Equipments

ELASTIC MEMBRANE DIFFUSER



The operating principle the EM diffusers is based on the distribution of fine air bubbles in the water mass. The product composition and shape are set out in the figure below.
The support (1), made of plastic, features resistance ribs and it has a slightly convex shape, for the elastic membrane to adhere thereto and to keep the air outlet closed while the diffuser is not working, thus avoiding the penetration of the water into the distribution pipes. The circular profiled rib (3) is for additional sealing (in the periods of rest). The membrane (2) is made of ozone-resistant special rubber, with a high degree of elasticity and a good break resistance. The membrane features a large number of air diffuser outlets, which distribute the air as fine bubbles (the size of the bubbles exiting the diffuser : 1…3 mm). The supporting membrane is fastened with a collar (4), which is made of a corrosion resistant material. The compressed air is inserted through the threaded spigots (R).
difuzor_membrana_elastica_400
Technical features :

 

- sizes
- net weight :
- air flow rate per diffuser :
- capacity of oxygenation in the clean water :
- loss of pressure per diffuser :
- energetic efficiency :
ø=330 ±2 mm; g=35 ±2 mm, racord = ½”;
900±50 g;
Q=2...10 Nmc/h (uzual: 3...6 Nmc/h);
14...24 gO2/Nmc ;
max.45mbar;
2,5...4,5 kgO2/kWh.
difuzor_membrana_elastica_grafic1  difuzor_membrana_elastica_grafic2  difuzor_membrana_elastica_grafic3 



The values shown in the flowcharts are indicative. The amount of oxygen and the yield depend on various factors, such as : the shape of the tank, the immersion depth, the diffuser planting density, the specific air flow rate, the conditions of flowing into the tank, the efficiency of the blower used.

 


ELASTIC MEMBRANE DIFFUSER WITH ADJUSTED FLOW RATE



    - it provides the even dispersion of the air into a distribution network, by self-adjusting the gas flow rate on each disperser by means of the adjusting element ;
    - it protects the membrane in case of overloading, by limiting the flow rate to the imposed value, which leads to a twofold service life ;
    - it facilitates the installation of the distribution network on the bottom of the dispersion tanks in very beneficial technical-economical conditions.

The disperser with an elastic membrane and an adjusted flow rate is composed of a body (1), equipped with stiffening ribs (a) and a thread for joining to the network (b), on which the collar (2) tights up the corrugated membrane (3) where there are a significant number of slots laid out helicoidally. The under pressure gas penetrates through the cavity (c) and through the open valve (5) into the clearance between the body and the membrane, it stretches the membrane, thus performing a linear dependence between the pressure drop on the membrane and the flow rate of gas dispersed in the liquid, until a preset flow rate (Q1) is reached. At this moment, the flow rate regulator (4) begins operating ; it gets fastened onto the valve (5) and, due to its special constructive shape, with radial ribs made of the same material with elastic membrane, throttles down the gas admission section at the level of the surface, until a limit flow rate (Q2) is reached. These little variations of the flow rate dQ = Q1 – Q2 bring forth great variations of the pressure dP = P1 – P2 on the flow rate regulator characteristic to each disperser and they lead to the correction of the constructive and mounting deviations of the dispersers mounted in a network.

difuzor_membrana_elastica_debit_reglabil_01 
 difuzor_membrana_elastica_debit_reglabil_2_400


Technical features :
    - sizes : Ø 330 x 65 (± 2) mm
    - net weight : 1000 (± 50) g
    - air flow rate : Q = 1 N m3/h clean water, Q = 2 N m3/h used water
    - the bubbles increase upon the exit from the disperser : maximum 3 mm
    - the capacity of oxygenation in clean water (in case of a 1 m high water column and a planting density of 1-4 pieces/m2): 19-24 g O2/Nm3
    - the loss of pressure per membrane : maximum 150 mbar
    - energetic efficiency : 3.5-4.5 kg O2/Kwh

difuzor_membrana_elastica_debit_reglabil_grafic1_400  difuzor_membrana_elastica_debit_reglabil_grafic2_400 


Codification :
    - for the clean water : EMDR 1 ¾ P
    - for the used water : EMDR 2 ¾ E

 

AIR DISPERSION NETWORKS WITH ELASTIC MEMBRANE DIFFUSERS



Destination : the transfer of oxygen into the water

Diffusers’ features :
    - immersion depth : 0–8 m
    - mounting density : 2-6 pcs./m2

Scopes :
    - water biological aeration ;
    - fat separators aeration ;
    - fish tank aeration.

Advantages :
    - simple construction ;
    - easy to maintain ;
    - high reliability ;
    - modular mounting in multiple variants ;
    - easy to implement in any shape of tank ;
    - The diffusers enable the optimisation of the dispersion capacity from the viewpoint of the energetic efficiency.
    - They facilitate the installation of the distribution network on the bottom of the tanks with invert inclination slopes.
    - They protect the membrane in case of overload, by limiting the flow rate to the imposed value, thus extending the service life.

Constructive variants (made of PE or authentic stainless steel):
    - modulated
    - fastened onto a plane bottom, with EM diffusers   
    - fastened onto a sloped bottom, with EM diffusers


INSTALLATIONS WITH BIG BAGS FOR SLUDGE DEHYDRATION

 

Destination : the discharge and the treatment of the sludge from the domestic and industrial waste water treatment plants

Features :
    - installations complete with 3÷8 big bags and a 250-700 kg/day retaining capacity
    - dehydration : max. 20% of dry substance
    - rated power : 1.5 – 1.7 kW.

 Composition :
    - poly-electrolytic solution dosing plant ;
    - reactor for mixing and distributing the treated sludge into big bags ;
    - sludge transferring pump ;
    - support-frame with a grate and a tank for collecting the filtered water ;
    - control and automation panel ;
    - big bag conveying trolley.
inst_saci

 

MECHANICAL SCREEN




 

Destination : to retain and to eliminate the coarse solid matters upon the entrance in the waste water treatment plants

• BASKET SCREEN

Features :
    - useful volume : 60 l
    - maximum load : 1000 kg
    - water speed : max. 1 m/s

gratar_cos_400

 

• PLANE SCREEN WITH MANUAL CLEANING SYSTEM

 

Features :
    - grate width : 400–1000 mm
    - flow rate : 0-100 l/s
    - water speed : max. 1 m/s

gratar_plan_manual_400


    • PLANE SCREEN WITH SELF-CLEANING SYSTEM

Features :
    - grate width : 400–1000 mm
    - flow rate : 0-100 l/s
    - water speed : max. 1 m/s

Advantages :
    - high retaining efficiency
    - automated operation
    - safe reliable operation

gratar_plan_automat_400

    

• ROTATING SIEVE

 

Features :
    - slot sizes : 1–6 mm
    - flow rate : 0 - 30 l/s
    - water speed : max. 1 m/s

Advantages :
    - high retaining efficiency
    - automated operation
    - safe reliable operation

sita_rotativa_400



 

AIR-LIFT PUMP

 

It is a device that conveys water and sludge by using compressed air as a motive vehicle. The mixture of air and water gives rise to a heterogeneous gas-liquid system, whose density is lower than the one of the liquid, which brings forth its lifting on the upsetting pipe until a height resulted from the communicating vessels principle.

Features :
10 m3/hour of sludge are transferred at a 6 m3/hour air flow rate (air/water flow rate for Ht = 4000 mm and Hr = 500 mm).

pompa_aer_lift1_400  pompa_aer_lift2_400