AU2002243112B2

AU2002243112B2 - Method for utilizing liquied wastes in particular those that are toxic and harmful

Info

Publication number: AU2002243112B2
Application number: AU2002243112A
Authority: AU
Inventors: Wledzimierz Myslowski
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-02
Filing date: 2002-03-14
Publication date: 2007-09-20
Anticipated expiration: 2022-03-14
Also published as: PL199464B1; PL346847A1; WO2002081377A2; WO2002081377A8; HK1068864A1; CN1527800A; WO2002081377A3; CN1248977C; EP1373148A2

Description

WO 02/081377 PCT/PL02/00023 METHOD FOR UTILIZING LIQUID WASTES IN PARTICULAR THOSE THAT ARE TOXIC AND HARMFUL The present invention provides a method for utilizing liquid wastes, especially those that are toxic and harmful and in particular those in the form of sludge, sewage, paste and liquids.

I So far toxic and harmful wastes, especially in the form of sludge, sewage and paste containing remains of paint, lacquer or solvents have been utilized through their incineration in waste incinerators, utilization through chemical methods, storage in packaging or burial grounds at waste dumping grounds.

At present practically no use is made of toxic and harmful waste recycling methods based on the idea of solidification or industrial use.

The disadvantage of toxic and harmful waste utilization through their incineration is that large quantities of combustion products and heat energy are emitted into the atmosphere causing environmental pollution. The disadvantage of waste utilization using the chemical method is its high cost resulting from the need to make costly preliminary studies as wastes have various chemical compositions and the disadvantage of container storage relates to the risk of container damage during transit or as a result of the process of natural degradation of container materials. In this way the problem of utilization of wastes stored at dumping grounds is left for future generations to solve.

WO 02/081377 PCT/PL02/00023 -2- In order to utilize liquid wastes the method provided by the invention uses sulphur polymer, which so far has been used as a binder for solidifying mixes for road repairs and for proofing construction materials in the form of concrete and reinforced concrete elements, concrete road surfaces, concrete pavement blocks, natural stone, wood and other similar materials and industrial solid wastes undergoing utilization.

From the Polish description of patent application no P-339314 a method is known for making mixes based on a sulphur binder for use in road repair work where sulphur polymer is used characteristic in that sulphur and/or sulphur polymer is heated up until they reach their liquid or semi-liquid state, after which they are sprayed, preferably using positive pressure while in the area of such mist mineral aggregate and metal filler are introduced and where the metal filler is preferably in the form of short metal filaments until the mineral aggregate and metal filler are completely coated with sulphur and/or sulphur polymer, after which they are cooled down to the ambient temperature level.

Sulphur polymer has also been used for proofing construction materials in the form of concrete and reinforced concrete elements, concrete road surfaces, concrete pavement blocks, natural stone, wood and other similar materials and solid industrial wastes subjected to utilization processes. The method is described in the Polish description of patent application no P 341996 and is characteristic in that size-reduced industrial waste, for example, in the form of fluorescent lamp breakage waste constituting up to 70% by weight is mixed with sulphur polymer and the resulting mixture is heated up to 140 When the set temperature is reached the mixture is poured into metal capsules or profiling moulds. After that they are left to naturally cool down to the ambient temperature level.

The purpose of the invention is to provide a method for utilizing liquid wastes, especially those that are toxic and harmful using sulphur polymer and mobile utilization equipment that can be used at waste generation locations.

0 The method for utilizing liquid waste, in particular, those that are toxic and N harmful is characteristic in that a tank made of a material that does not adhere to sulphur polymer, preferably a mobile mixer, in which there is negative pressure is filled up to from 30% to 100% of its capacity with liquid wastes, after which the tank is made to move with rotary motion or rotary-planetary motion and where at the same time the waste is preferably subjected to the action of superheated steam at a temperature between 140 0 C and 300 0 C until the waste is transformed into granulated material, after which sulphur polymer in the form of liquid or (Ni broken-up material is injected into the drum being in continuous motion where 0 10 the rotary or rotary-planetary motion of the drum and the injection of sulphur 0 (Ni polymer are stopped when the granulated waste is completely coated, after which the tank is emptied.

In particular, in accordance with the invention there is provided a method for utilizing liquid wastes, in particular those that are toxic and harmful, characterised in that a tank is provided, said tank being made of a material to which sulphur polymer does not adhere, said tank having a negative pressure and filled up to from 30% to 100% of its capacity with said liquid wastes, after which the tank is made to move with rotary motion or rotary-planetary motion, until the waste is transformed into granulated material, after which sulphur polymer in the form of liquid or broken-up material is injected into the tank while maintaining continuous motion, where the rotary or rotary-planetary motion of the tank and the injection of sulphur polymer are stopped when the surface of the granulated waste is completely coated, after which the tank is emptied.

Preferably the tank is a mobile mixer.

Preferably the step of making the tank move with rotary motion or rotaryplanetary motion, the waste is subjected to the action of superheated steam at a temperature between 140 0 C and 3000C until the waste is transformed into said granulated material.

Preferably the waste is subjected to the action of superheated steam at a temperature of about 150 0

C.

Preferably the preceding claims wherein the tank is initially filled to about 50 of its capacity with said liquid wastes.

An advantage of the method for utilizing liquid wastes in particular those that are toxic and harmful provided by the present invention is that it ensures correct and real waste utilization at their generation sites without the need for their transport and movement, which results in a shorted utilization cycle.

Example: A tank in which there is negative pressure is filled up to 50% of its capacity with liquid chemical wastes in the form of paint sludge. The tank is made to move with rotary motion and the sludge inside is treated with superheated steam at 150 0 C until the sludge is turned into granulated material, after which sulphur polymer is injected into the tank being in continuous motion.

The motion of the tank and the injection of sulphur polymer is stopped after the granulated waste is completely coated with sulphur polymer. The granulated waste with sulphur polymer coating is poured into drums or moulded into construction elements.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.

The preceding discussion of the background to the invention is intended only to facilitate an understanding of the present invention. However, it should be appreciated that the discussion is not an acknowledgement or an admission that any of the material referred to was or is part of the common general knowledge in Australia as at the priority date of the application.

Claims

1. A method for utilizing liquid wastes comprising: i) filling a tank with liquid waste; ii) subjecting the tank to motion; iii) simultaneously exposing the liquid waste to steam to form a granulated material; and iv) adding a binder to coat the granular material.

2. A method according to claim 1, wherein the interior of the tank is under negative pressure prior to adding the liquid waste.

3. A method according to claim 1 or 2, wherein the tank is filled to between about to 100% capacity with the liquid waste.

4. A method according to any one of claims 1 to 3, wherein the motion of the tank comprises rotary or rotary-planetary motion.

A method according to any one of the preceding claims, wherein the steam is superheated.

6. A method according to any one of the preceding claims, wherein the temperature of the steam is between about 140 0 C to 300 0 C.

7. A method according to any one of the preceding claims, wherein the binder comprises a sulphur polymer.

8. A method according to any one of the preceding claims, wherein the binder is in the form of a liquid.

9. A method according to any one of claims 1 to 7, wherein the binder is in the form or broken-up material.

A method according to any one of the preceding claims, wherein the tank remains in motion subsequent to the addition of the binder.

11. A method according to any one of the preceding claims, wherein the motion of the tank is ceased upon substantially complete coating of the granular material with the sulphur polymer.

12. A method according to any one of the preceding claims, wherein the tank is formed from a material which does not adhere to the binder.

13. A method according to any one of the preceding claims, wherein the tank comprises a mobile mixer.

14. A method according to any one of the preceding claims, wherein the granular material coated with the binder is moulded into construction elements.

A method according to any one of claims 1 to 13, where in the granular material coated with the binder is poured into drums.

16. A method for utilizing a waste material substantially as hereinbefore described with reference to Example 1.