CN1120022A

CN1120022A - Method of disposal coal mine draining sewage with compounding coagulation method

Info

Publication number: CN1120022A
Application number: CN 95104911
Authority: CN
Inventors: 宋乾武
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-05-10
Filing date: 1995-05-10
Publication date: 1996-04-10
Anticipated expiration: 2015-05-10
Also published as: CN1045279C

Abstract

The method for treating sewage drained from coal mine to make it become water supplied to power plant or drinking water features that first the inorganic coagulants, such as lime, aluminium salt, iron salt, or compound Al-Fe salt and then NCF flocculant from natural plant are added in the sewage to remove suspended matter, oil and organic matter, and has the advantages of high effect and low cost.

Description

The method of disposal coal mine draining sewage with compounding coagulation method

The present invention relates to a kind of method that adopts coagulant sedimentation to handle coal mine sewage, relate in particular to a kind of method that adopts inorganic coagulant and NCF natural flocculating agent compounding coagulation disposal coal mine draining sewage.

Except that containing more suspended substance, also contain more machinery oil in the coal mine sewer.Some also contains heavy metal ion, and the most of coal mine sewages of China directly enter surface water body at present, and surrounding environment has been caused tangible pollution.Domestic at present to the most inorganic salt coagulating agent that adopt of the processing of mine sewer, this method can only be removed the suspended substance in the sewer, but in the mine sewer, because down-hole mechanical coal excavation apparatus leakage of oil, and the infiltration of the surface water, make and also contain oils and other organism in this sewage, and the conventional inorganic salt Coagulation Method that adopts can not be removed these pollutents in the mine sewer, the sewage after feasible the processing can not discharge or be unwell to be drunk.

Task of the present invention provides the method for a kind of inorganic coagulant and NCF natural plant flocculant compounding coagulation disposal coal mine draining sewage, this method not only can be removed the suspended substance in the water, can also remove oils in the water and other organism, make the colliery sewer after the processing can reuse or drink.

The object of the present invention is achieved like this, in the sewer of colliery, add inorganic coagulant earlier, make the suspended substance in itself and the sewage generate flocks, then in sewage, add the NCF natural plant flocculant again, make it to adsorb oil and organism in the sewage, thereby from sewage, remove suspended substance and oils and organism.

NCF is a kind of natural plant kind polymeric anion type flocculation agent, it contains multiple organo-functional group, wherein representative functional group is carboxyl, carbonyl, hydroxyl and xanthan acid group etc., inorganic salts coagulating agent (as the composite salt of lime, aluminium salt, molysite or aluminium, iron), its outstanding characteristics are examined surface charge with water-borne glue in being, compression double electric layer reduces zeta-potential, but its adsorption bridging and the effect of sweeping of reins knot volume are very poor.And the outstanding effect of NCF to be reins knot volume sweep effect, and have the charge neutrality effect concurrently, when adopting NCF and inorganic coagulant composite, linear macromolecule among the NCF can pass moisture film, pass through the functional group contained, adsorption bridging between particle that has compressed electric layer and particle, especially the functional group contained of NCF is similar to petroleum-type, strong with the avidity of oil, therefore, adsorption bridging between oil droplet that it can be in being scattered in liquid phase and the oil droplet, make the oil droplet cohesion, thereby produced significantly broken stern oil removing effect, strengthened coagulation effect, reduced the medicine consumption.These two kinds of medicaments are used the synergistic effect of generation, will play independent use one of wherein any the technique effect that can not reach.Therefore, utilize natural plant flocculant NCF and coagulant double crossing to use, in the suspended substance of removing the mine sewer, remove oil content wherein, make water after the processing can be used as to produce and go up water and domestic water.

Fig. 1 is the process flow sheet of first embodiment of the inventive method.

Fig. 2 is the process flow sheet of second embodiment of the inventive method.

Fig. 3 is the process flow sheet of the 3rd embodiment of the inventive method.

Describe the present invention below in conjunction with accompanying drawing.

Embodiment 1

We adopt the NCF compounding coagulation method that Hebei coal mine sewer is handled, and its process flow sheet as shown in Figure 1.After the mine sewer enters equalizing tank 1 regulating pondage water quality, enter a Cyclonic reactor 3 through one-level water pump 2, before sewage enters Cyclonic reactor 3, in sewage, add coagulating agent, and in Cyclonic reactor 3, add NCF solution, and the sewage after the coagulating treatment enters inclined-plate clarifying basin 4, and the clear liquid that is settled out is squeezed into gravity one 6 through secondary water pump 5, enter clean water basin 7 afterwards again, can be used as power plant's feedwater from clean water basin 7 effusive water.

What inorganic coagulant was selected for use in the present embodiment is commercially available polymerize aluminum chloride.At first water dissolution becomes 5% aqueous solution with producing upward with commercially available polymerize aluminum chloride, commercially available NCF is dissolved into 2.5% the aqueous solution, available bases solution (NaOH or milk of lime) is earlier to the NCF lotusization or directly add formation causticization condition in the entry when the waste water slant acidity, dosage according to every liter of waste water 5-40PPM adds coagulating agent in Cyclonic reactor then, react after 1-10 minute, the ratio that connects again according to every liter of waste water 3-20mmg/l adds the NCF aqueous solution, suitably intensity stirred 2-5 minute, in inclined-plate clarifying basin, carry out solid-liquid separation then, the clean water after can obtaining handling.Coal mine sewer after aforesaid method is handled can reach power plant and give water quality standard.Table 1 has provided the water quality before and after handling.

Table 1

After handling pre-treatment

The color brown-black is colourless

Total salinity (mg/l) 480 390

Total hardness (German degree) 9.45 3.2

Total alkalinity (German degree) 11.86 10.5

COD(mg/l) 25 2.0

SS(mg/l) 297 2

Oil (mmg/l) 5-8 0.8

Turbidity (degree) 1.8 embodiment 2

We adopt the NCF compounding coagulation method that Hebei mine sewer is handled, and its technical process as shown in Figure 2.The mine sewer directly enters mechanical stirring quick-speed clarification tank 11, coagulating agent still adopts polymerize aluminum chloride, commercially available polymerize aluminum chloride is dissolved into 5.0% the aqueous solution in elder generation, commercially available NCF flocculation agent is dissolved into 2.5% the aqueous solution, in the ratio of every liter of sewage 5-30mmg/l polymeric aluminum chlorides solution is joined first reaction chamber that mechanical stirring is clarified ground 11 fast according to the water quality of mine sewer, and then with the NCF aqueous solution of 2.5% concentration, join second reaction chamber of mechanical stirring quick-speed clarification tank according to the ratio of every liter of sewage 5-20mg/l, after sewage carries out coagulating sedimentation therein, clear water is squeezed into valveless filter 13 through lift pump 12 again and is filtered, and it promptly is the domestic water that can drink that filtering water flows into clean water basin through sterilizer 14 sterilization backs.Table 2 has provided the water quality before and after handling.

After handling pre-treatment

The color chocolate

SS(mg/l) 300-700 ＜3

Oil (mg/l) 3-8 0.5

COD(mg/l) 30

pH 6.9 6.5-8.5

Colourity (degree)＜15

Turbidity (degree)＜5 embodiment 3

We adopt the NCF compounding coagulation method that coal mine acid sewer in Hebei is handled, and its technical process as shown in Figure 3.

The mine sewer at first enters equalizing tank 21 and regulates the water quality and the water yield, adds AlCl before lift pump 22 is being squeezed into mechanical stirring quick-speed clarification tank 23 ₃Coagulating agent can be with commercially available AlCl ₃Be dissolved into 2.5% solution, add by the ratio of pump intake according to every liter of sewage 5-20mg/l, again commercially available unslaked lime is dropped in the lime slaking machine, make saturated lime slurry, the ratio that adds 0.5-4ml then according to every liter of sewage, milk of lime is added to first reaction chamber of mechanical stirring quick-speed clarification tank, again commercially available NCF flocculation agent is dissolved into 2.5% the aqueous solution, join second reaction chamber of mechanical stirring quick-speed clarification tank according to the ratio of every liter of sewage 5-20mmg/l, after sewage passes through coagulating sedimentation therein, clear water is squeezed into rapid filter 25 through lift pump 24 again and is removed by filter tiny alumen ustum, overflow is gone into clear water also then, and this clear water that advances in the clean water basin can be used as power plant's industrial water supply.Table 3 has provided the water quality before and after handling.

After handling pre-treatment

The color chocolate

SS(mg/l) 200-1100 2

Oil (mg/l) 2-10.5 0.7

COD(mg/l) 50 2.0

pH 4-6

Turbidity (degree) 1.8

The characteristics of the inventive method are:

1, various medicaments is composite, has brought into play the advantage of various medicaments, perfect coagulation process, from And improved the water treatment effect, and reduced reagent consumption, reduced processing cost.

2, accelerate particle sinking speed, shortened hydraulic detention time, reduced the facility volume, Reduced construction investment.

3, NCF has good deoiling effect, has not only removed suspended substance, and has removed oil and the organism in the water.

4, reduced the residual quantity of inorganic salt, the tap water of doing preferably.

Claims

1, a kind of method of disposal coal mine draining sewage with compounding coagulation method is characterized in that adding earlier inorganic coagulant, and then adds the NCF natural plant flocculant.

2, the method for claim 1 is characterized in that above-mentioned inorganic coagulant is the composite salt of lime, aluminium salt, molysite or aluminium, iron.

3, the method for claim 1 is characterized in that the concentration of aqueous solution of the NCF that added is 2.5%, and the pH of adaptation is 4-11.