CN103058419A

CN103058419A - Defluorination process for drinking water

Info

Publication number: CN103058419A
Application number: CN2013100224879A
Authority: CN
Inventors: 刘泽山
Original assignee: JIANGSU WATER AND WASTEWATER EQUIPMENT Co Ltd YONG-PIPE
Current assignee: JIANGSU WATER AND WASTEWATER EQUIPMENT Co Ltd YONG-PIPE
Priority date: 2013-01-18
Filing date: 2013-01-18
Publication date: 2013-04-24
Anticipated expiration: 2033-01-18
Also published as: CN103058419B

Abstract

The invention discloses a defluorination process for drinking water, belonging to the technical field of water treatment. The process comprises the following steps of: (1) pouring 50-150 ppm of poly-aluminium chloride in raw water; (2) pouring 10-50 ppm of kieselguhr or kaolin or attapulgite in the water, and adequately mixing; (3) filtering by using a granular hydroxyapatite filter material; and (4) filtering by adopting sand filter or a fibre ball filter, so as to obtain the drinking water. With the adoption of the defluorination process for the drinking water disclosed by the invention, an ideal defluorination effect can be stably obtained for a long time, the hydroxyapatite defluorination filter material does not need to be regenerated during a running process, a complex process for updating the whole filter material is avoided, the poly-aluminium chloride after defluorination, the fallen hydroxyapatite defluorination filter material dust, the poured kieselguhr and the like are separated from the water via flocculation reaction, so that the problem of the standard exceeding of aluminium ions in the water after the treatment is avoided.

Description

A kind of drinking water defluorination technique

Technical field

The present invention relates to a kind of water technology, specifically a kind of drinking water defluorination technique.

Background technology

Drink the fluorosis that water of high fluorine content causes and relate to worldwide endemy, the lighter causes dental fluorosis, and severe one can cause skeletal fluorosis, causes osteoporosis, ostealleosis, even paralysis, disability.China is one of country that fluorosis is the most serious in the world, and except Shanghai City, the each province that spreads all over the country mainly is distributed in rural area and pastoral area that economy falls behind relatively, and the sick village population of poisoning because of the water of high fluorine content source is at present drunk removing fluor in water and seemed especially important up to 80,000,000.

At present, domestic and international general technology of Fluoride Removal mainly adopts absorption method and coagulant sedimentation, but these two kinds of methods have certain limitation.Can the regeneration problem of sorbent material be to affect sorbing material be used for one of key factor of defluoridation filter material in the absorption method, because the work-ing life of defluoridation filter material is all shorter, when defluoridation filter material can not be regenerated, need the integral replacing filtrate, Renewal process bothers very much, and this is to cause the major reason that a lot of fluoride-removing equipments can not life-time service.To exceed standard be a very serious problem to aluminum ion in the coagulant sedimentation, and adopt separately the coagulant sedimentation often can not be so that the fluorine of water outlet is up to standard.

Summary of the invention

Problem for above-mentioned prior art exists the invention provides a kind of drinking water defluorination technique, can not need to change, process the problem that does not have aluminum ion to exceed standard in the rear water by defluorination and defluoridation filter material steady in a long-term.

To achieve these goals, the step of a kind of drinking water defluorination technique of the present invention is:

(1) adds the polymerize aluminum chloride of 50ppm～150ppm among the Xiang Yuanshui;

(2) Xiang Shuizhong adds diatomite or kaolin or the attapulgite of 10ppm～50ppm, fully mixes after the interpolation;

(3) use granular hydroxyapatite filtrate to filter, the initial dosage that granular hydroxyapatite filtrate is per hour processed 1 ton of water is 10kg～200kg, the loss of hydroxyapatite filtrate surpass initial dosage 5% the time, add granular hydroxyapatite filtrate;

(4) adopt sand filtration or fiber ball filter to filter, obtain tap water.

Compared with prior art, the present invention carries out respectively defluorination by polymerize aluminum chloride and hydroxyapatite filtrate, and the interaction of polymerize aluminum chloride and hydroxyapatite filtrate, polymerize aluminum chloride is hydrolyzed rear so that the hydroxyapatite particulate filter Surface disintegration of surface adsorption fluorine comes off, so that the unsalted surface of hydroxyapatite filtrate exposes, recover hydroxyapatite filtrate defluorination ability, the diatomite of the aluminum ion in the entry of polymerize aluminum chloride band and the powdery hydroxyapatite filtrate that comes off from the surface and interpolation or kaolin or attapulgite, carry out flocculation reaction and precipitate, after follow-up filtration, dammed, solved the problem of the aluminium that is dissolved in the water, so that the residual quantity of aluminium is lower than standard-required in the final outflow water; Thereby reach following effect: obtain steadily in the long term desirable defluorination effect; The hydroxyapatite defluoridation filter material need not regenerated in operational process, does not have the complex process of filtrate whole updating; The powdery hydroxyapatite defluoridation filter material that behind the polymerize aluminum chloride defluorination and surface comes off and the diatomite that adds etc. are deviate from from water by flocculation reaction, so that no longer include the problem that aluminum ion exceeds standard in the water after processing.

Description of drawings

Fig. 1 is the embodiment of the invention one process flow sheet;

Fig. 2 is the embodiment of the invention two process flow sheets;

Fig. 3 is the embodiment of the invention three process flow sheets.

Embodiment

Below the invention will be further described.

A kind of drinking water defluorination technique, the concrete steps of this technique are:

(1) adds the polymerize aluminum chloride of 50ppm～150ppm in 1 ton of former water, except the part fluorine in anhydrating;

(2) Xiang Shuizhong continues to add diatomite or kaolin or the attapulgite of 10ppm～50ppm, fully mix after the interpolation, diatomite or kaolin or attapulgite and polymerize aluminum chloride carry out flocculation reaction, can further reduce the residual quantity of aluminium in the water and reduce the content of fluorine, wherein the chemical composition of diatomite, kaolin, attapulgite is basically identical;

(3) use granular hydroxyapatite filtrate to filter the fluorine of removing in the part water; Polymeric aluminium reaction after granular hydroxyapatite filtrate and the hydrolysis, so that granular hydroxyapatite filter material surface comes off unsalted surface is come out, to recover Fluoride-Absorption Capacity, the powdery hydroxyapatite filtrate and the polymerize aluminum chloride that come off from the surface carry out flocculation reaction, reduce the residual quantity of aluminium in the water and reduce the content of fluorine; The loss of hydroxyapatite filtrate surpass initial dosage 5% the time, add granular hydroxyapatite filtrate;

(4) adopt sand filtration or fiber ball filter to filter, hold back flco, obtain tap water, guarantee that delivery turbidity meets the state health standards requirement.

Embodiments of the invention one are: former water fluorine content is 1.8mg/L, adopts art breading as described in Figure 1:

(1) in inlet channel, adds the polymerize aluminum chloride of 30ppm;

(2) in inlet channel, add the diatomite of 10ppm;

(3) fully mix through line mixer;

(4) filter through the filtration unit that the granular hydroxyapatite filtrate of 100kg is housed;

(5) filter through sand filtration, obtain the water outlet that conformance with standard requires;

(6) regularly the mixing wastewater with air back flushing is carried out in sand filtration.

By above-mentioned processing, the water outlet fluorine content is 0.5mg/L, and Aluminium residual is 0.05mg/L, meets the requirement of corresponding index in the state health standards.

Embodiments of the invention two are: former water fluorine content is 2.6mg/L, adopts art breading as described in Figure 2:

(1) in inlet channel, adds the polymerize aluminum chloride of 90ppm;

(2) in inlet channel, add the kaolin of 15ppm;

(3) fully mix through line mixer;

(4) filter through the filtration unit that the granular hydroxyapatite filtrate of 120kg is housed;

By above-mentioned processing, the water outlet fluorine content is 0.8mg/L, and Aluminium residual is 0.08mg/L, meets the requirement of corresponding index in the state health standards.

Embodiments of the invention three are: former water fluorine content is 3.6mg/L, adopts art breading as described in Figure 3:

(1) in inlet channel, adds the polymerize aluminum chloride of 150ppm;

(2) in inlet channel, add the attapulgite of 50ppm;

(3) fully mix through line mixer;

By above-mentioned processing, the water outlet fluorine content is 0.8mg/L, and Aluminium residual is 0.12mg/L, meets the requirement of corresponding index in the state health standards.

Claims

1. a drinking water defluorination technique is characterized in that, the concrete steps of this technique are:

(2) Xiang Shuizhong adds diatomite or kaolin or the attapulgite of 10ppm～50ppm, fully mixes;

(4) adopt sand filtration or fiber ball filter to filter, obtain tap water.