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Roof rainwater recovery treatment process

A technology for recovery and treatment of rainwater, which is applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of unsuitable roof rainwater and improve the utilization rate of rainwater , Low construction and operation costs, good water output

Active Publication Date: 2013-07-03
SHANGHAI EMPEROR OF CLEANING HI TECH
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  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps recover unused or polluted rainwater from household waste streams that have high levels of suspending substances like sediment. It also makes it possible to re-use this recovered rainwater without causing harmful contamination on our environment by removing unwanted materials such as pesticides residues, fertilizers, dirt particles, etc., which could cause health issues if they were released into rivers or lakes during landscaping activities.

Problems solved by technology

There was no technical solution proposed earlier during this patented research program aimed at improving the efficiency of capturing and reusing storm waters from populated regions like China while addressing issues associated with existing systems. Current solutions involve either coagulating precipitation alone (CWA) or combining different techniques together. However, these processes may affect both fresh water supplies and waste management efforts.

Method used

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  • Roof rainwater recovery treatment process

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A trial production test was carried out on the roof rainwater generated in a residential area (see figure 1 ).

[0037] (1) The rainwater on the roof is collected through the siphon downpipe, and then enters the rainwater storage tank after the initial waste flow through the rainwater automatic diversion device. The initial waste flow of rainwater is 3mm runoff thickness, and the rainwater index after the initial waste flow is: COD is 140~180mg / L, BOD is 30-40mg / L, SS is 80-100mg / L, chroma is 100 times;

[0038] (2) The rainwater is lifted into the rainwater sedimentation tank through the lifting pump, and the first dosing device is installed on the outlet pipe of the lifting pump, and polyaluminum chloride is added, and the dosage is 6mg / L, and the coagulation reaction is carried out (reaction time is 40min) while carrying out precipitation treatment (time is 2h);

[0039] (3) Filter with a sand filter (filter speed is 10m 3 / m 2h, the working cycle is 12h), and t...

Embodiment 2

[0043] The trial production test was carried out on the roof rainwater generated by a residential area ( figure 1 ).

[0044] (1) The rainwater on the roof is collected through the siphon downpipe, and then enters the rainwater storage tank after the initial waste flow through the rainwater automatic diversion device. The initial waste flow of rainwater is 2mm runoff thickness; the index of rainwater after the initial waste flow is: COD is 100~ 140mg / L, BOD 25~35mg / L, SS 60~80mg / L, chroma about 90 times;

[0045] (2) The rainwater is lifted into the rainwater sedimentation tank through the lifting pump, and the first dosing device is installed on the outlet pipe of the lifting pump, and polyaluminum chloride is added, and the dosage is 5mg / L, and the coagulation reaction is carried out (the reaction time is 30min) while carrying out precipitation treatment (time is 1.5h);

[0046] (3) Filter with a sand filter (filter speed is 8m 3 / m 2 h, the working cycle is 10h), and th...

Embodiment 3

[0050] A trial production test has been carried out on the roof rainwater produced in a community (see attached figure 1 ).

[0051] (1) Roof rainwater is collected through the siphon downpipe, and then enters the rainwater storage tank after the initial waste flow through the rainwater automatic diversion device. The initial waste flow of rainwater is 2mm runoff thickness; the index of rainwater after the initial waste flow is: COD is 80~ 100mg / L, BOD 15-25mg / L, SS 40-60mg / L, chroma about 80 times.

[0052] (2) The rainwater is lifted into the rainwater sedimentation tank through the lifting pump, and the first dosing device is installed on the outlet pipe of the lifting pump, and polyaluminum chloride is added, and the dosage is 5mg / L, and the coagulation reaction is carried out (the reaction time is 40min) while carrying out precipitation treatment (time is 1.5h);

[0053] (3) Filter with a sand filter (filter speed is 6m 3 / m 2 h, the working cycle is 8h), and then the...

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Abstract

The invention discloses a roof rainwater recovery treatment process which comprises the following steps: collecting roof rainwater; carrying out initial split-flow of rainwater; mixing the rainwater remaining after split-flow and polymeric aluminium to carry out coagu-flocculation reaction; filtering after sedimentation treatment; and mixing the filtered rainwater and an antiseptic disinfectant to carry out sterilization and disinfection treatment, wherein the antiseptic disinfectant is organic aluminium chloride ECH-98. The recovery treatment process disclosed by the invention can well be used for impurity and bacterium removal on the roof rainwater and the treated rainwater can be used as non-drinking water for greening irrigation, road washing, vehicle washing and the like. Meanwhile, the recovery treatment process disclosed by the invention can continuously carry out water treatment, discharges good effluent, adopts simple process flow, is low in construction and operation cost, can realize automation, is low in management and maintenance cost and has good application prospect and environmental protection advantages.

Description

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Claims

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Application Information

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Owner SHANGHAI EMPEROR OF CLEANING HI TECH
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