humanitarian · water
thousands of litres of sewage, no way to treat it
Humanitarian camps generate thousands of liters of faecal sludge daily but have no field-deployable way to treat it safely
Problem statement
Refugee camps and disaster-affected areas housing tens of thousands of people generate enormous volumes of faecal sludge from pit latrines, septic tanks, and holding tanks. In a camp of 20,000 people, this can exceed 10,000 liters per day. Current emergency response relies on desludging trucks to transport waste to distant disposal sites — often open pits or poorly managed landfills that contaminate groundwater and surrounding communities. When trucks break down, fuel runs short, or disposal sites reach capacity, untreated sludge accumulates in the camp. UNICEF's TPP calls for field-deployable treatment products that can process faecal sludge to safe discharge or reuse standards, either on-site beside the toilets or at an off-site treatment location, but no product meeting emergency deployment requirements exists at scale.
Why this matters
Inadequately managed faecal sludge is a primary driver of disease outbreaks in displaced populations. Cholera, typhoid, and hepatitis outbreaks in refugee camps are frequently traced to faecal contamination of water sources and living environments. The problem compounds over time: camps originally planned for months often persist for years or decades, and the sludge management systems designed for short-term use deteriorate. With over 100 million people forcibly displaced worldwide as of 2024, the volume of untreated faecal waste generated in humanitarian settings is a public health crisis that is both growing and systematically under-addressed.
What’s been tried and why it hasn’t worked
Conventional wastewater treatment plants require permanent infrastructure, continuous power, skilled operators, and months of construction — incompatible with emergency timelines. Waste stabilization ponds (the simplest treatment approach) require large land areas that are often unavailable in congested camp settings. Lime treatment can disinfect sludge but produces large volumes of alkaline waste that must be disposed of, does not reduce volume, and requires ongoing chemical supply chains. Small-scale constructed wetlands and planted drying beds work in development contexts but take weeks to establish and months to achieve treatment capacity. Pit additives (marketed as accelerating decomposition) have shown limited efficacy in controlled trials. The unifying failure mode is that all proven treatment technologies assume either permanent infrastructure, large land availability, long setup times, or continuous supply chains — none of which exist in acute emergency settings.
What would unlock progress
The UNICEF TPP specifies: rapid setup (days, not weeks), compact footprint, ideally no external power supply, achieves pathogen reduction to its treatment objectives (E. coli below 100 CFU per 100 ml in the liquid effluent and fewer than 1 helminth egg per gram in the solids), operable by non-specialist staff, and transportable on pallets or in boxes of 100 kg or less that fit on a pick-up truck. Promising approaches include: (1) thermal treatment units (e.g., the Janicki Omni Processor concept — burning dried sludge to generate energy), (2) chemical-thermal lime stabilization with heat recovery, (3) membrane bioreactors scaled for containerized deployment, and (4) electrochemical treatment using solar-powered electrode systems. None has been validated for the specific combination of throughput, pathogen reduction, and field conditions the humanitarian context demands.
Entry points for student teams
A team could design and test a solar-powered electrochemical faecal sludge treatment unit sized for a 500-person camp section (~250 liters/day), measuring pathogen log reduction (E. coli as indicator), chemical oxygen demand removal, and energy consumption. The engineering challenge is achieving adequate treatment at throughput scales compatible with camp operations while running entirely on solar power. Alternatively, a team could prototype a containerized lime-thermal treatment system that combines quickite lime addition with passive solar heating, measuring pathogen inactivation rates at different lime doses and temperatures under simulated tropical conditions. Relevant disciplines: environmental engineering, chemical engineering, humanitarian engineering, public health.
Genes
Structural cousins: stuck the same way, in other fields
Sources
UNICEF, "Target Product Profile: Faecal sludge and wastewater management in emergencies — treatment products," UNICEF Supply Division. (archived copy: ); Strande L et al., "Faecal Sludge Management: Systems Approach for Implementation and Operation," IWA Publishing, 2014. go to source 1 ↗ go to source 2 ↗
Working notes
Notes made while writing and checking this brief, shown as written. They use working shorthand.
- The 100+ million forcibly displaced people figure (UNHCR 2024) means this is not a niche problem — it affects a population larger than most countries.
- The protracted camp phenomenon (originally "temporary" settlements lasting 10-20+ years) means the emergency-to-development continuum is real: a treatment system designed for emergency deployment should also function over longer timescales.
- The Janicki Omni Processor (funded by Gates Foundation) addresses a related problem in urban LMIC settings; the humanitarian variant would need to be more portable and faster to deploy.
Reconciliation 2026-09-29: The UNICEF address on the Source line now redirects to UNICEF's general water and sanitation page, so the profile was read from the Internet Archive copy of the same page (saved 3 June 2023, https://web.archive.org/web/20230603155415/https://www.unicef.org/supply/documents/target-product-profile-faecal-sludge-and-wastewater-management-emergencies-treatment) and from the 10-page PDF linked there (UNICEF Target Product Profile, version 1.0, November 2021). Both were fetched on 2026-09-29 and read in full. The book edited by Strande, Ronteltap and Brdjanovic (IWA Publishing, 2014) was fetched the same day as full text from the OAPEN library (library.oapen.org, handle 20.500.12657/50684). Its whole text was searched by keyword and the passages around each match were read. Changes: (1) The text said the profile asks for "no requirement for grid electricity". The profile accepts a product that connects to external power and lists "no external power supply required" as the ideal (Table 3, row 2.7). The text now says "ideally no external power supply". (2) The text gave the pathogen target as ">=4 log reduction". Neither source gives that figure. The profile's targets are E. coli below 100 CFU per 100 ml in the liquid effluent and fewer than 1 helminth egg per gram in the solids (Table 4), and the text now gives those. (3) The text said the product must be "transportable in standard shipping containers". The profile asks for pallets or wooden boxes that fit on a pick-up truck, with boxes of 100 kg or less that can be carried by hand (Table 3, rows 4.1 and 4.2). The text now says that. (4) The text said waste stabilization ponds need "1-3 hectares for a mid-sized camp". Neither source gives that figure and the book does not discuss camps, so the figure was taken out. The book does say that ponds have substantial land requirements. (5) The Problem Statement said the profile calls for treatment "on-site". The profile covers two cases: a product linked directly to the toilets, and a product at a separate site that receives sludge emptied from the pits. The text now names both. (6) The archived address was added to the Source line next to the original link. Confirmed against the sources and left as written: the profile's title and issuer; the book's title, publisher and year; that UNICEF has no ready-to-deploy product that treats faecal sludge in emergencies; setup in days (7 working days acceptable, 2 ideal); the compact footprint (40 m2 or less per m3 treated per day); operation by staff without special training; that existing treatment relies on permanent infrastructure with large area needs and long construction time; that cholera outbreaks in emergencies are partly due to unsafe management of excreta; that temporary facilities can stay in use for years; the book's finding that pit additives have in general not been found effective; the book's recommended start-up of about six months for planted drying beds; and the book's description of the Janicki Industries technology that burns faecal sludge to generate electricity. The book gives a faecal sludge production rate of 1.5 litres per person per day as a design value, which puts a camp of 20,000 people above 10,000 litres per day. NOT checked: the figure of over 100 million forcibly displaced people, because the write-up cites no address for it and the UNHCR site refused automated requests. Also left as written without a source match: the name "Omni Processor" and its Gates Foundation funding; membrane bioreactors as a promising approach; camps lasting 10-20+ years; typhoid and hepatitis outbreaks in camps; the disposal of trucked sludge in open pits and landfills; and the statements that lime treatment produces large volumes of alkaline waste and does not reduce volume. A keyword search can show that a number is missing from a book, but it cannot show that a general statement is missing, so these were not changed. Genes untouched.