CN103866846B

CN103866846B - Primary rainwater separation method

Info

Publication number: CN103866846B
Application number: CN201410059679.1A
Authority: CN
Inventors: 周超; 何锐
Original assignee: Wuhan Shengyu Drainage Systems Co Ltd
Current assignee: Wuhan Shengyu Smart Ecological Environmental Protection Co ltd
Priority date: 2014-02-21
Filing date: 2014-02-21
Publication date: 2015-06-17
Anticipated expiration: 2034-02-21
Also published as: CN103866846A

Abstract

The invention discloses a primary rainwater separation method. The primary rainwater separation method comprises the following steps: 1) defining primary rainwater, wherein the primary rainwater is defined to be ground runoff produced by former Xmm rainfall from the time that rainfall forms ground runoff; 2) calculating primary raining time T: starting to collect rainfall in a rainwater collection area outside a catch basin and simultaneously counting the time when the rainfall forms the ground runoff after rainfall, stopping counting the time when ground runoff depth reaches Xmm, determining the period of time as t1 and determining runoff time from the farthest end of the rainwater collection area to the closest rainwater inlet as t2, wherein T=t1+t2; 3) catching the primary rainwater: catching the ground runoff in the catch basin within the period from the time that the ground runoff is formed to the end of the primary raining time T and separating out the ground runoff. The primary rainwater separation method has the advantages that since the primary rainwater range is defined and the primary rainwater is measured from the angle of the ground runoff, the accurate catch of the primary rainwater is realized, the problem that the primary rainwater is difficult to measure all the time is solved, the primary rainwater is prevented from polluting natural water bodies and the stresses of rainwater regulating storage tanks and sewage treatment plants are relieved.

Description

Early-stage rainwater separation method

Technical field

The present invention relates to rainwater reuse technology, refer to a kind of early-stage rainwater separation method particularly.

Background technology

Along with increasing of urban atmospheric pollution and ground pollution, rainwater runoff pollution is further serious, especially the early-stage rainwater (being called for short just rain) that pollutant is more, according to investigations, the pollutant index peak of the first rain in some area is with far away higher than typical urban sanitary sewage, therefore it is very necessary for carrying out collecting process for first rain, and first rain is separated by these needs from rainwater.

In separation just this process of rain, if just rain is separated insufficient, will produces natural water and pollute, if the just rain that dams is too much, waste and the irrational use of storm detention tank limited resources will be caused, require also very high to Sewage Plant treating capacity in addition.Current first rain isolation technics is all based on fuzzy extensive metering, and rule of thumb consider from time angle the definition of first rain is many at present, in relevant report, first rain is defined as first 5 minutes, 10 minutes, 15 minutes, 20 minutes have, because first rain is from environment and water quality angle, affect the many factors of environment and water quality, determine that the way of just rain scope is inappropriate with a regular time separately.Therefore, how to determine just rain scope, and then accurately dam to be separated to first rain and just become technical problem urgently to be resolved hurrily.

Summary of the invention

Object of the present invention will provide a kind of early-stage rainwater separation method exactly, and the method carries out accurate measurement to first rain, thus realizes accurately damming to first rain.

For achieving the above object, the technical solution used in the present invention is: a kind of early-stage rainwater separation method, comprises the following steps:

1) definition just rain: from rainfall forms surface runoff, the surface runoff amount that front Xmm rainfall produces;

2) calculate just rain duration T: after rainfall, when rainfall produces surface runoff, the receipts pool started outside catchpit is collected rainfall, and is started timing simultaneously, and when local face height of run-off reaches Xmm, stop timing, this period is t1; The distalmost end in described receipts pool is t2, then T=t1+t2 apart from the flow-through period of nearest inlet for stom water;

3) dam just rain: being dammed by the surface runoff terminated during this period of time to first rain duration T from during generation surface runoff in described catchpit, separate.

Further, described step 2) in, in catchpit, non-irrigated flowing water position is H1, when the water level in catchpit exceedes non-irrigated flowing water position H1, now starts to collect rainfall in receipts pool, and starts timing simultaneously.

Further, described step 2) in, in receipts pool, rainfall collected by rain ga(u)ge glass, floss hole established by described rain ga(u)ge glass, when starting timing, closes described floss hole and start to collect rainfall, at the end of first rain duration T, open described floss hole, in rain ga(u)ge glass, rainwater is discharged and is resetted.

Further, described step 2) in, X is 11 ~ 14, t2 is 4 ~ 6 seconds.

Further, in described step 1), X is 12.5.

Further, the non-irrigated flowing water position H1 in described catchpit gets the water level maximum value that in a year, the non-irrigated stream phase is corresponding.

According to rinsing principle, the ratio that ground pollutant is taken away and surface runoff amount substantially proportional, therefore the present invention defines just rain scope from the angle of surface runoff amount, the height of run-off Xmm just corresponding to rain to be separated is pre-determined according to regional environmental factor and draining water quality standard, during rainfall, within the period forming this height of run-off Xmm, that is: terminate to dam collections to the surface runoff produced during this period of time to first rain duration T from when producing surface runoff, thus rain at the beginning of with serious pollution is separated from rainwater; The present invention has carried out accurate measurement to first rain, thus achieves accurately damming of first rain, and what solve just rain existence all the time is difficult to measurement problem, avoids just rain and, to the pollution of natural water, also alleviates the pressure of storm detention tank and Wastewater Treatment Plant; The present invention is that rainwater recycle utilization provides good Process ba-sis, is conducive to the Appropriate application of resource.

Detailed description of the invention

Below in conjunction with specific embodiment, the present invention is described in further detail.

A kind of early-stage rainwater separation method, comprises the following steps:

1) definition just rain: the surface runoff amount that before forming surface runoff from rainfall, Xmm rainfall produces, X value presets according to regional environmental factor and draining water quality standard, is preferably 11 ~ 14.

2) calculate just rain duration T: catchpit is set, the non-irrigated flowing water position wastewater level that to be H1(H1 be in catch basin in catchpit, available liquid level sensor obtains signal, if there is fluctuation this non-irrigated flowing water position, the water level maximum value that in desirable 1 year, the non-irrigated stream phase is corresponding), after rainfall, when the water level in catchpit exceedes non-irrigated flowing water position H1, start to control rain ga(u)ge glass in receipts pool and collect rainfall, and (rainfall also not producing surface runoff is not counted in just rain to start timing simultaneously, water level in catchpit is just rain and produces the surface runoff moment when exceeding non-irrigated flowing water position H1, and a bit having produced footpath flow to catch basin recently now to receive water area region, first rain starts time-count cycle), when in rain ga(u)ge glass, rainwater height reaches Xmm, stop timing, this period is t1, the distalmost end in described receipts pool is t2, t2 preferably 4 ~ 6 seconds apart from the flow-through period of described nearest inlet for stom water, then T=t1+t2.

Wherein, rain ga(u)ge glass need be placed on the receipts aqua region outside catchpit control room, an electromagnetic valve is housed bottom this rain ga(u)ge glass, also be provided with a little floss hole, this electromagnetic valve is open type, when drought stream for often to open, when early-stage rainwater starts timing, closed electromagnetic valve, when the water level in rain ga(u)ge glass reaches Xmm, time delay t2(t2 is also needed to receive the surface runoff time of pool distalmost end to inlet for stom water, namely pool distalmost end is received to nearest inlet for stom water surface runoff time and storm sewer flow-through period sum, also the surface runoff namely produced flows to the time needed in catchpit, this time determines according to the landforms situation receiving pool), at the end of first rain time T, electromagnetic valve is opened, rain ga(u)ge glass rainwater is discharged from floss hole and is resetted.

3) dam just rain: being dammed by the bottom surface runoff terminated during this period of time to first rain duration T from during generation surface runoff in described catchpit, being separated by first rain, be delivered to Wastewater Treatment Plant from rainwater; Rain duration T arrived originally, and damming of first rain just can stop, and later stage clean Water in Rainwater Drainage is to natural water.

Embodiment 1

Just rain is defined as by forming the surface runoff amount that before after surface runoff, 12.5mm rainfall produces from rainfall; Catchpit is set, in catchpit, non-irrigated flowing water position is H1, this non-irrigated flowing water position H1 gets the water level maximum value that in a year, the non-irrigated stream phase is corresponding, after rainfall, when the water level in catchpit exceedes non-irrigated flowing water position H1, rainfall collected by the receipts pool rain ga(u)ge glass now started outside catchpit, and start timing simultaneously, when rainwater height reaches 12.5mm in rain ga(u)ge glass, stop timing, to collect when rainwater height in rainfall to rain ga(u)ge glass reaches 12.5mm be 15 minutes during this period of time; The distalmost end in described receipts pool is 5 seconds apart from the flow-through period of nearest inlet for stom water, then just rain duration be after timing 15 points 5 seconds; In described catchpit by water level more than H1 after 15 points of rainwater water inlets in 5 seconds dam to get off, be delivered to Wastewater Treatment Plant and carry out purified treatment.

Claims

1. an early-stage rainwater separation method, comprises the following steps:

Step 1) definition just rain: from rainfall forms surface runoff, the surface runoff amount that front Xmm rainfall produces;

Step 2) calculate just rain duration T: after rainfall, when rainfall produces surface runoff, the receipts pool started outside catchpit is collected rainfall, and is started timing simultaneously, and when local face height of run-off reaches Xmm, stop timing, this period is t1; The distalmost end in described receipts pool is t2, then T=t1+t2 apart from the flow-through period of nearest inlet for stom water;

Step 3) dam just rain: the surface runoff terminated during this period of time to first rain duration T from during generation surface runoff being dammed in described catchpit, separate.

2. early-stage rainwater separation method according to claim 1, it is characterized in that: described step 2) in, in catchpit, non-irrigated flowing water position is H1, when the water level in catchpit exceedes non-irrigated flowing water position H1, now start to collect rainfall in receipts pool, and start timing simultaneously.

3. early-stage rainwater separation method according to claim 1 and 2, it is characterized in that: described step 2) in, in receipts pool, rainfall collected by rain ga(u)ge glass, floss hole established by described rain ga(u)ge glass, when starting timing, close described floss hole and start to collect rainfall, at the end of first rain duration T, open described floss hole, in rain ga(u)ge glass, rainwater is discharged and is resetted.

4. early-stage rainwater separation method according to claim 1, is characterized in that: described step 2) in, X is 11 ~ 14, t2 is 4 ~ 6 seconds.

5. the early-stage rainwater separation method according to claim 1 or 4, is characterized in that: described step 1) in, X is 12.5.

6. early-stage rainwater separation method according to claim 2, is characterized in that: the non-irrigated flowing water position H1 in described catchpit gets the water level maximum value that in a year, the non-irrigated stream phase is corresponding.