Copper Mines in the Desert, Food on the Table: Two Hidden Tracks of Industrial Wastewater Treatment in Latin America

Introduction: The Overlooked “Industrial Water Crisis”

When it comes to water resource issues in Latin America, most reports focus on urban water supply shortages or rural sanitation deficiencies. But if we shift the lens to the region’s economic structure itself, we find that the two true pillars driving Latin America’s export earnings — mining and food processing — are facing industrial wastewater challenges that are distinctly different yet equally urgent.

Regional-level data sufficiently illustrate the scale of infrastructure deficits. According to estimates by CAF (Development Bank of Latin America), between 2010 and 2030, the region will require approximately USD 80 billion in investment for sewerage networks and another USD 33 billion for wastewater treatment facilities.

Even so, only about 50% of the population is currently connected to sewage systems, and of the collected wastewater, only about 30% is actually treated.

The implication behind these figures is that municipal wastewater systems are already stretched thin, leaving industrial wastewater treatment responsibilities largely to the enterprises themselves — this is both a pressure and a business opportunity for the water treatment industry.

Industry research institutions project that the Latin American water and wastewater treatment market will grow from its current level to approximately USD 48.12 billion by 2032; from a global perspective, the industrial wastewater treatment market is also expected to grow from about USD 20.01 billion in 2026 to roughly USD 32.22 billion by 2034, at a compound annual growth rate of about 5.5%.

Against this backdrop, Chilean copper mining and Brazilian food processing represent two distinctly different logics of industrial wastewater treatment: the former is “how to make the most of every drop of water in an extremely water-scarce region,” while the latter is “how to turn high-strength organic wastewater from an environmental burden into a resource.”

Track 1: The “Seawater Closed-Loop” Revolution in Chilean Copper Mining

Mining copper in the desert is an inherent mismatch of water resources

Chile possesses the world’s largest copper resources, with copper exports contributing over half of the country’s export value.

However, the vast majority of major mining districts — Escondida, Collahuasi, Los Pelambres, Quebrada Blanca — are located in and around the Atacama Desert, one of the driest regions on Earth. Mining itself accounts for less than 4% of Chile’s total national water consumption (agriculture accounts for as much as 72%), but because the mines are highly concentrated in the water-scarce north, water resource conflicts have never truly subsided over the past decade or more. The drought in 2022 once caused combined production cuts of more than 100,000 tonnes of copper at the Los Pelambres and Los Bronces mines.

A deeper challenge lies in the continued decline in ore grades: lower-grade ores require processing larger volumes of ore to extract the same amount of copper, meaning that water intensity per unit of copper production is still rising.

The Chilean Copper Commission (Cochilco) forecasts that water demand in the mining sector will grow from 18.8 m³/s in 2023 to 22.1 m³/s in 2034, an increase of 17.6%, with this growth almost entirely driven by process water for extraction and beneficiation, rather than simple capacity expansion.

The response: desalination, reuse, and closed-loop systems

Faced with this structural contradiction, Chile’s mining industry has charted a relatively clear path over the past five years, centered on “seawater replacing freshwater + maximizing tailings water recovery.”

Seawater desalination is becoming the primary water source. Cochilco data show that the share of seawater desalination and reuse water in northern Chilean mining water supply rose from 25% in 2020 to 40% in 2024, and is expected to exceed 65% by 2032; by 2034, the proportion of mining water coming from the ocean is projected to reach 66% nationwide.

The actions of leading mining companies confirm this trend: Antofagasta Minerals commissioned a USD 2 billion seawater desalination plant at its Los Pelambres copper mine in 2024, built by Bechtel, with a capacity of 400 L/s, set to double by 2027; BHP’s Escondida mine has gone a step further, directly using untreated seawater for ore processing, reducing freshwater intake to zero; Collahuasi is constructing a seawater desalination project expected to meet most of its industrial water demand by 2026; Codelco has also begun sharing desalination infrastructure among three northern mines to spread the capital costs of individual projects.

Tailings water recovery is another parallel mainstay. Modern tailings thickening and multi-stage treatment processes are turning tailings storage facilities from “water black holes” into “water banks.”

Industry data show that tailings water recovery rates after multi-stage treatment generally exceed 75%, and some closed-loop systems incorporating membrane treatment and crystallization optimization can achieve above 85%; Anglo American’s El Soldado mine has already achieved an 80% process water recovery rate; compared to conventional wet tailings storage, thickened tailings processes can reduce overall water losses by approximately 10%. Some mining sites are also installing floating photovoltaic panels on tailings ponds to suppress evaporation, further reducing water losses.

Cochilco’s latest survey, released in 2025, covered 49 major mining projects and reported that recycled circulating water volume reached 55.75 m³/s in that year, a year-on-year increase of 2.9%, and more than three times the volume of fresh water intake — meaning that “for every new drop of water taken, three drops of old water are reused” has become the industry norm in Chilean copper mining, rather than an exception limited to a few benchmark projects.

What this means for water treatment suppliers

Cochilco estimates that Chile’s mining investment pipeline from 2024 to 2033 amounts to as much as USD 83.2 billion, of which approximately USD 66.6 billion is earmarked for expansion and retrofitting of existing mines and USD 15.2 billion for new projects — water infrastructure (desalination, transmission pipelines, tailings thickening and treatment) is one of the most certain and rigid components of this investment cycle.

For water treatment technology companies, the real opportunity extends beyond “building a seawater desalination plant” and lies across the entire value chain: tailings thickening and dewatering equipment, corrosion-resistant membrane materials, energy consumption optimization control systems, and engineering integration capabilities for shared desalination infrastructure among multiple mines — all of which are the segments where Chilean mining has concentrated its investment and shown the greatest willingness to pay for efficiency over the past few years.

Track 2: The “Anaerobic + Resource Recovery” Logic in Brazilian Food Processing

A massive, yet often overlooked, source of industrial wastewater

Brazil is one of the world’s largest agricultural exporters, ranking first globally in production of soybeans, coffee, sugar, and citrus, and second in beef and chicken; the domestic food giant JBS is also one of the world’s largest meat and food companies, with annual revenue exceeding BRL 350 billion and approximately 400 physical factories worldwide.

A food processing industry of this scale generates an equally massive volume of high-strength organic wastewater: globally, the meat processing industry consumes about 62 million m³ of water annually, of which only a small fraction actually ends up in the final product, with the vast majority discharged as wastewater.

Unlike mining wastewater, which is dominated by suspended solids and heavy metals, food processing wastewater (from slaughterhouses, dairy, sugar-ethanol, soybean processing, etc.) is generally characterized by high COD, high BOD, and high oil and grease content. If discharged directly, this type of wastewater rapidly depletes dissolved oxygen in receiving water bodies, causing severe eutrophication.

Anaerobic reactors: the technological backbone of Brazilian food processing wastewater treatment

Facing this type of high-strength organic wastewater, the industry has developed a relatively mature technological pathway:

high-load anaerobic reactors, typified by UASB (Upflow Anaerobic Sludge Blanket), serve as the primary treatment workhorse, paired with subsequent aerobic polishing to form an “anaerobic + aerobic” combined process.

UASB reactors rely on granular sludge to achieve efficient anaerobic digestion; under reasonable loading conditions, COD removal rates can be stably maintained in the range of 75%–95%. The biogas generated during the process can also be recovered for on-site energy supply, creating a virtuous cycle of “treatment as energy production.”

This technical route is particularly well-suited for high-strength organic wastewater scenarios such as slaughterhouses, dairy, and alcohol/sugar production, and is currently the mainstream choice for upgrading and retrofitting food processing facilities in Brazil and across Latin America.

A representative practical case comes from a plant owned by Brazilian meat processor BRF (Brasil Foods):

through a systematic retrofit of its water resource and wastewater management system, the plant converted sludge generated from physicochemical wastewater treatment into energy, while simultaneously implementing “cleaner production” principles to reduce fresh water consumption intensity.

The underlying logic of such projects is to transform wastewater treatment from a mere compliance expense into a dual optimization tool for both energy and water costs.

Policy and financing: Brazil’s unique leverage

Brazil has two institutional designs worth noting in the wastewater treatment field. The first is the PRODES program, managed by the National Water Agency (ANA) since 2001, which is a federal funding mechanism based on “payment for performance”:

as long as effluent quality meets the standards, wastewater treatment facilities can receive staggered repayments of up to half of their investment costs; if they fail to meet standards consecutively, funding is suspended or even cancelled — this mechanism directly links operators’ interests with environmental compliance outcomes, and the same logic is being extended to financing discussions for industrial wastewater treatment.

Second, through regulations such as CONAMA Resolution №430, Brazil’s Ministry of Environment has established relatively clear water quality discharge thresholds, providing a regulatory basis for compliance retrofitting by food processing companies. In addition, the Brazilian government’s recent “Nova Indústria Brasil” (New Industry Brazil) plan explicitly identifies sustainable, digitalized agricultural processing chains and decarbonization transitions as priority support areas, and has concurrently established climate funds and critical minerals funds — this creates a policy window for food processing companies to introduce more advanced wastewater-to-resource technologies.

Conclusion: Two climates, one common trend

Chilean copper mining is located in the world’s driest desert region, and its solutions combine both “opening new sources” (seawater desalination) and “reducing consumption” (tailings water recovery); Brazilian food processing, by contrast, sits in a relatively water-abundant tropical region, where the challenge lies not in water scarcity, but in how to treat high organic loads and recover the energy and nutrients embedded in the wastewater. The two scenarios appear superficially unrelated, yet they point to the same industrial trend: industrial wastewater treatment is shifting from an end-of-pipe compliance “cost center” to a “resource efficiency investment” running throughout the entire production process.

For water treatment technology companies, engineering contractors, and investors focused on the Latin American market, this implies a clear judgment: the real market opportunity does not lie in speaking broadly about the “Latin American water market,” but rather in deeply understanding the respective water quality characteristics, technological pathways, and policy levers of the mining and food processing sectors — the two export pillar industries — and making targeted product and service deployments accordingly.