ITCE20090010A1 - AUTOBOTTE FOR ESPURGHI WITH DEHYDRATION AND CHEMICAL STABILIZATION OF SLUDGE WITH SOCCER POWDERS - Google Patents

Description

O. ABSTRACT

The sewage transported by tankers to purifiers, coming from pits: imhoff, pits: septic :, sewer cleaning, sewerage, c: cc. has W1 content of sludge lower: 2%. Of this mud, at least 98% is water. So to transport the W1kg of dry mushroom to the purifier we are forced to transport about 2500 liters of muddy sewage. The undersigned, having already filed a patent application for the sedimentation and stabilization system of sludge with lime powders, also applicable to small sedimentation plants: dqmrnzionc: (deposit n. of c: purge. This application, with the same number of mushroom transported, will allow to reduce: the number of circ transports: to 88 times, reducing costs above all expectations. The system will also reduce purification costs by lightening the workload of the plants; it will favor sustainable local purification; JW1g0 will favor the insertion of the sewage line of static sediment with blade packs, which without any environmental impact will keep the sewers clean, not allowing the development of hydrogen sulphide and the degeneration of sewage before arriving at the purifiers. The same purification plants could conclude the purification cycles (primary, secondary and tertiary) with sedimenters without thickening, dehydration and digestion and find the sludge already loaded on the means of transport without plant and management costs, without producing biogas.

HIMICA OF SLUDGE WITH CALCIUM POWDERS.

ASSUMPTION

sewage transported by tankers to purifiers, coming from imhoff pits, ditches, sewer cleaning, etc. it has a sludge content of less than 2%. Of this angle at least 98% is water. So to transport one kg of mud to the purifier we are forced to transport about 2500 liters of muddy sewage. The undersigned, having already filed a patent application for a system of sedimentation and stabilization of angles with lime powders also applicable to small purification sedimentation plants (deposit no. Ce2009A000008 of I5 / 09/2009) considers the same system also applicable to tanker trucks. This application, with the same amount of sludge transported, will reduce the number of transports by about 88 times, cutting costs beyond all expectations. The system will also reduce purification costs by lightening the workload of the plants; it will favor sustainable local purification; it will favor the long insertion of static sedimenters with blade packs into the sewer line, which without any environmental impact will keep the sewers clean, not allowing the development of hydrogen sulphide and the degeneration of sewage before arriving at the purifiers. The same purification plants would be able to conclude the purified cycles (primary, secondary and tertiary) with sedimenters without thickening, dehydration and digestion and find the sludge already loaded on the transport vehicle without plant and management costs, without producing biogas.

DESCRIPTION

The undersigned, with the filing of patent n. Ce2009A000008 of 09/15/2009 has conceived a simple chemical-physical process that is able to quickly and without excessive bulk transform the suspended substances and part of the Bod of sewage into stabilized mud. This procedure can also be mounted on suitably modified exhaust trucks. Drawing table "A" shows typical sections of future tank trucks. Table "B" shows a hydraulic diagram of the proposed solution. This system is essentially based on the design of a large surface muddy sewage distribution tank (1), at atmospheric pressure, equipped with dozens or hundreds of drain holes. depending on the potential of the plant. A float (1.1.1) is mounted on each hole, which blocks the hole when the slurry is at the minimum level and opens it, thanks to the hydrostatic thrust, when the liveJo rises, discharging a part of it, until the hole closes, caused by the weight. of the float. Since the weights of the floats are the same (adjustable by introducing dry sand inside), and the hydrostatic thrust being the same, the holes will open and close at the same time. A drainage bag suspension sleeve (1.2) connected with the other sleeves will be placed under the holes. A solution of air and lime oxide is distributed inside these sleeves, through a network of stainless steel pipes (2) fed by a blower (3) and from the lime oxide hopper (4) through a rotary valve, with adjustable flow rate, thanks to the motor driven by an inverter (4.1). Then, in all the bags, at the same time, the following will be administered: muddy slurry, air and calcium oxide: Thanks also to the pressurization of the air pushed by the blower (3) and to a slurry diffuser, in the shape of a Chinese hat (1.2.1) , the contact between the various components will be widespread; furthermore, the connection between the sleeves by means of a pipe section (1.2.2), will ensure a uniform distribution of the various components in all the bags, even in the event of any differences in local administration. The fine contact between the water and the oxide transforms this into calcium hydroxide (CA (OH) 2). Calcium hydroxide reacts with the alkalinity of the water retained in the bag to produce calcium carbonate from the calcium bicarbonate, always present in solution, which is mainly responsible for the removal of S.S. (suspended solids) <according to the reaction: Ca (HC03.h Ca (OH) 2 -> 2CaC03>! <+ 2 H20. Thanks to this> reaction, even the finest suspended particles, which would have escaped filtration, precipitate, together with those already formed during the sedimentation process that took place in the pits to be purged. Due to the porosity of the bag, the water and air will come out while the mixture of mud and lime will deposit on the bottom, continuing to amalgamate and interact. to obtain stabilized sludge, the average dosage determined by experimental tests of the major European universities is 500 gr of Cao / kg of dry mud. , 5%, moreover, the dehydrating power of lime, pressurization with air, the long contact and drain time can easily lead us to a total dryness of at least 30%, which we assume acquired, to continue in the sizing calculation of a hypothetical autob get equipped with this system. The slurry, extracted by the self-priming pump of the vehicle (5) is sent to the distribution tank (1), passes through a filtering net (1.1) and is distributed over the entire surface. This tank, at atmospheric pressure, occupies the entire longitudinal section of the modified barrel; it is embedded in the structure of the barrel itself (longitudinally cut and reinforced with stainless steel profiles (11); it can be removed from above (since it is only resting). As mentioned above, the bags will be fed through the unloading system with floats drains (1.2.3) suspended from the tank. To avoid excessive deposits of mud in the tank, facilitate the escape of volatile substances, avoid bad smells, through a network of stainless steel pipes (6) blown air will be introduced into the mud, a few mm from the bottom, coming from a special blower (7). By operating at the same time the sludge lifting pump (5), the blower for the pneumatic transport of the lime oxide (3) and the agitation of the distribution tank (7), there is is the simultaneous introduction of mud, calcium oxide and air into the draining bags (1.2.3). Water and air through the porosities of the bag tissue escape, while the mud and calcium oxide, which in the meantime and becomes to hydroxide or calcium carbonate, are mixed and stratified in the bags until they are completely filled. When the maximum level is reached, detected with capacitive probes, a luminous acoustic signal will be emitted to warn that the bags are full of mud. The waste water, with a presumable PH2, will collect in the barrel compartment below (8). After any cleaning of the pit with clean water, taken from the sector of the barrel below (9) (or other tank supplied, according to the system used by the various manufacturers), by means of the high pressure pump (IO). After the cleaning operations, the washing water will also be passed through the filter bags without adding lime. All the water collected in sector (8) (sewage diluted with washing water) via the guillotine gate (8.1) will be discharged back into the user's pit (septic, irnhoff, sedimentation tanks, activated sludge, etc., ). With this procedure, we will transport only the sludge with the tanker, leaving in the pit some basic aerated sewage for the fine contact with the air, equipped with microorganisms still active for the purification process; we will not discharge the sewage with PH higher than the accepted value (9.5) into the sewer or into the receiving body. Wastewater that will pass into the pit for a long time will be prevented against acidic and foul-smelling fermentation.

To better understand the project, let's consider a tanker with a diameter of 204m of internal volume of about 30 m3 of which 20 m3 are useful for transport purposes by subtracting the space occupied by the washing water, the & anco, etc. Starting from these data, assuming that the sludge produced is 2% of the sewage and that its solid concentration of 2%, the amount of dry sludge that we can transport with a 20 m3 useful tanker is only 8 Kg (20,000 * 2% * 2%). Now let's see how much dry mud we can carry with the modified tanker according to this project: We decide to collect the mud in bags with a diameter of 250 mrn and useful height 700, whose volume is 34 L, presumed weight of 37 kg (1.2.3 ). Having established that 1/3 of the dry content in the bags is lime and having assumed a dry content of 30%, we can assert that in each bag there are 7.4 kg of dry mud (37 * 2 * 0.3 / 3). From the attached drawing "A" we can see that the modified tanker contains 96 bags. Therefore, it overall carries 710 kg (96 * 7.4) of dry mud, about 88 times higher than the only 8 kg transported with current tankers of the same size. The choice of the blower will be determined based on the flow rate of the slurry pump. assuming a flow rate of the purge pump is 10 Us; we will choose a blower (3) with a flow rate of 51 m31h, which allows us to transport only 0.53 kg / m3, to avoid any risk of aggregation of]] and dust and also to use the transport air to pressurize the bags draining. The pressure in the circuit will be about 600 mbar, the average speed of the air in the circuit of 25 - 30 mI sec. The silos (4) shown in the drawing, on the cab side of the vehicle, must contain at least the 370 kg necessary to fill the bags, therefore a capacity of at least 0.5 m3 considering the specific weight of the product (0.81 kgl dm3). In the drawing it can be seen that in the space behind the cabin, in addition to the silos, the two necessary blowers can also be allocated. There are vent holes for the bag pressurization air (12). Since the system has not yet been tested, an additional mini hopper (13) and a mini dosing valve (13.1) can also be provided to add a polyelectrolyte to the aerial solution which can increase the efficiency of dehydration. The solution adopted, shown in section, with the overlapping semicircular tanks, allows the recovery of the upper cylindrical semicircumference removed for the existing tankers to be modified. The removal of the sludge treatment section from the top allows the sludge evacuation, cleaning and maintenance operations to be carried out separately, while the tanker will resume service with a spare section.

Claims (4)

CLAIMS 1) Originality of the conception of a combined waste tanker that allows the dehydration and stabilization of the transported sludge, using powdered lime oxide or hydroxide; without occupying more space than normal tank trucks, reducing the costs of transport and purification of sewage. 2) Originality of the purging cycle, which involves the passage of the sewage in the tanker, where with a physical and chemical process based on lime already patented by the undersigned (deposit no. Ce2009A000008 of 09/15/2009), and the sludge stabilizes. The waste water returns to the tank (septic, Imboff, etc.) without sludge and SOspeSI solids. 3) Originality of the composition of the tank truck, whose cylindrical barrel will be sectioned longitudinally, so as to form two superimposed semicircles to contain, starting from the bottom, the washing water and the draining water of the bags and the section above. sludge treatment that will be removable, so as to allow the sludge evacuation and cleaning of the plant separately. 4) Originality of the conception of the dehydration sector conceived as a container equipped to be replaced in a few minutes, through the electrical and hydraulic disconnection and reconnection (using electrical and fluidic quick couplings, with cables and flexible hoses) whenever the draining bags are full. With this system, the operations of sludge evacuation, bag replacement, cleaning of the distribution tank, etc., would take place at the operator's premises while the tanker will resume service with a spare section.