Rain water on roof recovery processing technique
Technical field
The present invention relates to a kind of rain water on roof recovery processing technique.
Background technology
Along with sharp increase and the rapid economic development of population, shortage of water resources has become whole world problems faced.China is lack of water big country, has expert to point out: after 2010, and China will enter serious water shortage period; The year two thousand thirty, China is by lack of water 400 billion cubic meter to 500 billion cubic meter, and lack of water peak will there will be.Therefore using rainwater as important water resources in addition Collection utilization, become the important channel solving water resources deficiency.
Energy-saving and emission-reduction are the Important Actions of the sustainable development of socio-economy of implementing a scientific outlook on development, realize.According to Minstry of Housing and Urban-Rural Development of People Republic of China's " about implementing < State Council about the embodiment of notice > printing and distributing the comprehensive programme of work of energy-saving and emission-reduction " and " instruction about development housing and public buildings that use less energy and land and public building ", various places have put into effect the instruction of development housing and public buildings that use less energy and land respectively, wherein all have requirement about rainwater catchment system.Along with housing and public buildings that use less energy and land community is built, all kinds of rainwater catchment system technology will be applied.
Urban rainwater is as the valuable water resources of one, and its Collection utilization mainly contains roofing, road, three kinds, the perviousness ground medium that confluxes.And select mainly to consider in water quality, the water yield and later collection processing requirements etc. at the medium that confluxes.Comprehensive, rain water on roof accounts for and has great advantage: one is that water quality is better, without or just can meet the higher purposes of water quality requirement through simply and easy treat, rainwater on road surface pollution load is greatly comparatively speaking, water quality inferiority; Two is that seepage is little, can collect rainfall many because urban region roofing area is huge, and perviousness surface runoff rainwater is substantially based on infiltration comparatively speaking, can collect rainfall limited; Three is that Collection utilization system is simple to operation, and maintenance operation cost is low, and this is good to water quality, measure and be directly proportional greatly; In addition, compared with other water supply project, rain water on roof utilizing works is very little on natural ecological environment impact.In a word, the comprehensive advantage of rain water on roof, making it collect recycling becomes inevitable.
The main technique of ground rainwater treatment of current initial stage is coagulating sedimentation, and its main technique principle utilizes in the body refuse that gathers and former water to contact with each other, adsorb by impurity particle, is aided with flocculation agent and reaches the purification structure that clear water is comparatively fast separated.This kind of technique has that throughput is high, the good advantage for the treatment of effect, but be also subject to the impact of the factors such as raw water quality, water temperature and coagulating agent, requirement for pending water source is higher, and is generally used for ground rainwater collection, is not suitable for the process of rain water on roof.Along with the raising of state of the art, the treatment process of early-stage rainwater also gets more and more.
The application of current early-stage rainwater treatment process in roof rainwater collection and recycling field is also rather limited to.
Summary of the invention
Technical problem to be solved by this invention is to overcome the defect that existing early-stage rainwater treatment process is not suitable for rain water on roof, provides a kind of new rain water on roof recovery processing technique.Recovery processing technique of the present invention can carry out removal of impurities and degerming to rain water on roof well, and the rainwater after process can be used for the reclaimed waters such as green area irrigation, road cleaning, carwash.Meanwhile, recovery processing technique of the present invention can carry out water treatment continuously, and water outlet is good, and technical process is simple, and Construction and operation cost is lower, can realize automatization, administer and maintain cost low, has fabulous application prospect and environment-friendly advantage.
The invention provides a kind of rain water on roof recovery processing technique, it comprises the steps: to collect rain water on roof, carry out rain early-stage split-flow, rainwater remaining after abandoned stream is mixed with polymerize aluminum chloride and carries out coagulating, filter after precipitation process, rainwater after filtration is mixed with disinfection sanitizer and carries out sterilization and disinfection process; Wherein, described disinfection sanitizer is organic chloride aluminium ECH-98.
Wherein, described rain water on roof collect the various rainwater catchment modes that can adopt this area routine, the mode preferably by hydrocone type pressure current is carried out.
Wherein, the abandoned stream amount of described initial Split-flow is determined according to the concentration of the pollutent such as COD, BOD, SS, colourity of collected rainwater, and the COD value (chemical oxygen demand (COD)) of rainwater remaining after preferably making abandoned stream is 80 ~ 180mg/L; BOD value (five-day BOD) is 15 ~ 40mg/L; SS (in water quality suspended substance) is 20 ~ 100mg/L, preferably 40 ~ 100mg/L; Colourity is 40 ~ 100 times, preferably 80 ~ 100 times.Described initial Split-flow general abandoned stream 2 ~ 3mm runoff thickness.
Wherein, described rain early-stage split-flow can adopt various initial Split-flow device in this area to carry out, and preferably adopts rainwater automatic diverter in the present invention.Described rainwater automatic diverter adopts cyclonic separation principle to carry out rain early-stage split-flow usually, to control by time variable discharge quantity of initial rainwater by changing screen area and order number.The rain water on roof collected tangentially flows into the eddy flow screen cloth in rainwater automatic diverter.At the rainfall initial stage, because described screen surface is dry, under the surface tension and the effect of the screen cloth gradient of water, the rain water on roof collected in screen surface with the water shoot of the state flow of eddy flow to center, early-stage rainwater pours municipal Storm Sewer Network with foreign material such as the leaves remained on screen cloth, realizes the self cleaning of rain early-stage split-flow and rainwater automatic diverter.Along with the continuity of rainfall, screen surface is constantly infiltrated, and the tension force effect of rainwater in the screen surface infiltrated will reduce greatly, and middle and later periods rainwater will be pooled to the rainwater-collecting pipeline in rainwater automatic diverter through screen cloth.
Wherein, the rainwater collected enters described rainwater automatic diverter by downcomer.
Wherein, the dosage in the rainwater that described polymerize aluminum chloride is remaining after abandoned stream is the conventional dosage of this area, is preferably 5 ~ 6mg/L.
Wherein, the time of described coagulating is the conventional coagulation time of this area, is preferably 20 ~ 40min.
Wherein, described precipitation process adopts the precipitation treatment method of this area routine, generally carries out in rainwater settling tank.The time of described precipitation process is the conventional sedimentation time of this area, is preferably 1 ~ 2h.
Wherein, described filtration can adopt the filter type of this area routine to carry out, and preferably adopts sand filters.Described sand-bed filter can adopt the sand-bed filter for filtering water body of various routine in this area.The filtering velocity of described sand-bed filter is the conventional filtering velocity of this area, is preferably 6m
3/ m
2h ~ 10m
3/ m
2h.The work period of described sand-bed filter is preferably 8h ~ 12h, and after reaching this work period, sand-bed filter can carry out back flushing automatically, realizes automatic pollution discharge.
Wherein, described ECH-98 is commercial goods, and manufacturer is Xiba Sci. & Tech. Co., Ltd., Shanghai.Dosage in described ECH-98 rainwater is after filtration preferably 0.2 ~ 0.5mg/L.The time of described sterilization and disinfection process is preferably 0.5h ~ 1.0h.
In the present invention one preferably embodiment, the concrete operations of described rain water on roof recovery processing technique comprise: with the mode Accumulated Rainwater of hydrocone type pressure current, by downcomer, the rainwater collected is carried out rain early-stage split-flow through rainwater automatic diverter, rainwater remaining after abandoned stream enters rain water reservoir, promote through lift pump, described polymerize aluminum chloride is added by the first chemicals dosing plant be arranged on this lift pump rising pipe, rainwater containing polymerize aluminum chloride enters settling tank and carries out precipitation process, after sand filters, add described disinfection sanitizer by the second chemicals dosing plant and carry out sterilization and disinfection process, enter rainwater clean water basin subsequently to store, .
In the present invention, treated rain water on roof can reach miscellaneous domestic water quality standard CJ25.1-89:COD≤50mg/L, BOD≤10mg/L, SS (in water quality suspended substance)≤10mg/L, colourity≤30 times, turbidity < 5, can be used in the reclaimed waters such as green area irrigation, road cleaning, carwash.
In the present invention agents useful for same and raw material except specified otherwise all commercially.
In the present invention, on the basis meeting this area general knowledge, above-mentioned each technical characteristic optimum condition arbitrary combination can obtain preferred embodiments.
Positive progressive effect of the present invention is:
1, rain water on roof recovery processing technique of the present invention can process rain water on roof, makes it reach miscellaneous domestic water quality standard, thus realizes the recycling of rainwater, drastically increases rainwater utilization, meets environmental requirement.
2, recovery processing technique of the present invention can carry out water treatment continuously, and water outlet is good, simple flow, and Construction and operation cost is lower, can realize automatization, and management is simple, administers and maintains cost low, is easy to promote the use of, have fabulous application prospect.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of rainwater recycle treatment process of the present invention.
Embodiment
Mode below by embodiment further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.
Water-quality control national standard CJ25.1-89:COD≤50mg/L, BOD≤10mg/L, SS (in water quality the suspended substance)≤10mg/L of reclaimed water, colourity≤30 times, about turbidity≤5.
In following embodiment, the detection method of COD, SS and colourity all performs by national standard:
COD examination criteria is GB/T11914-1989 (dichromate titration mensuration water chemical oxygen demand);
BOD examination criteria is GB7488-87 (water quality five-day BOD BOD5);
SS examination criteria is GB11901-1989 (gravimetric determination water quality suspended substance);
Colorimetric detection standard is GB/T11903-1989 (measuring water quality colourity).
Sterilant ECH-98: Xiba Sci. & Tech. Co., Ltd., Shanghai.
Polymerize aluminum chloride: Xiba Sci. & Tech. Co., Ltd., Shanghai.
Embodiment 1
Carry out producing test (see Fig. 1) as a trial to the rain water on roof that certain community produces.
(1) rain water on roof is collected by hydrocone type downcomer, carry out entering rain water reservoir after initial Split-flow through rainwater automatic diverter, discharge quantity of initial rainwater is 3mm runoff thickness, rainwater index after initial Split-flow is: COD is 140 ~ 180mg/L, BOD is 30 ~ 40mg/L, SS is 80 ~ 100mg/L, and colourity is 100 times;
(2) rainwater promotes through lift pump and enters rainwater settling tank, the rising pipe of lift pump is installed the first chemicals dosing plant, add polymerize aluminum chloride, dosage is 6mg/L, carries out precipitation process (time is 2h) while carrying out coagulating (reaction times is 40min);
(3) with sand filters, (filtering velocity is 10m
3/ m
2h, the work period is 12h) after add disinfection sanitizer ECH-98 by the second chemicals dosing plant and carry out sterilization and disinfection process, disinfection sanitizer dosage is 0.5mg/L, and disinfection time is 30min, and the rainwater handled well enters rainwater clean water basin and stores.
Start-up and functionning result shows, and this system run all right, treatment effect is fine.
After testing, the rainwater COD handled well is 35 ~ 45mg/L, BOD is 6 ~ 8mg/L, SS (in water quality suspended substance) is 7 ~ 9mg/L, colourity is 25 times, turbidity < 5, reaches the Water-quality control CJ25.1-89 national standard of reclaimed water.
Embodiment 2
Carry out producing test (Fig. 1) as a trial to the rain water on roof that certain community produces.
(1) rain water on roof is collected by hydrocone type downcomer, carries out entering rain water reservoir after initial Split-flow through rainwater automatic diverter, and discharge quantity of initial rainwater is 2mm runoff thickness; The index of the rainwater after initial Split-flow is: COD is 100 ~ 140mg/L, BOD be 25 ~ 35mg/L, SS is 60 ~ 80mg/L, and colourity is about 90 times;
(2) rainwater promotes through lift pump and enters rainwater settling tank, the rising pipe of lift pump is installed the first chemicals dosing plant, add polymerize aluminum chloride, dosage is 5mg/L, carries out precipitation process (time is 1.5h) while carrying out coagulating (reaction times is 30min);
(3) with sand filters, (filtering velocity is 8m
3/ m
2h, the work period is 10h) after add disinfection sanitizer ECH-98 by the second chemicals dosing plant and carry out sterilization and disinfection process, disinfection sanitizer dosage is 0.3mg/L, and disinfection time is 40min, and the rainwater handled well enters rainwater clean water basin and stores.
Start-up and functionning result shows, and this system run all right, treatment effect is fine.
After testing, the rainwater COD handled well is 25 ~ 35mg/L, BOD is 6 ~ 8mg/L, SS (in water quality suspended substance) 8 ~ 9mg/L, and colourity is 20 times, turbidity < 5, reaches the Water-quality control CJ25.1-89 national standard of reclaimed water.
Embodiment 3
Carry out producing test (see accompanying drawing 1) as a trial to the rain water on roof that certain community produces.
(1) rain water on roof is collected by hydrocone type downcomer, carries out entering rain water reservoir after initial Split-flow through rainwater automatic diverter, and discharge quantity of initial rainwater is 2mm runoff thickness; The index of the rainwater after initial Split-flow is: COD is 80 ~ 100mg/L, BOD be 15 ~ 25mg/L, SS is 40 ~ 60mg/L, and colourity is about 80 times.
(2) rainwater promotes through lift pump and enters rainwater settling tank, the rising pipe of lift pump is installed the first chemicals dosing plant, add polymerize aluminum chloride, dosage is 5mg/L, carries out precipitation process (time is 1.5h) while carrying out coagulating (reaction times is 40min);
(3) with sand filters, (filtering velocity is 6m
3/ m
2h, the work period is 8h) after add disinfection sanitizer ECH-98 by the second chemicals dosing plant and carry out sterilization and disinfection process, disinfection sanitizer dosage is 0.5mg/L, and disinfection time is 50min, and the rainwater handled well enters rainwater clean water basin and stores.
Start-up and functionning result shows, and this system run all right, treatment effect is fine.
After testing, the rainwater COD0mg/L handled well, BOD < 10mg/L, SS (in water quality suspended substance) < 10mg/L, colourity < 30 times, turbidity < 5, reaches the Water-quality control CJ25.1-89 national standard of reclaimed water.