof Grade
IP55
Power
1.5kw*4
Note
Motor brand may be changed as per customer requirements or due to supplytimelines, with customer's permission
6
Flocculation Mixing Tank
Dimensions
L2000*W1000*H1200mm
Material
SUS304
Shape
"口"-shaped
7
Stirring Motor
Model
NMRV75-60-1.5kw
Waterproof Grade
IP55
Power
1.5kw*2
8
Solenoid Valve
Model
2W-20B-AC220V
Size
DN25
Material
SUS304
9
Level Gauge
Model
HA-3S
10
Control Panel
Size
W600*H700*D250mm
Material
SUS304
Note
Motor brand may be changed as per customer requirements or due to supplytimelines, with customer's permission
4. Accessories and Configuration Description
Wear Parts
Material
Service Life
Moving and Fixed Rings
SUS304
Approximately 17,000 hours (about 2 years)
Main Shaft of Dewatering Machine
SUS304
Approximately 35,000 hours (about 4 years)
Note: The timeframes indicated above are approximate. Actual operation times will depend on the sludge and site conditions.
Accessory Equipment List
1
Medication Pipeline equipped with a y-typ Filter
2
Outlet equipped with piping and valves
3
Spraying and Cleaning System
4
Solenoid Valve
5
Level Gauge
6
Spare Rings (20 sets)
7
Screwdriver, Socket, and other maintenance tools
8
Operation Manual, Quality inspection Report, Certificate of Conformity, and other
9
Connecting Hoses and Accompanying Electrical Cables, etc.
10
Filtrate Recovery System
5. Flow Chart and Introduction
Process Description:

Step 1: Sludge is transported to the measuring tank via an inlet pump and flows into the flocculation mixing tank, with excess material returning to the sludge pool via an overflow pipe. Filtrate is discharged from the outlet.

Step 2: A high-molecular-weight flocculant is injected into the flocculation mixing tank. After stirring, flocs form and pass through the gravity concentration section of the screw press main body into the dewatering section.

Step 3: In the dewatering section, the pitch of the screw shaft gradually decreases towards the direction of the sludge cake outlet. The internal pressure increases due to compression by the backpressure plate, achieving dehydration and expelling the dehydrated sludge as a cake. The foundation's need and height can be determined based on the actual height of the
equipment receiving the sludge cake. Since the dewatering machine does not vibrate during operation, there is no need for pre-embedded screws. After installation, it can be, secured with expansion screws.

Step 4: The control cabinet on this dewatering machine includes a control system for a dosing pump and a sludge transfer pump. Please refer to the wiring diagram when connecting the wires
6. Description of supporting Equipment

6.1 Sludge Pump Selection

The sludge pump continuously transfers sludge from the sludge pool to the dewatering machine without the need for a high-pressure pump. The sludge transfer rate per unit time is calculated based on the maximum processing capacity of the dewatering machine for dry sludge and the actual concentration of the sludge.


Suppose the model is EA-404 with a maximum dry sludge processing capacity of 800 [kg-DS/h] and a sludge concentration of 10,000 [mg/L] (the sludge concentration determines the selection of the sludge pump and should be accurately measured).


Sludge transfer pump capacity = 800 [kg-DS/h] × 1000 [g/kg] ÷ (10,000 [mg/L] ÷ 1000 [mg/g]) = 80 m³/h.


A submersible sewage pump with a capacity of ≤80 cubic meters per hour (with adjustable function) can be chosen. It is advisable to set the height of the sludge dewatering machine higher than the sludge pool to minimize the excess sludge flowing back to the sludge pool due to excessive pump flow. It is recommended to install a valve on the sludge transfer pipe to allow excess sludge to quickly return to the sludge pool.


6.2 Dosing Pump (Metering Pump) Selection

The dosing pump is used to transport the polymer flocculant solution to the flocculation mixing tank of the dewatering machine. The additional amount of polymer flocculant can be calculated based on the dry sludge processing capacity of the dewatering machine, flocculant addition rate, and dilution ratio. The flocculant addition rate is related to the properties of the sludge and the type of flocculant; the ideal floc diameter is 5mm. The dilution ratio can also be adjusted according to actual conditions.


Suppose the model is EA-404 with a capacity of 900 [kg-DS/h], a powder polymer coagulant addition rate of [0.6%], and a dilution ratio of 1000 times. Polymer flocculant pump capacity = 900 [kg-DS/h] × 0.6% × 1000 × 1000 [g/kg] ÷ 60 [min/h] = [50 liters/minute]. It is recommended to choose a 50L/min metering pump


6.3 Dosing System


1. Automatic Dosing Machine (1 set)

Features: Automatically add water and chemicals as long as a sufficient amount of dry flocculant is prepared. The dosing amount is relatively stable, although the equipment is expensive


2. Manual Dosing Barrel (1 set)

Features: Mainly consists of a mixer and a dosing barrel, but it is not easy to operate the equipment unattended for long periods. It can also lead to unstable concentration configurations, causing waste.


The above calculation data is for reference only and should not be used as actual operational data; actual site data should be calculated based on the site conditions.

7. Comparison Reference for various types of Sludge Dewatering Machines
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