Monthly Archives: December 2020

Pressure filter

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Pressure filter
Pressure filter in

DESCRIPTION

Pressure filters are used in those cases where solid substances have to be mechanically filtered out of water. These filters help improve the final quality of the effluent after chemical-biological treatment of the waste water, or can complement the process of clarifying surface water for drinking or for industrial use. They remove the suspended solids and, therefore, the phosphorous and BOD associated with these, and eliminate turbidity, unpleasant odours and flavour, and metals such as iron and manganese.

 

MANUFACTURING FEATURES AND WORKING PRINCIPLES

The filter consists of a cylindrical tank made of steel, with three main sections. The water to be filtered flows through a pipe into the filtration chamber where it percolates through the quartz sand or active carbons in the filter bed. The water then flows through plastic nozzles in the collection chamber into the area below and through the outlet pipe for subsequent use. The backwash process, where a water/air mixture is ejected at high pressure from the base of the filter, occurs automatically at pre-configured times.

The frequency of the backwash process can be programmed according to the manometers at filter inlet and outlet which indicate the progressive load loss due to clogging of the filter bed. The plastic nozzles ensure uniform draining of the filtered water as well as uniform distribution of the backwash air/water mixture.

A remote control can be used to automate the cycle.

Disc Filter

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DESCRIPTION AND WORKING PRINCIPLES

Microfiltration technology combined with the polymer disc permits filtration spans of between 10 and 150 μm and quality separation even in the presence of high hydraulic pressure or peak loads of suspended solids. The new and fast nozzle cleaning system requires little energy and water. The fluids flow from the inside towards the outside, so the suspended solids are captured in the filter and the filter container remains perfectly clean. The modular nature of the disc filtering station is such that the filter units can be made extremely compact with filtering surfaces of up to 8 sq m for each sq m of occupied space.

The polymer fabric offers the following benefits over loose-fibre fabric: no suspended solids pass through the fabric during the washing phase; no suspended solids accumulate in the fabric, so cleaning is more efficient; virtually no wear and simpler maintenance. The incoming water is introduced, through the center tube, between the pairs of discs normally stationary, having a canvas of filtration able to retain suspended solids of magnitude greater than the spacing of the canvas used.

The water flows by gravity through the canvases installed on the discs and the solids are retained accumulating on the inner surface. Reached a certain level of clogging, permanently monitored by a sensor is activated by the rotation of the discs, providing for the discharge of accumulated solids through an opening between them. At the same time the system is activated in pressure washing, carried out in countercurrent, consists of a set of nozzles, easily removable to ensure perfect cleaning of filter cloths.

  • Structure of the disc in stainless steel;
  • Type of filter element: Polymer filter fabric or AISI 304/316;
  • Tank for washing water;
  • Backwashing system: mobile arrays of nozzles and multi-stage pump;
  • Central shaft for supporting and feeding the filtering sections, made of stainless steel;
  • Transmission system consisting of a chain made of special steel connected to a pinion;
  • Control geared motor: with worm and helical gears;
  • Cover with mobile windows for inspecting the filtering discs.
  • Control board with IP55 protection.

APPLICATIONS
The uses of disc filters:

  • Capturing residual suspended solids after secondary sedimentation tanks due to rising swollen mud, floating foam and/or excessive hydraulic pressure;
  • Separation of excess mud after the submerged rollers, percolator filters and other biofilm processes, in lieu of conventional secondary sedimentation tanks;
  • Reducing the content of phosphorous in fluids released by existing or new systems, possibly in combination with floccular-filtration;
  • Separation of solid substances after chemicalphysical treatment of industrial sewage;
  • Pre-filtration for: biofilm nitrification processes, for UV sterilization, processes with membranes, for surface waters to be converted into drinking water;
  • Treatment of water for industrial use and for recycling;
  • Increasing the performance of lagooning systems.

Shaftless Screw Conveyor

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Shaftless Screw Conveyor

DESCRIPTION AND WORKING PRINCIPLES

Shaftless screw conveyors consists of a screw, without internal shaft, driven by a power transmission, rotating inside a trough carrying material loaded through one or more hoppers, to one or more exhaust ports, possibly equipped with shutoff sliding valve. The machine can be in a “pull” configuration, i.e. it pulls the material from the towards the outlet, being the drive after the outlet spout, or in a “push” configuration when the material is pu-shed by the spiral towards the drain. The power transmission can be direct, with the gearbox’s output shaft directly connected with the screw flange, or it can be a system consisting of motor drive system – chain – flanged shaft connected with the screw.

Shaftless screw conveyors are suitable to tran-sport clogging materials, such as sludges or screenings, which otherwise would tend to stick to the shaft of the screw. The working range of the conveyor is typically between 0° and 30°, with decreasing efficiency proportional to the increasing inclination.

 

MANUFACTURING FEATURES

  • A trough with bolted covers made of stainless steel AISI 304 or AISI 316
  • A shaftless screw, in Carbon Steel, AISI 304 or AISI 316
  • One or more hoppers inlet, depending on the application
  • One or more discharge outlets (only one in the case of axial discharge / even more in case of a vertical discharge)
  • A motor that can be push or pull type

The material to be conveyed is transported by the screw which rotates on antiwear bars or on high density molecular polyethylene, depending on the type of material to be transported. The screws can be supplied with single or double spiral. The screw conveyor model X-CONV are formed from sections bolted as regards of parts subject to maintenance, and welded parts in the load-bearing structures, so as to ensure a high structural strength and a perfect hydraulic seal. The screw conveyor model X-CONV are ideal for the transport of solids usually difficult to manage, irregular and different from one another, including:

– Sand and granular substances in general
– Screenings
– Thickened and dewatered sludge
– Canned Foods
– Materials pasty or creamy
– Meat, fish, vegetable, fruit, vegetables

Belt Conveyor

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Belt Conveyor
DESCRIPTION AND WORKING PRINCIPLES

The belt conveyor model X-BELT.CONV is used to convey in a dumpster or in a specific part of the plant materials discharged from the screens, filters or machinery in general. Thanks to a special belt made using a dual cure and a scraping blade, the belt, every complete lap, come back to the collection point, clean without residue in order to start a new cycle of work. In order to avoid lateral losses of material, the frame is suitably bent so as to accommodate the scraps and keep over the tape. The material to be conveyed is deposited on the belt, which, slowly turning it carries up at the end of the machine where by gravity falls in a dumpster or in a special space. At this point, the belt rotates in such a way to return to the point of starting a new load cycle. To avoid that the tape work dirty, under the discharge zone is applied scraper blade.

MANUFACTURING FEATURES

  • A supporting structure made of Stainless Steel AISI 304 or AISI 316
  • Two or more support legs to the same extent in case in which the machine was horizontal, of different height in the case in which it was inclined realized in Stainless steel AISI 304 or AISI 316
  • A special canvas continuous dual cure
  • A motor of the type with worm and helical gearboxes. 220/380 Volt, 50 Hz three-phase, IP54, class F.
  • Feeding rollers properly sized.

Sand Classifier with Longitudinal Hopper

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Sand Classifier with Longitudinal Hopper
SET1 800
SAND CLASSIFIER WITH LONGITUDINAL HOPPER (ALSO WITH STATIC AND NON-STATIC DEGREASING SYSTEM)

The Sand Classifier with Longitudinal Hopper make a selection of the grit for the principle of gravity and thanks to the whirling motion create by blower, moving the particles, separates the grit from the organic material that due to major specif weight respect to the water decants on the bottom of the hopper, where there is a bottom screw that carries the grit in a collection tank; also bring in suspension oil and grease. An inclinated, called extractor, pick up the grit and bring it out of the machine. The grease removal system is make of a series of plate moved by chain that scrapes the water and bring the grease in a collection hopper.

The water rich of organic material exit to the machine for overflow from an appropriate discharge.

Combined Unit with Degreasing System

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Set 2 800

COMBINED UNIT WITH DEGREASED SYSTEM
The combined unit with degreasing system model SET 3 make a first screening with a screw screen placed on the top of the machine; the solids with dimensions major to the mesh are trapped. Thanks to a series of brushes mounted on the screw are rimoved the solids and are washed and compacted before the discharge. haks also to high pressure nozzles the screen remain without solids always. The water and the solids passed trought the screen are collected in a rectangular tank, where a blower create a whirling motion dividing the water form grit, grease and organic material; this last two remain on the surface of the water, while the grit decants on the bottom for the major specific weight where met a bottom screw that collect in a little tank the solids and an other screw lift up the solids bringing it at the external of the machine. The grease removal system is make by the whirling motion create by blower that push the grease on the opposite site of the blower where overflow in a appropriate channel; a nozzle with high pressure water bring out of the machines the grease. The clean water overflows out of the machine throught an appropriate hopper.

Mini Set 3

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Mini Set 3

DESCRIPTION AND WORKING PRINCIPLES

It’s an equipment in the condition to complete the mechanical pre-treatment in the small wastewater treatment plants having a flowrate up to 30 m3/h. Screen screw compactor with the best efficiency in terms of solids capture ratio and dewatering of screenings. The grit removal system is able to capture up to 90% of grit having minimum size 200 microns. Grease removal system can obtain a separation of up to 80% of the grease present in the effluent.

Mini Set 2

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Mini Set 2

DESCRIPTION AND WORKING PRINCIPLES

MINI.SET 2 is a combined equipment for screenings and grit removing; it represents the most economical solution to treat low flowrates. The incoming wastewater is filtred throught a screw screen than goes into the settling tank. The internal baffle system allows an efficient separation of the sand that is collected on the bottom of the tank and removed with a manual valve or solenoid valve.

MANUFACTURING FEATURES

  • Screws: high strength carbon steel or stainless steel AISI 304/316
  • Structure: stainless steel AISI304/316
  • Filtration: 0.5 – 6 mm
  • Flowrates: from 2 l/s to 13 l/s
  • Screen Basket: wedge wire/perforated plate

Combined Unit

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Combined Unit SET 2
SET1 800

The Combined Unit model SET 2. make a first screening by a screw screen placed at the top of the machine; the particles with dimension major than the mesh of the screen are trapped. Thanks to a series of brush mounted on the screw are removed and lifted the solidi that are washed and compacted befor the discharge. Also thanks to high pressure nozzles the screeen remain clean and without solids costantly.

The water and the solids passed throght the screen are collected in a longitudinal tank, where a blower cause a whirling motion that separate the grit from the organic material; the last one remain on the surface of the water, while the grit decants on the bottom for major specific weight respect to the water, where a bottom screw conveys the material in a collection tank. Now a extracting screw lift up the grit and discharge it out of the machine. The water for overflow exits out of the machine throught an appropritate hopper.

Flotation Units

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FLOTATION UNIT

DESCRIPTION AND WORKING PRINCIPLE

The waters coming from the sites of collection, should be collected in a silo or in a underground tank, which will be used as storage. The chemical-physical flotation plant must be fed at a constant flow rate. In order to protect the flotation unit from solids with size greater than 3 mm, which would cause breakage to the mechanical parts, in particular to the sealing of the saturation electromp, is necessary to put a dynamic or static screen before the flotation unit. The depuration plant with a flotation unit has the aim to remove 80% of fats and SST, in order to reduce the organic load input to the biological purification plant, or to the discharge into the sewer. The plant is completely AUTOMATIC to switch on and off, and for the preparation and dosing of chemicals for coagulation and flocculation of the wastewater to be purified. The reaction of coagulation/flocculation will occur directly in the supply line of the flotation unit, where the coagulant is dosed (PAC, ClFe3) and polyelectrolyte already diluted to the use concentration (0.2-0.3%). The polyelectrolyte will be prepared in a special automatic unit, using the mother product in emulsion or in powder, at request. The flotation unit tank is completely made in stainless steel AISI 304, or, at request, in stainless steel AISI 316. The flotation tank is divided into three compartments, but in a single block.:

  1. Saturation tank
  2. Hopper, with a shape of a truncated pyramid, for the collection of the floated material
  3. Tank for the accumulation and discharge of the clarified water

Inside the tank of saturation, due to the air dispersed in tiny bubbles, the coagulated and flocculated wastewater will be dragged quickly on the surface of the liquid where in a few minutes will thicken, and may be evacuated by a series of scrapers dragged by chains and sprockets in stainless steel and transferred to the collection hopper. The saturation of the effluent with compressed air, takes place inside a tank of saturation, of vertical cylindrical shape, suitably dimensioned according to m3/h entering the flotation unit. Inside the tank of saturation, the pressure required is about 3-4 bar, this pressure is regulated by a special diaphragm valve, of type “started flow”. At the first start is established the optimal pressure and this will not have to be changed more. The amount of air inside the tank saturation is dosed by a specific flow meter for air. The amount of air required must be checked at the first start, and must not be changed. The pump saturation, open impeller type, backward with shaft and impeller made of stainless steel, collects inside the tank of saturation a portion of the wastewater of about 3-4 times greater than the amount of wastewater in entry, and sends it to the tank of saturation, where it will occur the contact with the air. Following, is returned at the entrance of the wastewater, air-saturated, so as to allow the pushed upwards of TSS in the wastewater. The clarified liquid will be discharged by gravity, while the thick mud will be transferred by means of progressing cavity pump, into a special tank or thickening tank and then disposed of by self-venting or further dehydrated.

AUTOMATIC OPERATING CYCLE

The whole plant is automatically switched in parallel at the start of the feed pump, and then the electrical panel will receive from the external pump, a signal (clean contact) of the operation of the pump and then of the arrival of the wastewater:

  • Saturation electropump
  • Compressed air solenoid valve
  • Chain gear motor
  • Coagulant dosing pump
  • Flocculant dosing pump

The switching off of the plant is calibrated, with an adjustable delay in minutes, at the de-energizing of the electrical feeding pump. During operation, the saturation electropump and the electric pumps for the chemicals dosing, will function in a constant way, while the gearmotor of the catenary for the evacuation of the flotated, with timer function “pause-work”, adjustable in minutes, to have the necessary time for the lift of the suspended solids. In case is present the single screw pump for evacuation of the flotated, the pump will run and then turn off, in parallel to the motor of the catenary. The preparation of the diluted polyelectrolyte is automatic and can be made of stainless steel (monobloc tank) or in two tanks in PVC, one for the preparation and one for the storage of the polyelectrolyte.
The water line network is intercepted by a solenoid valve that is controlled by level probes resistive, (three-pointed probe) which indicate when the solenoid valve should be opened (at the minimum level) and when it shall close (to reaching the maximum level). During the passage of water for the filling, in the same current will be injecting the polyelectrolyte, in emulsion or in powder form, dosed from the progressive cavity pump or from the powder doser, timed so as to obtain the concentration of use. The polyelectrolyte prepared will be constantly mixed by a slow agitator, and dosed with a dosing pump piston with stainless steel head, for flow rates up to 500 l/h, or positive displacement pump with the head in stainless steel for higher flow rates.

CONSTRUCTION MATERIALS

  • Flotation tank: Stainless Steel AISI 304/316
  • Floated material evacuation and dragging chain: Stainless Steel AISI 304/316
  • Guide chain: Polizene 1000
  • Plates for the dragging/collection of the flotated material: Stainless Steel AISI 304/316 – Rubber (thickness 10mm)
  • Chain shafts and pignon: Stainless Steel AISI 304/316
  • Saturation tank discharge valve: Stainless Steel AISI 316
  • Saturation valve (started flow type): Spheroidal Cast iron GG25 with NBR membrane
  • Saturation electropump: Centrifugal pump with open impeller and backward in Stainless Steel AISI 316
  • Air flow meter: Plexiglass
    REGULATION
    The flotation unit is dimensioned according to the input flow rate, the amount of TSS and the type of waste, for example for the application in cured meats factories and creameies, there is the need of pipes with larger sections, due to the significant amount of fats present in the wastewater. From the model X-FL 300, is allowed both the adjustment of the liquid level inside the tank of saturation, both the height adjustment of the catenary and the scraping blades. This is to optimize the consistency in percentage of dry product floated. The X-FL 100 and X-FL 200 have the only adjustment of the liquid level. The standard models and their characteristics are described in the following table. It is possible to customize the machines to flow rates lower or higher than those described.