CN103342436A - Method and system for treating municipal waste water with seawater - Google Patents
Method and system for treating municipal waste water with seawater Download PDFInfo
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- CN103342436A CN103342436A CN2013102383051A CN201310238305A CN103342436A CN 103342436 A CN103342436 A CN 103342436A CN 2013102383051 A CN2013102383051 A CN 2013102383051A CN 201310238305 A CN201310238305 A CN 201310238305A CN 103342436 A CN103342436 A CN 103342436A
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Abstract
The invention relates to a method and a system for treating waste water by mixing seawater with municipal waste water. The method comprises the following steps: adding a mixture of seawater and silt into the municipal waste water, carrying out full mixing and reaction and subjecting a colloidal particle in the waste water to destabilization so as to obtain colloidal floc; subjecting the destabilized colloidal floc to still settlement and dehydration and carrying out solid-liquid separation; and allowing effluent obtained after separation to pass through a marsh and a biological wetland and then directly discharging the effluent into a sea. The system is composed of a mixing tank, a scouring tank, a collecting tank and the wetland, wherein the scouring tank, the collecting tank and the wetland are successively connected through pipelines, water in the mixing tank is pumped into the scouring tank through a water pump, the body of the scouring tank is formed by enclosure of piled reeds, crop stalks or sandbags, and the periphery of the scouring tank is provided with water collecting channels which collect effluent and deliver the effluent to the collecting tank. According to the invention, water quality of the effluent can be effectively improved, a great amount of a low-cost filling material can be provided for land reclamation through enclosure of shallows, and newly formed land compensates for cost for waste water treatment.
Description
Technical field
The present invention relates to the municipal wastewater treatment technology, particularly relate to a kind of method and system that utilizes seawater and municipal wastewater combination treatment waste water.
Background technology
China is in the economic rise period fast, national urban wastewater treatment firm year in 2010 amount of disposing of sewage reach 31,800,000,000 tons, " 15 " end of term increases by 114%.In view of this to prevent and treat task also quite heavy for contaminated wastewater.If waste water is not carried out the effective comprehensive regulation, will cause serious environmental to pollute and ecological damage, the harm people are healthy, hinder economic further Sustainable development.The phenomenon of the light mud of heavy water is very general in China's sanitary sewage disposal, and how the mud of the disposal municipal sewage plant of safety economy is the environmental problem that faces jointly both at home and abroad.According to estimates, the annual municipal sludge turnout of China surpasses 4,000,000 t (in dewatered sludge), along with the popularizing of sewage treatment facility, the raising of processing rate and the in-depth of degree for the treatment of, the generation of the byproduct of sewage disposal " mud " is also increasing, and quantity is very surprising.If sludge treatment is improper, very easily cause secondary pollution.At present the most frequently used burning and landfill have relative merits separately, sludge incineration is that main drawback is expensive and issuable pollution (waste gas, noise, vibrations, heat and radiation), the mud sanitary landfill then need take a large amount of soils, expend considerable landfill expense, this makes that the proportion of mud landfill disposal in recent years is more and more littler, and will be subjected to more and more stricter restriction.China's sludge treatment is disposed and is faced with stern challenge.
Summary of the invention
In order to solve the problem that prior art exists, the invention provides a kind for the treatment of process of municipal wastewater, this method is to utilize seawater fully to mix with waste water, not only can make the colloid in the waste water take off surely, save a large amount of water treatment agents fully, enclose the soil that is coated with formation simultaneously and can also solve problems such as the land resources that becomes increasingly conspicuous is in short supply, have great reality and strategic importance to realizing the good and fast development of social economy.
The technical solution adopted in the present invention is: a kind for the treatment of process of municipal wastewater comprises the steps:
(1) add seawater and silt mixture in municipal wastewater, fully after the hybrid reaction, colloidal solid takes off surely in the waste water, obtains the colloid flco;
(2) step (1) is taken off quiet heavy, the dehydration of steady colloidal solid, solid-liquid separation;
(3) with the water outlet after separating in the step (2) by marsh and biological wetland;
(4) sea is directly arranged in the water outlet in the step (3).
The ratio value that adds seawater in the municipal wastewater is advisable between-the 10mV--+10mV to guarantee to mix in the water body of back the ZETA current potential;
The indication seawater is the mixture of seawater and silt in the step (1), and its liquid-solid ratio is advisable with 1:1-10:1.
Seawater in the step (1) fully mixes the back by early stage quiet heavy colloid and sediment deposition thing with waste water, and the colloid in early stage and sediment deposition thing can guarantee the effluent quality qualified discharge as the natural filter bed and adsorption bed of post precipitation;
Seawater in the step (1) fully mixes the filler that the back sediment deposition thing that produces can be made ground as blowing sand with waste water;
Seawater and silt mixture can come from the silt of improved channels and seabed desilting in the step (1);
Take off quiet heavy, the dehydration of steady colloidal solid in the step (2), can suitably add water treatment agent for being conducive to dull thing reinforcing in the solid-liquid separation, as: polyacrylamide, or other any medicament that increases the flco fractal dimension.
Plant plant in the step (3) in marsh and the biological wetland and comprise normal temperature kind, and evergreen kind, cold-resistant kind, cold-resistant kind and salt tolerant alkali crop (towards herding barnyard grass, sweet sorghum, Sunflower Receptacle, paddy barnyard grass, Salicornia Bigelovii Torr., tomato, cold fragrant rose, Chinese tamarisk algae, the red autumnal leaves poplar Radix Astragali, Japanese Honeysuckle, kendir etc.).
The invention also discloses a kind of system that realizes described treatment process, constituted by mixing pit, scouring basin, water collecting basin and wetland; Be connected successively by pipeline between scouring basin, water collecting basin and wetland, the water in the mixing pit pumps into scouring basin by water pump; The pond body of described scouring basin is that reed, farm crop bar or sandbag heap enclose and form, and establishes the irrigation canals and ditches that catchment all around, collects water outlet to water collecting basin.
Fully mix in mixing pit with seawater and silt mixture in the municipal wastewater, colloidal solid tentatively takes off surely in the waste water, and mixed water body is pumped into scouring basin, further takes off in scouring basin surely, obtains the colloid flco; In scouring basin, finish and take off quiet heavy, the dehydration of steady colloidal solid, solid-liquid separation, quiet heavy colloid and sediment deposition thing are deposited at the bottom of the scouring basin, can guarantee the effluent quality qualified discharge as the natural filter bed and adsorption bed of post precipitation; The water outlet that separates in the scouring basin can directly be arranged the sea after by marsh and biological wetland.
Beneficial effect of the present invention is:
1, utilize the brine disposal waste water treatment to save a large amount of water treatment agents;
2, effective means are provided for rationally disposing the mud that produces in the water treatment procedure;
3, the sludge settling thing of this method generation can serve as filter bed and the adsorption bed in the subsequent processes, has improved the water quality of handling water outlet;
4, the mud that produces of this method can be coated with epeirogenetic a large amount of low-cost fillers are provided for enclosing; The new soil that forms has shakeout the cost of sewage disposal.
Description of drawings
Fig. 1 is the inventive method schematic flow sheet.
Embodiment
Embodiment:
Flow process such as Fig. 1 set up and handle mixing pit, scouring basin, water collecting basin and wetland, carry out sewage disposal, and step is as follows:
Mixing pit: municipal wastewater is introduced mixing pit, add the mixture of seawater and silt therein, the value that adds seawater is advisable between-the 10mV--+10mV to guarantee to mix in the water body of back the ZETA current potential; The mixture of seawater and silt, its liquid-solid ratio is advisable with 1:1-10:1; The seawater and the municipal wastewater that are mixed with silt here mix, and mix the back and pump into scouring basin; The design residence time was less than 30 minutes;
Scouring basin: the pond body is that bings such as reed, farm crop bar, sandbag enclose and form, evenly water outlet around guaranteeing; Establish the irrigation canals and ditches that catchment all around, collect water outlet to water collecting basin, with PE pipe coupling scouring basin and water collecting basin.
Water collecting basin: the design residence time, size was decided on the concrete water yield, can adjust less than 12 hours; And with PE pipe coupling water collecting basin and wetland.Wetland: design area 300--500m2, hydraulic load 0.25m3/m2.d.Can be combined by the identical wetland of one or several area, size is looked specifically and voluntarily and is adjusted; Wetland matrix fill (brickbat, haydite, slag, gravel, rough sand), specific form is: utilize local resources, brickbat or gravel.A kind of being chosen as: stromal thickness is 0.8m, divides three layers, upper strata 0.35m(1～2cm); Middle level 0.25m(3～4cm); The 0.2m(5 of lower floor～6cm); Perhaps can be designed as: stromal thickness is 0.7m, upper strata 0.3m(1～2cm); Middle level 0.2m(3～4cm); The 0.2m(5 of lower floor～6cm), the screening detergent power is strong, resistance is similar, and the less plant of increment reduces in the management especially to the many difficulties in the plant materials aftertreatment.Generally should select the plant that exists in the natural wetland in locality or this area for use.Very this vegetation type of pasture and water can be selected reed, Canna generalis Bailey, Caulis Miscanthis floriduli, power flower, Caulis Miscanthis floriduli, yellow flag, parasol grass, hay grass and cattail etc. again, wetland soil can be selected as oriented land-floras of root growth such as Canna generalis Bailey, reed, Rush, the parasol bamboo emperor reed seeds of Job's tears, can also select salt tolerant alkali crop, as towards herding barnyard grass, sweet sorghum, Sunflower Receptacle, paddy barnyard grass, Salicornia Bigelovii Torr., tomato, cold fragrant rose, Chinese tamarisk algae, the red autumnal leaves poplar Radix Astragali, Japanese Honeysuckle, kendir etc.
Among the present invention, parameter such as the table 1 of water inlet and water outlet,
Table 1. water inlet and water outlet parameter
The data of table 1 show water quality allow compliance with emission standards after treatment.
The plant of gathering on the bed mud in the water collecting basin, the wetland returns scouring basin after can be made into compost again, as the settler of subsequent disposal.
Claims (4)
1. method of utilizing the brine disposal municipal wastewater, it is characterized in that: this method comprises the steps:
(1) add seawater and silt mixture in municipal wastewater, fully after the hybrid reaction, colloidal solid takes off surely in the waste water, obtains the colloid flco;
(2) step (1) is taken off quiet heavy, the dehydration of steady colloidal solid, solid-liquid separation;
(3) with the water outlet after separating in the step (2) by marsh and biological wetland;
(4) sea is directly arranged in the water outlet in the step (3).
2. the method for utilizing the brine disposal municipal wastewater according to claim 1 is characterized in that: the amount that adds seawater in the municipal wastewater is to guarantee to mix in the water body of back the ZETA current potential between-the 10mV--+10mV.
3. the treatment process of a kind of municipal wastewater according to claim 1, it is characterized in that: the liquid-solid ratio of seawater and seabed silt is 1:1-10:1 described in the step (1).
4. a system that realizes the described treatment process of claim 1 is characterized in that, is made of mixing pit, scouring basin, water collecting basin and wetland; Be connected successively by pipeline between scouring basin, water collecting basin and wetland, the water in the mixing pit pumps into scouring basin by water pump;
The pond body of described scouring basin is that reed, farm crop bar or sandbag heap enclose and form, and establishes the irrigation canals and ditches that catchment all around, collects water outlet to water collecting basin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310238305.1A CN103342436B (en) | 2013-06-17 | 2013-06-17 | A kind of method and system utilizing brine disposal municipal wastewater |
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| CN201310238305.1A CN103342436B (en) | 2013-06-17 | 2013-06-17 | A kind of method and system utilizing brine disposal municipal wastewater |
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| CN103342436A true CN103342436A (en) | 2013-10-09 |
| CN103342436B CN103342436B (en) | 2015-08-05 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020031120A (en) * | 2002-02-21 | 2002-04-26 | 주식회사 자연사랑바이오텍 | Dirty and waste water purifying system |
| CN201777951U (en) * | 2010-07-20 | 2011-03-30 | 深圳市兴进环保科技有限公司 | Sewage treatment system |
| CN102874784A (en) * | 2011-07-14 | 2013-01-16 | 浙江海洋学院 | Method for recovering nitrogen and phosphor from sewage by precipitation using concentrated seawater generated by sea water desalination |
| CN202766391U (en) * | 2012-09-27 | 2013-03-06 | 北京昊业怡生科技有限公司 | Decentralized sewage treatment device |
| CN203411432U (en) * | 2013-06-17 | 2014-01-29 | 南通大学 | System for treating municipal waste water by using sea water |
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2013
- 2013-06-17 CN CN201310238305.1A patent/CN103342436B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020031120A (en) * | 2002-02-21 | 2002-04-26 | 주식회사 자연사랑바이오텍 | Dirty and waste water purifying system |
| CN201777951U (en) * | 2010-07-20 | 2011-03-30 | 深圳市兴进环保科技有限公司 | Sewage treatment system |
| CN102874784A (en) * | 2011-07-14 | 2013-01-16 | 浙江海洋学院 | Method for recovering nitrogen and phosphor from sewage by precipitation using concentrated seawater generated by sea water desalination |
| CN202766391U (en) * | 2012-09-27 | 2013-03-06 | 北京昊业怡生科技有限公司 | Decentralized sewage treatment device |
| CN203411432U (en) * | 2013-06-17 | 2014-01-29 | 南通大学 | System for treating municipal waste water by using sea water |
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