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Method and device for treating domestic sewage from villages and towns

A technology for sewage treatment equipment and domestic sewage, which is applied in biological water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Improve water treatment costs and other issues to achieve the effect of shortening start-up time, simple structure and stable operation

Inactive Publication Date: 2012-10-24
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small scale of "Nongjiale", there is a lack of effective sewage treatment facilities, and the problem of water pollution has not been solved.
This treatment method is complicated in process and inconvenient to maintain. The capillary infiltration system is easy to block, which increases maintenance costs and further increases water treatment costs.

Method used

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  • Method and device for treating domestic sewage from villages and towns
  • Method and device for treating domestic sewage from villages and towns
  • Method and device for treating domestic sewage from villages and towns

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The domestic sewage is collected from a rural area in Beijing, and the COD (chemical oxygen demand) of the sewage is 400-500mg·L -1 , the turbidity is 90-120NTU, the total nitrogen (TN) concentration is 100-130mg·L -1 , the concentration of total phosphorus (TP) is 5-10mg·L -1 , ammonia nitrogen (NH 4 + -N) concentration is 65-78mg·L -1 , the water volume is 3.0-4.5m 3 / d, the operating temperature during sewage treatment is 25-35°C; the flocculant is inorganic polyaluminum chloride, and the flocculant contains 5% Al 3+ (in Al 2 o 3 count). The average COD of domestic sewage is 450mg·L -1 , the average value of turbidity is 105 NTU, and the average value of total nitrogen concentration is 115mg·L -1 , The average value of total phosphorus concentration is 7.5mg·L -1 , The average value of ammonia nitrogen concentration is 71.5mg·L -1 .

[0081] 1) Mixing of raw water and flocculant

[0082] The domestic sewage stored in the raw water tank 1 flows into the m...

Embodiment 2

[0104] The domestic sewage is collected from a rural area in Beijing, and the COD (chemical oxygen demand) of the sewage is 900-1200mg·L -1 , the turbidity is 90-120NTU, the total nitrogen concentration is 100-130mg·L -1 , the total phosphorus concentration is 5-10mg·L -1 , the concentration of ammonia nitrogen is 65-78mg·L -1 Domestic sewage, the water volume is 3.0-4.5m3 / d.

[0105] Except that the flocculant is polyaluminum chloride, the flocculant contains 5% Al 3+ (in Al 2 o 3 meter), the dosage of flocculant is 0.80mmol / L (as Al 3+ ), that is, the weight of aluminum ions added to the flocculant per liter of influent water is 21.6mg; the hydraulic retention time (HRT) of sewage in the anaerobic baffle reactor 6 is 12h; The filling height of medium pebbles is 250mm; the filling height of large-sized volcanic rocks is 150mm; the filling height of small-sized volcanic rocks is 250mm; the filling height of ceramsite is 250mm; 20000mg / L, Fe content is 30g / kg, Al conten...

Embodiment 3

[0109] Except that the operating temperature in the domestic sewage treatment process is 10-20°C; the flocculant is polyaluminum chloride, and the flocculant contains 15% Al 3+ (in Al 2 o 3 meter), the dosage of flocculant is 0.25mmol / L (as Al 3+ ), that is, the weight of aluminum ions added to flocculant per liter of influent water is 6.75mg; the hydraulic retention time (HRT) of sewage in anaerobic baffle reactor 6 is 5h; during artificial subsurface flow wetland treatment, filler 11 The filling height of medium pebbles is 200mm; the filling height of large-sized volcanic rocks is 200mm; the filling height of small-sized volcanic rocks is 375mm; the filling height of ceramsite is 200mm; 15000mg / L; the planting density of emergent plants 10 is 9 plants / m 2 The planting ratio of emergent plants Phragmites reed, Iris chrysanthemum, cattail, water onion and water calamus is 4: 2: 2: 1: 2; the hydraulic retention time of sewage in subsurface wetland is 1.5d, other is identical...

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Abstract

The invention discloses a method and a device for treating domestic sewage from villages and towns. The method for treating domestic sewage from villages and towns comprises the following steps of feeding domestic sewage from villages and towns orderly through a grading multiphase anaerobic unit for enhanced biological granulation, so that the chemical oxygen demand (COD) in the domestic sewage is eliminated, and binding a subsurface flow wetland unit for enhanced phosphorous removal with a plant by a filling material so that phosphorous sorption and adsorption, ammonia nitrogen nitration and particle filtration interception are finished. A porous filling material in the grading multiphase anaerobic unit can cooperate with an enhanced biological granulation process so that granule sludge formation is accelerated and load treatment and impact resistance capacities of the grading multiphase anaerobic unit are improved. Through tap water sludge and reasonable plant configuration in the subsurface flow wetland unit, effects of removing nitrogen, phosphor and particles are improved. The device suitable for the method comprises a water pump, a blending tank, a flowmeter, the grading multiphase anaerobic unit and the subsurface flow wetland unit. The method for treating domestic sewage from villages and towns has good effects of removing organic matters in domestic sewage, a relatively small floor space, a low operation cost and simple processes.

Description

technical field [0001] The invention relates to a multistage water treatment method and equipment thereof, in particular to a water treatment method and equipment for domestic sewage in villages and towns. Background technique [0002] "Nongjiale" is a form of tourism that emerged in the mid-1990s. It meets the tourism consumption needs of urban residents and accelerates the process of urban-rural integration. One share of "Nongjiale" is voluntarily invested by local farmers, and the scale is relatively small. Due to the nature of tourism, its tourist sources are generally concentrated in holidays and March-April, while winter is the off-season for tourism. With the vigorous development of "farmhouse" as a form of tourism, the problem of water pollution in villages and towns is becoming more and more serious. However, due to the small scale of the "Nongjiale" group, there is a lack of effective sewage treatment facilities, and the problem of water pollution has not been re...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/28C02F3/32C02F3/34
CPCY02W10/10
Inventor 王毅力冯晶梁文艳豆小敏
Owner BEIJING FORESTRY UNIVERSITY
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