WO2013155575A1

WO2013155575A1 - Compact system for treating effluents in real time

Info

Publication number: WO2013155575A1
Application number: PCT/BR2012/000125
Authority: WO
Inventors: André Luiz Carrara DA CUNHA
Original assignee: Ecotech Da Amazõnia - Comércio De Filtros Ltda
Priority date: 2012-04-19
Filing date: 2012-04-19
Publication date: 2013-10-24

Abstract

A description is given of a compact system for treating industrial, domestic or mixed effluents that allows the treating of effluents with practically zero effluent-standing time and without production of odours or residual sludge, comprising a group of units associated in a closed circuit that fully complies with all the effluent-treatment steps stipulated by environmental legislation, from pre-treatment to tertiary treatment, in such a manner that the fluid released is suitable for re-use, including a physical aggressive-processing module provided with a collection unit (10) interlinked with the collecting mains (100) and a homogenization unit (30); a physical/chemical aggressive-processing module provided with an oxidation unit, with an ozone generator (40); and a chemical aggressive-processing module that receives the effluent from the oxidation unit (40) and conveys it to the chlorination unit (50), to the fine filtration unit (70) and to the sterilization unit (80) where ultraviolet radiation is applied, and thence to a release pipeline (90) for delivery to a receiving vessel.

Description

COMPACT WASTE TREATMENT SYSTEM IN

REAL TIME

FIELD OF INVENTION

The present invention describes a compact real-time wastewater treatment system. More specifically, it comprises a system that enables the treatment of industrial, domestic or mixed effluents with practically zero effluent residence time and without the production of odors or residual sludge.

BACKGROUND OF THE INVENTION

Sewage, effluent, or wastewater is all liquid waste from industry and households that needs proper treatment to remove impurities and thus be returned to nature without causing environmental damage and human health.

Generally nature itself has the ability to decompose the organic matter present in rivers, lakes and the sea. However, in the case of effluents, this large amount of material requires a more effective treatment in a Sewage Treatment Plant (ETS) that basically reproduces the action of nature faster (SPERLING, MV). Water and Sewage Treatment (2nd ed., Rev. Belo Horizonte: UFMG, 1996).

Effluent treatment systems are based on the transformation of dissolved and suspended pollutants into inert gases or sedimentable solids for further separation of the solid / liquid phases.

The prior art describes various wastewater treatment systems that basically follow a set of steps that include pretreatment, primary treatment, secondary treatment and tertiary treatment.

The pre-treatment stage consists solely of physical processes, and removal of suspended materials and coarse solids is foreseen.

Afterwards, the primary treatment step is foreseen which includes physicochemical processes for the equalization and neutralization of the effluent charge, with the separation of liquid or solid particles through flocculation and sedimentation processes.

In the next stage of secondary treatment, organic matter and nutrients such as nitrogen and phosphorus are removed by biochemical reactions by aerobic or anaerobic processes.

Finally, the tertiary treatment or "polishing" step may be employed for the purpose of removing specific pollutants (usually toxic or non-biodegradable compounds) in wastewater prior to discharge into the receiving body and / or for closed system recirculation. or for the further removal of pollutants not sufficiently removed in the secondary treatment.

By definition, tertiary treatment methods correspond to advanced effluent treatment using techniques with such high power to remove sewage forming agents that even make water reuse possible. Tertiary treatment foresees treatment methods for sewage disinfection, that is, it removes pathogenic organisms from the sewage and treatment methods for the removal of nutrients, which aims to avoid imbalance in the disposal of elements. in the recipient body, preventing eutrophication, a phenomenon of overgrowth of aquatic plants and organisms such as algae, which have the potential to release large amounts of toxins, causing fish to die, affecting biodiversity, releasing toxic odor-causing gases. unpleasant and decreasing water transparency.

However, the tertiary stage of wastewater treatment, responsible for the elimination of chemical nutrients such as phosphorus, is not yet common in Brazil. As a result, only 40% of the sewage phosphorus is eliminated in the first two steps, and the remainder remains in the treated sewage and is released into the recipient body. Phosphorus from human feces has a high power of contamination.

Thus, although variants of these conventional domestic and industrial wastewater treatment systems are described, the common feature is the need for an extensive area for wastewater treatment plant installation, the production of odors, gases and sludge and the time effluent residence in the system prior to release into the receiving body.

Therefore, the object of the present invention is a compact real-time effluent treatment system which enables the treatment of industrial, domestic or mixed effluents with virtually zero effluent residence time and without the production of odors, gases or residual sludge. demanding an area for installation of the treatment plant about ten times smaller than the conventional ones, fully complying with all the phases of the effluent treatment prescribed by the environmental legislation.

SU ARIO

A compact treatment system is characteristic of the invention. real-time effluent treatment that enables the treatment of industrial, domestic or mixed effluents with effluent residence time in the system practically null and without the production of treatment and post-treatment odors, gases and residual sludge.

It is a feature of the invention a compact real-time effluent treatment system which does not require the conventional anaerobic reactors, optional, anaerobic or maturing ponds characteristic of conventional treatment systems.

The invention features a compact real-time effluent treatment system that promotes the treatment and disinfection of sanitary or industrial effluent, giving it Class II water characteristics, according to CONAMA Resolution 357 of December 2006.

It is a feature of the invention a compact real-time effluent treatment system which allows the reuse of treated fluid in diverse environments, for both food washing and general cleaning, water supplies and / or replacement of water losses by evaporation, seepage / percolation, in swimming pools, lagoons and others, intended for aquaculture projects in general.

It is a feature of the invention to have a compact real-time wastewater treatment system that requires a treatment plant installation area about ten times smaller than conventional installations.

The invention features a compact real-time wastewater treatment system that fully complies with all stages of wastewater treatment prescribed by environmental legislation by disinfecting treated wastewater for the removal of pathogenic organisms or, in special cases, removal of certain nutrients, such as nitrogen and phosphorus, which may enhance, either alone or in combination, the eutrophication of recipient waters.

It is characteristic of the invention a compact real-time wastewater treatment system which has low deployment and operating costs, around 40% of conventional systems.

It is a feature of the invention that a compact real-time wastewater treatment system with reduced energy consumption.

It is a feature of the invention that a compact real-time wastewater treatment system does not require an additional disinfection system.

It is a feature of the invention that a compact real-time effluent treatment system can be adapted for the abstraction and treatment of water for human consumption.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 shows the schematic representation of the compact effluent treatment system.

Figure 2 presents the representation of peripheral equipment.

Figure 3 shows the flowchart of the wastewater treatment process steps using the compact wastewater treatment system.

DETAILED DESCRIPTION OF THE INVENTION

The compact real-time wastewater treatment system, which is the object of the present invention, comprises a set of associated units in a closed loop that fully comply with all stages of wastewater treatment prescribed by environmental legislation, from pre-treatment to tertiary treatment. so that the released fluid is fit for reuse.

The compact real-time wastewater treatment system comprises a physical attack module that includes a collection unit (10) interconnected to the collection network (100), said collection unit (10) which has a raw effluent inlet valve to arranging a coarse particle retention means (not shown) that prevents ingress of material that may cause damage to the equipment.

From the collection unit (10), the raw effluent is pumped through a first motor unit (20) through ducts to a homogenization unit (30) where the floating material present in the liquid effluent is withdrawn to avoid damage to the The efficiency of the following physicochemical, chemical and biological processes, in view of the effluent treatment system, object of the present invention, does not require the presence of anaerobic and aerobic tanks.

The effluent released from the homogenization unit (30) goes to a physicochemical attack module by acting a second motor unit (21), said effluent that goes through an oxidative process where an ozone generator (40) performs the ozonation of the effluent to break down the carbon chains of proteins such as cadaverine and putrecin, avoiding the odor of rot; polymers, such as polyphosphates derived from the use of detergents, preventing post-treatment phosphorus pollution; oxidation of organic carbon to carbon dioxide and water, thereby destroying the energy source; oxidation of organic and ammoniacal nitrogen to nitrate, avoiding foul and unpleasant odors; oxidation of sulfur to eulfate, preventing gas formation suifidric and its unpleasant odor; oxidation of the heavy metals present, reducing their toxicity; oxidation of phosphine to phosphate and phosphorous oxide (insoluble), avoiding its high toxicity and unpleasant odor and recovery of dissolved oxygen concentration in the liquid medium, preventing its return to the non-oxidized phase.

In the chemical attack module, the oxidized effluent is sent to the chlorination unit (50) where it is subjected to the action of sodium hypochlorite (NaOCI) with ingress controlled by a first metering pump (60), said sodium hypochlorite that ensures greater stability. and promotes the elimination of saprophytic bacteria, thermotolerant, total and fecal coliform and other microorganisms by chance present, to ensure a concentration of 10mg Cl ₂ / L to the thin! of the sterilization phase.

From the chlorination unit (50), the effluent flows to the fine filtration unit (70) where filter media (not shown) having a particle holding capacity of up to 0.002 microns is arranged. This filtering condition is necessary in order to provide a high degree of transparency that does not impair the efficiency of ultraviolet sterilization.

The effluent is released from the fine filtration unit (70) and proceeds to the sterilization unit (80) where ultraviolet radiation is applied to provide for the elimination of oxidation resistant microorganisms, including viruses that are normally present in sanitary effluents.

The treated effluent (type II water) proceeds to a release duct (90) to flow into a receiving body.

Preferably, the filter media have as their material filtering the pebble, sand, zeolite and charcoal.

The system features a first metering pump (60) for controlling sodium hypochlorite ingress through a specific duct in the first motor unit (20), and a second metering pump (61) for controlling aluminum sulfate ingress (AI _2). S0 ₄ ) through a specific duct in the second drive unit (21).

The ozone generator (40) is powered by an oxygen concentrator (41).

Claims

CLAIMS:

1. COMPACT REAL-TIME WASTE TREATMENT SYSTEM characterized by:

a) a physical attack module including a collection unit (10) interconnected to the collection network (100), said collection unit (10) which has a coarse particulate retention means in the raw effluent inlet valve (not shown), with the raw effluent being pumped from a first drive unit (20) to the homogenization unit (30) where the floating material present in the liquid effluent is withdrawn;

b) a physicochemical attack module that receives the effluent from the homogenization unit (30) and actuated by a second motor unit (21) forwards the effluent to an oxidation unit with an ozone generator (40);

c) a chemical attack module that receives the effluent from the oxidation unit (40) and forwards it to the chlorination unit (50) where it is subjected to the action of sodium hypochlorite (NaOCI) with ingress controlled by a first metering pump (60). ) following the fine filtration unit (70) where filtering means (not shown) are disposed and then to the sterilization unit (80) where ultraviolet radiation is applied and then to a release duct (90) for flow to a receiving body.

COMPACT REAL-TIME EFFLUENT TREATMENT SYSTEM according to Claim 1, characterized in that the fine filtration unit (70) has filter media having a particulate holding capacity of up to 0.002. micra.

COMPACT REAL-TIME EFFLUENT TREATMENT SYSTEM according to Claim 1, characterized in that the filter media preferably have pebble, sand, zeolite and charcoal as a filter material.

COMPACT REAL-TIME EFFLUENT TREATMENT SYSTEM according to claim 1, characterized in that it has a second metering pump (61) for controlling aluminum sulfate ingress (AI ₂ S0 ₄ ) through a specific duct. on the second drive unit (21).