Harare's waste crisis is usually told as a story about council trucks and dumpsites, but researchers who have actually studied what happens inside people's homes point to something more basic: almost nobody separates their rubbish before it leaves the yard, and that single habit shapes everything downstream.
A study published by Allied Academies looking specifically at household solid waste management in Harare found that around 90 percent of collected waste is dumped without any separation at the city's official sites, with only about a tenth going through recycling, composting, reusing or other value-added processes. The paper describes households using plastic receptacles supplied by city authorities to hold everything together, food scraps, plastics, glass, paper, with no sorting step in between. That single-bin habit is not unique to Harare: a separate study of households in Nkayi growth point found 86 percent of respondents did not segregate their waste at all, and among those who explained why, 62 percent said they saw segregation and recycling as too time-consuming to be worth the effort.
That perception matters because the payoff from sorting at home is real and well documented. Academic research into composting peri-urban Harare household waste, published in the International Journal of Recycling of Organic Waste in Agriculture, found that mixing household organic waste with about 30 percent straw produced the best results as a soil amendment, effectively reducing nitrogen losses compared with other mixture ratios tested. The same research is specific about safety: compost needs to reach temperatures above 55 degrees Celsius for at least three consecutive days to destroy weed seeds and disease-causing pathogens before it is safe to use in a garden or on food crops.
A broader review published in Discover Environment, looking at high-density suburbs in Kwekwe, reinforces why this matters at city scale. The researchers found that composting converts biodegradable waste into usable organic manure, cutting the need for synthetic fertiliser, but that recovery of that value is consistently limited by poor waste segregation across sub-Saharan African households generally. Source separation, the practice of sorting waste into categories before collection, is what makes recycling, composting and reuse practical in the first place; without it, recoverable material simply gets buried or burned along with everything else.
Simple steps that make a real difference
Based on what the research identifies as the actual bottlenecks, a few household habits go furthest:
- Keep a separate container for food scraps, vegetable peels and garden trimmings rather than mixing them with plastics and packaging; this is the material composting research shows can be converted into usable soil amendment.
- If composting at home, mix in a carbon source such as dry grass or straw, roughly the 30 percent ratio researchers found most effective, and turn the pile regularly to help it reach the temperatures needed to kill off pathogens and weed seeds.
- Rinse and set aside recyclable plastics and glass rather than binning them wet or contaminated with food waste, since contamination is one of the reasons cited for Harare's low overall recycling rate.
- Where informal collectors or community recycling points exist nearby, such as Harare's Willowvale Road initiative, pre-sorted plastic is worth more to them and easier to process than mixed rubbish pulled straight from a dumpsite.
None of this replaces the need for reliable council collection. But the research is consistent on one point: segregation at the household level is the step that makes every later stage of recycling and composting possible, and right now it is the step Harare is skipping almost entirely.
Sources
- Household solid waste management: how effective are the strategies used in Harare Zimbabwe?, Allied Academies
- Management of solid waste by households at Nkayi growth point in Zimbabwe, ScienceDirect
- Composting of selected organic wastes from peri-urban areas of Harare, Zimbabwe, International Journal of Recycling of Organic Waste in Agriculture
- Impacts of solid waste management strategies in urban high density suburbs: a case of Amaveni suburb, Kwekwe, Zimbabwe, Discover Environment / Springer Nature Link
Written by Rufaro
Plain-language guides to getting rid of anything in Zimbabwe, properly.
