CS267771B1 - A method of purifying waste water from asbestoseactive production - Google Patents

Abstract

The solution concerns the process of wastewater sludge water discharge from the asbestos cement industry and solves the neutralization of sludge water pH to pH 6 to 8 and the reduction of chromium Cr° to Cr. The essence is that the reduction of chromium and pH neutralization are performed simultaneously in the main volume of discharged wastewater sludge water, with the addition of green slag and carbon dioxide in the stirred sludge water, washed in a sludge water tank without dosing into the wastewater treatment plant equipment.

Description

EN 267 771 Θ1 1

The present invention relates to a method for sludge drainage from and to the production of a product comprising Cr Cr compounds and 12 pH alkalinity.

The production of asbestos-cement products occurs in the course of production and, in particular, the release of waste sewage containing ceaent, azbeat and partite.

Sludge water and and concentrates in the tank where aa mills the sludge pumps to prevent sludge sedimentation and, at the same time, pumped into the wastewater treatment facility. By dosing akallka green in the amount of 2.8 - 3 kg / · 3, the reduction of Cr3 + chromium and the post-carbonation of the carbon monoxide in the reactor in the amount of 7.5 - 8 kg / 3 and 3 liters at a low concentration of sludge water neutralization from 12 pH to 8 pH , followed by pumping to the gravel container, where the sludge takes place and which is compressed by the steam and the separated water is used for technological purposes or waste water leaves. The low ilelation effect, the high alkali leached wastewater does not meet today's demand for cleanliness of the drained water and protection of the glandular environment.

The aforementioned asbestoseacent wastewater is also disadvantageous.

The power of the booster station is limited by the volume of the screed traps that are clogged with the sludge and difficult to clean, maintain and service. The additional water used in the clarifier causes excess water, and the sludge water in the reservoir is precipitated, thereby causing its chemical composition to deteriorate.

Accordingly, the disadvantage of this invention is eliminated by the proposed waste water drainage system of the invention, characterized by the fact that 2 liters are dispensed into the entire amount of hot water discharged from the non-cement production, concentrated in the sludge tank. 8-3 kg / m3 of vitrified green, and carbon dioxide of 7.5-8 kg / 3 is fed to the discharge side of the boiler pumps. Also, the sludge water in the reservoir can also be known by the known rotary pressurizer and the current feed of carbon monoxide to the bottom of the tank. By swirling the sludge water in the reservoir, we achieve a preale-lance and a carbon dioxide and a cola of green carbon with a subsequent neutralization of pH 6 to 8 and a Cr6 + reduction to Cr3 + without treatment to form a waste water stopper.

The effluent sludge with the excrement used used to set up the feed station as a neutral reactor, and additional auxiliaries would increase labor productivity, reduce maintenance costs, reduce electricity consumption, and reduce the cost of building a sewage waste station. Example 1

It reduced the c? + Compound to Cr3 + and neutralized pH 12 to pH 8 with a slurry water tank of 250? Where the asbestos-cement sludge water was sprayed and milled with sludge pumps.

The reduction of the Cr 3 + a chromium compound to Cr 3+ aa converts in the sludge water tank, where aa per 1 m 3 dosed 2.8 - 3 kg of green vitriol, which is reduced to Cr 3+ and Cr 3+ by sludge water. The water thus treated contains 0.1 mg / l of Cr3 + chromium + 2 ng / l of Cr3 + chromium. Simultaneously with the reduction of chromium, neutralization of 12 pH takes place at 8 pH of the addition of gaseous carbon dioxide at a rate of 7.5-8 kg / 3 to the discharge side of the sludge pumps.

Claims (1)

2 CS 267 771 B1 Example 2 Sewage sludge water is continuously conveyed to the tank, where a green rock solution is dosed into the tank by a mechanical rotain with a quantity of 2.8 - 3 kg / a3 and an oxide is dispensed to the bottom of the tank. carbon dioxide of 7.5 - 8 kg / m 2 of treated water, which is slurried with sludge water and thereby reduced its alkali to 8 pH, the reduced and neutralized sludge water being conveyed to the 5-bed sedimentation tank where sedimentation occurs katu. The separated water is fed to Salia's sedimentation tank, where the insoluble melts are ice-cooled. The purified water is discharged into the canister or consumed in production. And the sedimentation sediment from the itrbline drainage tank is exported mechanically to the designated landfill as waste with a maximum content of 2 mg / l Cr3 + and 0.1 rag / l Cr ^ +. This method of sewage sludge purification from asbestos-cement production can be used in larger asbestos-cement bedding because the designed sewage sludge treatment utilizes the current technological equipment, mainly the built-up sludge tanks, where the waste disposal is carried out with a cement-based production, without the need for a 1-year construction of a sewage drainage station. SUBJECT MATERIAL Waste water treatment from asbestos cement production contains Cr * + chromium compounds with alcatlt 12 pH in the sludge tank and milled with sludge pumps, or by mechanical agitation of green and carbon dioxide. 2.8 to 3.5 kg / m 2 of green rock is metered into the spent sludge water and carbon dioxide is introduced into the shredded sludge water in an amount of 7.5 to 9.5 kg / m · 5.