Summary of the invention
The objective of the invention is on traditional wastewater treatment process and Equipment Foundations, exploitation is fit to method and the suite of equipment of Small Urban sewage disposal, and makes it have simple and convenient operation and maintenance, running cost is low and treatment effect is stable characteristics.
Technical scheme of the present invention is: the centralized domestic sewage processing method of Small Urban, a kind of improvement type domestic sewage processing method and equipment, may further comprise the steps: 1), the spiral-flow aeration sand setting, spiral-flow aeration is set in settling pit, the sewage of the living horizontal flow velocity 0.2 ~ 0.3m/s of intaking, hydraulic detention time 40 ± 10s, available depth 1.0 ± 0,2m is along water (flow) direction, the single tube aerating apparatus is established in the pool wall both sides, increase the collision of suspended substance in the sanitary sewage water inlet, reduce organic content in the sand setting, and organic particulate matter is played certain crushing effect, original a large amount of microorganism is under the aeration effect in the water inlet, tentatively organism in the degraded water inlet reduces subsequent disposal facility hydraulic detention time approximately, the economy system investment; 2), (pretreatment section) carry out Sludge Bed and filter, flow rate control is at 0.4 ~ 0.7m/h.Sanitary sewage is through Sludge Bed in the sludge thickener, and suspended substance is further removed, and certain shock absorption is played in variation to influent quality.Water inlet is stirred and is taken away the sludge anaerobic aerogenesis, prevents mud caking floating; 3), aerobic section adopts immersion alga type (tubular fibre the other end free state) hollow fiber ultrafiltration membrane technique, centrifugation by tunica fibrosa is trapped in active sludge in the reactor, save the system sludge backflow, sludge concentration in the Effective Raise equipment, relative reduce the entering organic matter of water biological load, namely improved the equipment anti-shock portative power; 4), aerobic section adopts the subregion aeration, makes to form aerobic zone and aerobic area in the pond in, sewage forms circulation in reactor, improve the clearance of ammonia nitrogen in intaking; 5), the sterilization of effluent adopting ultraviolet irradiation, raising germ-killing efficiency and the secondary pollution of avoiding medicament disinfecting to cause.
The present invention can pass through the on-line monitorings such as liquid level, dissolved oxygen in conjunction with the PLC automatic control, and the start and stop of control pump and adjusting blower fan wind supply quantity are realized unattended.
But horizontal flow type grit chamber or other improvement type settling pit are staggered.Aeration intensity is controlled at 2 ~ 3m
3/ m
2Min or every cube of sewage 0.08 ~ 0.12m
3, make sewage form strong turbulent flow, collision between the particulate matter increases, the removal that rubbed of the organism of sand grain surface.
Sludge Bed is filtered
Settled sludge forms good sludge blanket in the sludge thickener under action of gravity, sewage enters at concentration basin 1/4 ~ 1/3 At The Height, be evenly distributed on whole aspect by water-distributing device, pass sludge blanket from bottom to top, larger suspended substance can be held back and remove by sludge blanket, removes to be partly dissolved organic matter.
Aerobic section subregion aeration, form aerobic section and anaerobism Duan Bingcun, namely utilize vertical partition plate that aerobic section is divided into two zones, and keep the upper and lower to be interconnected, form aerobic zone at a side aeration, opposite side is the non-aeration district, and simultaneously under the effect of the lifting of aeration and dividing plate, two zones form circulation.The aerobic zone muddy water mixed solution enters opposite side non-aeration district, and dissolved oxygen exhausts rear formation aerobic area, for favourable condition has been created in denitrogenation.
The aerobic zone Dissolved Oxygen concentration Control is at 1.5 ~ 2.0mg/L, and aeration intensity is 5 ~ 8m
3/ m
2H, the volumetric ratio of aerobic zone and aerobic area is 1:3 ~ 1:2.
The invention has the beneficial effects as follows: centralized sewage treatment unit adopting process is fit to Small Urban waste water control demand, and is easy and simple to handle, be easy to apply, and helps to improve the Small Urban sanitary sewage and lacks the present situation of effectively administering.By process modification, reduce cost of sewage disposal.Process stable effluent quality, reach the reclaimed water water quality requirement, but direct reuse is alleviated regional short water supply.
Embodiment
1) spiral-flow aeration sand setting
Adopt horizontal flow type grit chamber simple in structure to improve horizontal flow velocity 0.2 ~ 0.3m/s, hydraulic detention time 40s, available depth 1.0m.Along water (flow) direction, the single tube aerating apparatus is established in the pool wall both sides, is staggered.Aeration intensity is controlled at 2 ~ 3m
3/ m
2, make sewage form strong turbulent flow, collision between the particulate matter increases, the removal that rubbed of the inorganics of sand grain surface.
2) Sludge Bed is filtered
Settled sludge forms good sludge blanket in the sludge thickener under action of gravity, sewage enters at concentration basin 1/4 ~ 1/3 At The Height, be evenly distributed on whole aspect by water-distributing device, pass sludge blanket from bottom to top, flow rate control is at 0.4 ~ 0.7m/h, larger suspended substance can be held back and remove by sludge blanket, and mud also has certain adsorption, removes to be partly dissolved organic matter.Muddy water mixed solution has good shock absorption in the sludge thickener simultaneously, can reduce the influent quality fluctuation to the impact of subsequent treatment section.
3) aerobic section half range aeration forms aerobic section and anaerobism Duan Bingcun, improves denitrification effect
Utilize dividing plate that aerobic section is divided into two zones, and keep the upper and lower to be interconnected, form aerobic zone at a side aeration, under the effect of the lifting of aeration and dividing plate, two zones form circulation simultaneously.The aerobic zone muddy water mixed solution enters opposite side, loses air supply, and dissolved oxygen exhausts rear formation aerobic area, for favourable condition has been created in denitrogenation.The nitrification and denitrification denitrogenation that sewage removes to finish in the alternate cycles process ammonia nitrogen in aerobic zone and anaerobism.The aerobic zone Dissolved Oxygen concentration Control is at 1.5 ~ 2.0mg/L, and aeration intensity is 5 ~ 8m
3/ m
2H, the volumetric ratio of aerobic zone and aerobic area is 1:3 ~ 1:2.
4) disinfection by ultraviolet light
The ultraviolet ray of wavelength about 260nm has stronger deactivation to bacterium, can avoid adding strong oxidizing property
Sterilant causes secondary pollution, and reduces the sterilization expense.The uv sterilisation set of time is 5s.
5) automatization control
Combine with equipment interlocking and PLC time variable control by on-line monitoring equipment such as liquidometer, dissolved oxygen instruments, the running status of the equipment such as pump and blower fan in the control waste disposal plant, especially adjust the aeration air quantity, reach the purpose of automated system operation and saving running cost.
The process of processing is as follows:
Enter sludge thickener behind the sanitary sewage process spiral-flow aeration sand setting, under the crown_interception of sludge blanket, further remove the suspended substance in the water inlet.The water outlet of concentration basin top enters Aerobic Pond, is removed at the aerobic zone organism, and mineralized nitrogen is nitric nitrogen simultaneously.At aerobic area, nitric nitrogen is converted into nitrogen and overflows under the denitrifying bacteria effect.By membrane sepn, aerobic section water outlet reuse behind uv sterilisation.
The mud that aerobic section produces regularly enters sludge thickener through sludge pump, deals carefully with after the dehydration of sludge thickener spoil disposal.
Embodiment 1
Design 50m
31 of the sewage treatment unit of/h processing power is used for certain commercial building sanitary sewage disposal, floor space 150m
2, process forward backward averaging water quality as follows.
Service data shows, centralized sewage treatment unit is all higher to the clearance of turbidity, BOD5, ammonia nitrogen and amount of total colibacillus, processes effluent quality and reaches urban life miscellaneous water water quality standard, being back to flush the toilet and the vehicle flushing.
Device moves 30 days continuously, and installing total power consumption variable is 10440kW.h, and the conversion average current drain is 0.29kW.h/ ton water.
Embodiment 2
Design 100m
31 of the sewage treatment unit of/h processing power is used for certain residential area sanitary sewage disposal, floor space 270m
2, process forward backward averaging water quality as follows.
Process effluent quality and reach urban life miscellaneous water water quality standard, be back to subdistrict greening and flushing supply.
Device moves 30 days continuously, and installing total power consumption variable is 21600kW.h, and the conversion average current drain is 0.30kW.h/ ton water.
Embodiment 3
Design 60m
31 of the sewage treatment unit of/h processing power is used for certain residential area sanitary sewage disposal, floor space 180m
2, process forward backward averaging water quality as follows.
Process effluent quality and reach urban life miscellaneous water water quality standard, be back to subdistrict greening and flushing supply.
Device moves 30 days continuously, and installing total power consumption variable is 13392kW.h, and the conversion average current drain is 0.31kW.h/ ton water.
By embodiment as can be known, the centralized sewage treatment unit of Small Urban disclosed by the invention has broad application prospects, and can remove preferably the BOD in the town domestic sewage
5, the principal pollutant such as turbidity, bacterium and ammonia nitrogen, and realize effluent reuse.Level of automation is high, stable effluent quality, and the current consumption that moves with conventional treatment method and equipment compares, and average current drain can reduce about 10%.The large-scale promotion of present technique is used, and is significant.