JPH10272477A - Solid-liquid separation method of cement cleaning water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple solid-liquid separating method of a cement cleaning water without necessitating a storage area of the cement cleaning water, without necessitating labor and time to transport the cleaning water to facilities of a disposal trader, free from the generation of plugging in a drain pipe, without obstructing the function of sewage disposal facilities, capable of preventing environmental from being polluted and capable of treating with a simple vessel such as a bucket or a water tank at a site where the cleaning water is generated. SOLUTION: This solid-liquid separation meted of cement cleaning water adds an emulsion type high molecular flocculate and an inorganic flocclant of a string acid weak alkali salt into turbid alkaline cleaning water generated by cleaning instrument used for cement execution to flocculate and settle a suspended material and simultaneously to neutralize an alkaline material originated from cement and the separate the material into a transparent neutral water and a flocculated precipitate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to turbidity containing a large amount of suspended matter and sediment, which is generated by cleaning equipment used for construction of inorganic cement such as Portland cement and blast furnace cement and polymer-containing cement containing organic matter. The present invention relates to a method of coagulating and sedimenting a solid substance of strongly alkaline washing water and neutralizing an alkaline substance to separate the substance into transparent and neutral water and a coagulated precipitate.

[0002]

2. Description of the Related Art Conventionally, there is no on-site treatment method for cement washing water at the time of cement application. Further, when the amount of washing water is small, turbid water which has not been treated or whose precipitate has just been removed is not always excluded to the sewer.

[0003]

However, the prior art has the following problems. (1) When the treatment is performed by an industrial waste disposal company, it is necessary to secure a place for storing the washing water until a considerable amount is collected and to transport it to the facility of the disposal company.

(2) Even if the washing water is discharged to the sewer without treatment, even if the amount is small, a large amount of sediment contained in the washing water accumulates and causes clogging of the drain pipe. or,
The function of the sewage treatment plant is hindered by the strong alkaline substances derived from cement. (3) In some areas, there is no terminal wastewater treatment facility, and the wastewater discharged to the drainpipe may be directly discharged to public water bodies. In such a case, removing the untreated washing water to the drain pipe may cause clogging of the drain pipe and environmental pollution. (4) When the turbid water from which only the precipitate has been removed is removed to the sewer, the function of the sewage treatment facility is impaired by the strong alkaline substance of the cement. Turbid water causes environmental pollution in areas where there is no waste treatment facility.

[0005] The present invention does not require a storage location for the washing water, does not require the trouble of transporting the washing water to a facility of a treatment company,
It is designed to prevent clogging of drain pipes, prevent the functioning of sewage treatment facilities, and prevent environmental pollution.Use simple containers such as buckets and water tanks to treat in areas where washing water is generated. It is an object of the present invention to provide a simple solid-liquid separation method for cement wash water that can be performed.

[0006]

The object of the present invention is to add a polymer coagulant and an inorganic coagulant of a strong acid and a weak alkali salt to washing water to coagulate and precipitate suspended substances and neutralize alkaline substances derived from cement. And a solid-liquid separation method for cement washing water, which comprises separating into clear neutral water and aggregated sediment. In this case, the polymer flocculant is effectively polyacrylamide, but is not limited to this. In addition, the use of an emulsion type does not require the trouble of dissolving the powder, and the flocculation can be achieved by directly adding a small amount of the liquid flocculant to the washing water, so that there is an advantage that the work becomes easy. Aluminum sulfate, polyaluminum chloride, ferrous sulfate, ferric sulfate, and ferric chloride are effective as inorganic coagulants for strong acids and weak alkali salts.

[0007]

The cement is generally made of Portland cement containing calcium silicate as a main component, and is used as a mortar mixed with sand or as a concrete mixed with sand and gravel. Polymer-loaded cements used for special applications are mixtures of cement, various aggregates, polymers, surfactants and the like. These wash waters consist of sedimentation of sand, gravel, and other aggregates and fine inorganic substances, polymer emulsion particles,
PH containing suspended substances such as surfactants and a small amount of dissolved substances
12 or more strongly alkaline cloudy waters.

When washing water is put into a container such as a bucket or a water tank, and a small amount of an emulsion-type polymer flocculant is dropped and stirred and diffused, and subsequently, a strong acid weak alkali salt inorganic flocculant is sequentially added and stirred. The suspended solids, the suspended solids and the polymer flocculant, and the polymer flocculant are combined, and some of the dissolved substances are combined with these to form the cement,
Although there are some differences in the state depending on the concentration of the washing water, the solid precipitates as particles having a diameter of 1 to 5 mm or as one lump and separates from the transparent innermost water. At the same time, the alkaline substance is neutralized by the strong acid of the inorganic coagulant and falls into the neutral range of PH5 to 9 when it becomes most transparent.

If the particles of the precipitate are small or the unity is weak, a small amount of the emulsion-type polymer flocculant is further dropped and stirred, and the precipitate is aggregated into a strong lump, which facilitates separation from water. The supernatant water is drained to the sewer by tilting the container or by opening a valve attached to the bottom of the tank. At this time, if necessary, filter with a sandbag, cloth bag, nonwoven fabric bag or the like. The sediment is left and drained and treated as industrial waste.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

(Example 1) 10 liters of washing water containing mortar obtained by mixing sand 3 with bolt land cement 1 in a weight ratio of 5 to 100 in a water ratio is put into a bucket, and the concentration is about 50% while stirring with a hesitation. 3 ml of the emulsion type polyacrylamide-based polymer flocculant was added dropwise. Next, 23 ml of a 30% solution of polyaluminum chloride was added and stirred to separate the supernatant into a clear supernatant water of pH 8.80 and an almost one-piece precipitate. The supernatant water could be easily removed by tilting the bucket.

(Example 2) 10 liters of washing water containing 5 parts by weight of commercially available polymer-containing cement with respect to 100 parts by weight of water was put into a bucket, and the mixture was stirred at a concentration of about 5 with a shark.
3 ml of a 0% emulsion-type polyacrylamide polymer flocculant was added dropwise. Next, 53 ml of a 30% solution of polyaluminum chloride was added and stirred. Further, 1 ml of the above-mentioned polymer flocculant was dropped and stirred to separate into slightly turbid supernatant water of PH 8.67 and almost a lump of precipitate. The supernatant water could be easily removed by tilting the bucket.

[0012]

Since the present invention is constructed as described above, it has the following effects.

[0013] Since the washing water can be easily separated into solid and liquid at a place where the washing water is generated in a simple container such as a bucket or a water tank, it is not necessary to treat the washing water to an industrial waste disposal contractor and to treat the washing water. There is no need for a place to store enough water to collect. Also, the labor for transporting to the facility of the industrial waste disposal company is not required.

Since the solid-liquid separation operation is completed in a short time, the solid-liquid separation process can be easily performed even when the amount of washing water is small.
There is no need to remove untreated washing water or turbid alkaline washing water that only removes sediment to sewers or public water bodies, so that drainage pipes impede the functioning of sewage treatment facilities, environmental pollution, etc. Never cause.

Claims (1)

[Claims] 1. An emulsion type polymer coagulant and a strong acid weak alkali salt inorganic coagulant are added to turbid alkaline washing water generated by washing equipment used for cement work to coagulate and precipitate suspended substances. A method for solid-liquid separation of cement wash water, wherein the method further comprises neutralizing an alkaline substance derived from cement and separating the mixture into transparent and neutral water and an aggregated precipitate.