Zhejiang Province, Lishui Sanlian environmental protection mechanical equipment Co. Ltd., founded in 1987, is the earliest in the southwest of Zhejiang province engaged in water treatment equipment development and production of Professional Company. Is the provincial Environmental Protection Industry Association member units, high-tech enterprises in Zhejiang Province, one of the backbone enterprises of environmental protection industry in province. The company on the domestic and foreign advanced technology at the same time, to research, design, practice improvement, production of sewage treatment in China's advanced sludge dewatering equipment type LW decanter centrifuge series products, the products obtained national patent (Patent No.: 992558446.9). The quality system has been ISO9001 certification enterprises.
The centrifuge is after the filter press and belt filter press, and a new generation of advanced sludge dewatering equipment, in foreign countries is the preferred equipment for sludge dewatering. Compared with the belt machine, has a unique advantage, is embodied:
The centrifuge using centrifugal sedimentation principle, the solid-liquid separation, the existing filter, will not cause blockage, and the solid-liquid separation machine using the filter belt, to prevent clogging of filter belt, need high pressure water scouring;
The centrifuge for various types of sludge thickening and dewatering, belt machine is also applicable to all kinds of sludge, but for oily, viscous, sludge dosage and dehydration is difficult to;
The centrifuge in the dehydration process when the feed concentration, slip and torque of the rotary drum and screw will automatically track the adjustment, so can not set up special operations, and the filter in the dehydration process when the feed concentration, belt speed, belt tension, dosage, flushing water pressure need to adjust, the higher operating requirements;
In the centrifuge, small sludge can separate from water, so the dosage of the flocculant dosage is less, the general mixed sludge dewatering: 1.5kg / t[dry sludge, sludge recovery rate is above 95% after dehydration, the moisture content of the cake is 60% - 85%, but due to the belt filter filter belt not weave too dense, in order to prevent the escape of sludge small, flocculant added more to form a larger floc sludge, mixed sludge dewatering when the dosage is more than 3kg/L (dry sludge), sludge recovery rate is above 90%, dehydrated mud cake moisture content was about 80%;
The sludge dewatering centrifuge per cubic meter of power for the 1kW / m3, the running noise is less than 85dB, 24h all day continuous operation of Chuzhou shutdown operation, do not need to clean water; and the belt machine per cubic meter of sludge dewatering power for 0.8kw / m3, the running noise is 80dB, filter cloth to relaxation maintenance, generally only arranged two classes every day the operation, need to continue cloth washing with high pressure water during operation;
The centrifuge small occupied space, simple installation, equipment only dosing and a discharging conveyor, whole sealing operation, workshop environment; and with large area, in addition to import equipment and dosing conveyor, still need to wash pump, air compressor, sludge regulation and so on, poor sealing machine, high pressure cleaning water and odor pollution of the environment, such as the management is not good, will cause the mud;
The centrifuge parts for bearings and seals, unloading screw conveyor, the repair period is generally 3 years, well-known imported bearings and seals can ensure the equipment running long time high strength, normal maintenance can greatly prolong the repair period; and the belt wearing parts than the number of times the most outer bearing centrifuge, filter belt we also need to be replaced, the price is expensive, flushing pump, air compressor, sludge conditioning also need to maintain, high labor intensity.
The operation cost calculation. In the centrifugal dewatering and belt filter press dewatering operation cost comparison, using the following algorithm:
Such as:
With dosage of 4kg / (t[dry mud "), a single power consumption in 0.8kW / m3 mud, mud flushing water: 1:1; centrifuge dosage to 3kg / (t[dry mud"), a single power consumption in 1.2kW / m3 mud, wash water to 0 meter, electricity 0.5 yuan / kW, charges 0.5 yuan / m3, cost 80 yuan / kg.
With 8 x 104t/d wastewater treatment plant for example, dry sludge is 10t/d, into the mud with 3% solid content (concentrated sludge), the mud volume is 333m3 / D, dehydrated sludge solid content > 20%. The calculated:
Belt type filter press: the cost was 3200 yuan /d; electricity is 133.2 yuan /d; water is 166.6 yuan /d. The operating cost of the machine with e =3200+1332+166.6 = 3499.8 yuan / d.
Decanter: cost was 2400 yuan /d; electricity is 199.8 yuan /d; water is 0 yuan /d; then the centrifuge operation cost for =2599.8 yuan / d.
The difference between operating costs: 900 yuan / D, 1a, 360D, =900 / D * 360d=324000 yuan yuan. 1A with running costs 324000 yuan more than the centrifuge machine.
Therefore, according to the above analysis, draws the following conclusion: the machine is more suitable than the centrifuge centrifuge; because of high separation efficiency, flocculation of sludge than belt machine is low, so low agent consumption, low operation cost and may yield good dehydration effect, recommend the use of horizontal screw centrifugal dewatering machine.
