Foodenv Reference

---
name: foodenv-reference
description: "Use when checking what is live (recycling economics and extended producer responsibility, and PFAS in biosolids, verified August 2026), correcting a food, cleaning or waste misconception, looking up a temperature, concentration or dilution figure, finding the books, or needing a picker and the non-negotiables list. Companion to the other cooking-cleaning-waste-sciences skills."
---

# Cooking, Cleaning and Waste Sciences: What's Live, Misconceptions, and Numbers

> **Part 5 of 5** of the *Cooking, Cleaning and Waste Sciences* reference (plugin `cooking-cleaning-waste-sciences`), covering §29–§34. Sibling skills: `foodenv-food-science` (§0–§11), `foodenv-food-safety-and-food-service` (§12–§18), `foodenv-cleaning-chemistry` (§19–§23), `foodenv-wastewater-and-waste-management` (§24–§28). Section numbers are shared across the set; a reference written as §N → `skill` points into that sibling skill.
>
> **Currency:** The chemistry and the food-safety thresholds are settled. Two areas are live. See §29 below for recycling economics and EPR, and PFAS in biosolids.

> **⚠️ One domain, three stages: transform the food, clean up after it, deal with what's
> left.** **Complements an agriculture reference (where the food comes from) and a
> chemistry reference (the underlying reactions).**
>
> **⚠️ Two safety items stated up front, because both can kill and both are common:**
> - ⚠️ **NEVER mix bleach with ammonia, or bleach with acids** (§22 → `foodenv-cleaning-chemistry`). **These produce
>   toxic gases in ordinary domestic quantities.**
> - ⚠️ **The food-safety temperatures in §12 → `foodenv-food-safety-and-food-service` are not suggestions.** **They are the output
>   of pathogen destruction curves.**
>
> **⚠️ GOTCHA** boxes mark folklore that is wrong, and things that hurt people.
>
> **The three ideas that organize this document:**
> 1. **⚠️ Cooking is heat transfer plus chemistry, and almost every technique question is
>    really a heat-transfer question** (§2 → `foodenv-food-science`). **Understanding that replaces a hundred
>    memorized rules.**
> 2. **⚠️ Cleaning is chemistry matched to soil type** (§20–§21 → `foodenv-cleaning-chemistry`). **"Stronger cleaner"
>    is usually the wrong answer; "right chemistry" is usually the right one.**
> 3. **⚠️ The waste hierarchy is ordered by actual impact, and public attention is
>    inverted relative to it** (§25 → `foodenv-wastewater-and-waste-management`). **Recycling gets the attention; reduction and reuse
>    do the work.**

---

## §29. What's Live — verified August 2026

### 29.1 ⚠️ Recycling economics and EPR
**⚠️ The policy structure changed substantially; whether it changes outcomes is genuinely
disputed, including by people inside the industry.**

- **⚠️ 2025 was rough.** **Plastics recyclers were described as completing "the worst year
  to date" in December 2025, amid cheap virgin and imported resin.** ⚠️ **This is the core
  economic problem: recycled plastic competes against virgin plastic priced off oil, and
  when oil is cheap, recycling loses.**
- **⚠️ Seven states now have packaging EPR laws** — **producer-funded programs where
  producers pay material-specific fees to a Producer Responsibility Organization (the
  Circular Action Alliance being the first approved US PRO).** ⚠️ **2026 is a major
  compliance year**: **California's SB 54 moving toward full implementation, its SB 343
  labeling law nearing enforcement, Oregon and Colorado fee schedules landing, and the
  EU's Packaging and Packaging Waste Regulation taking effect 12 August 2026.**
- **⚠️ Compliance complexity is real**: **state programs define producers differently and
  use material categories ranging from roughly 65 to 95** — ⚠️ **and legislative
  turbulence continues, with 2026 bills dying in committee in several states and a
  February 2026 federal preliminary injunction blocking enforcement of Oregon's program
  against one trade association's members.**

> **⚠️ GOTCHA — recycling rate figures vary enormously depending on what's being
> measured, and the gap is the whole story.** ⚠️ **One industry account states that at
> least 70% of what goes into the bin ultimately gets recycled, with the remainder largely
> contamination.** **⚠️ But a 2024 national report found US residents recycled only 28% of
> PET bottles, 32% of cardboard boxes and 30% of aluminium cans.**
> ⚠️ **These are not contradictory — they measure different things: what happens to
> material ONCE COLLECTED versus what fraction of material in circulation gets collected
> at all.** **The binding constraint is CAPTURE, not sorting.** ⚠️ **When someone quotes a
> recycling rate, ask which one they mean.**

**⚠️ And the honest industry view on whether EPR will help**: **at a February 2026
conference, when audience members asked speakers directly whether EPR would boost
recycling rates, ⚠️ they were "generally met with skeptical responses."** **The stated
reason is the one that matters: ⚠️ EPR funds collection, but without DEMAND for recycled
material you end up with more material and nowhere for it to go.** **The Association of
Plastic Recyclers' stated 2026 priority is accordingly incentivizing demand for
domestically sourced recycled plastic, not collection.**

### 29.2 ⚠️ PFAS in biosolids
**⚠️ Roughly 60% of US biosolids are land-applied as fertilizer, and whether that is safe
is now an actively contested federal question.**

- **⚠️ In January 2025 EPA released a 272-page draft risk assessment for PFOA and PFOS in
  sewage sludge**, **which concluded that land application of PFAS-containing biosolids
  could create health risks for people relying on contaminated farmland for food and
  drinking water** — ⚠️ **in some cases reported as several orders of magnitude above
  thresholds EPA deemed acceptable.** **It did not find sufficient evidence that the
  general food supply from such farms was contaminated.**
- **⚠️ It was never finalized.** **It drew over 25,000 comments; ⚠️ in July 2026 EPA
  announced it was replacing it with a nine-page draft guidance document, saying the
  earlier assessment had "serious flaws" and that the new document better reflects
  real-world conditions.**
- **⚠️ The replacement is VOLUNTARY and NON-BINDING.** **"Reducing Risk from PFOA and PFOS
  in Biosolids" offers recommendations rather than enforceable standards, does not
  quantify risks, and ⚠️ clarifies EPA's support for continued land application pending a
  decision on whether to regulate.** **Comment period ran to 4 September 2026.**

> **⚠️ GOTCHA — this is contested policy and I'm going to present it as contested rather
> than resolved.** ⚠️ **EPA frames the change as correcting a flawed assessment with a more
> realistic one.** **Critics — including environmental groups, some local governments and
> Maine farmers in litigation — frame it as replacing enforceable protection with voluntary
> guidance and shifting burden onto the public.** ⚠️ **A federal judge dismissed one suit
> in October 2025, finding that while the Clean Water Act requires EPA to review sludge
> regulations biennially, it does not mandate regulating identified pollutants within any
> particular timeframe.** **⚠️ That is a genuinely important legal point: the review duty
> and the regulate duty are separable.**

**⚠️ Meanwhile states are acting independently, producing a patchwork** — **New York
requiring PFAS testing for composters using biosolids, Maryland legislation proposed to
ban land application above 50 ppb PFOA/PFOS, Mississippi proposing annual testing.**
⚠️ **Practical read: if you land-apply biosolids or buy bagged biosolid-based products,
this is unsettled, jurisdiction-dependent, and worth watching.** **The technical mitigation
options under discussion are lined landfills, performance-tested incinerators, and
emerging PFAS destruction technologies.**

---

## §30. Misconceptions

| Misconception | Correction |
|---|---|
| Searing seals in juices | ⚠️ **False. Sear for flavour** (§3 → `foodenv-food-science`) |
| Well-done meat is dry from losing fat | ⚠️ **Actin denatures ~60°C and squeezes out water** (§3 → `foodenv-food-science`) |
| Onions caramelize in 10 minutes | ⚠️ **45+ minutes, and it's Maillard plus caramelization** (§4 → `foodenv-food-science`) |
| Maillard and caramelization are the same | ⚠️ **Different reactions; Maillard needs protein** (§4 → `foodenv-food-science`) |
| Bread stales from drying out | ⚠️ **Starch retrogradation — faster in the fridge** (§5 → `foodenv-food-science`, §11 → `foodenv-food-science`) |
| Salt just before cooking | ⚠️ **Well ahead or at the pan; the middle is worst** (§7 → `foodenv-food-science`) |
| A tablespoon of salt is a tablespoon of salt | ⚠️ **Brands differ nearly 2× by weight** (§7 → `foodenv-food-science`) |
| Add tomatoes early to the beans | ⚠️ **Acid slows softening dramatically** (§8 → `foodenv-food-science`) |
| Wash raw chicken | ⚠️ **Aerosolizes contamination; doesn't reduce risk** (§14 → `foodenv-food-safety-and-food-service`) |
| Gloves replace handwashing | ⚠️ **Contaminated gloves transfer just as well** (§14 → `foodenv-food-safety-and-food-service`) |
| Reheating makes old food safe | ⚠️ **Staph toxin is heat-stable** (§12 → `foodenv-food-safety-and-food-service`) |
| Cooking is where food safety fails | ⚠️ **COOLING is** (§12 → `foodenv-food-safety-and-food-service`) |
| Low food-cost % is the goal | ⚠️ **You bank dollars, not percentages** (§17 → `foodenv-food-safety-and-food-service`) |
| Stronger cleaner works better | ⚠️ **Match chemistry to soil type** (§20 → `foodenv-cleaning-chemistry`) |
| Vinegar cleans everything | ⚠️ **Useless on grease; etches stone** (§20 → `foodenv-cleaning-chemistry`) |
| Hot water for blood stains | ⚠️ **Cooks protein onto fibre. Use cold** (§20 → `foodenv-cleaning-chemistry`, §23 → `foodenv-cleaning-chemistry`) |
| Mixing cleaners makes them stronger | ⚠️ **It makes toxic gas** (§22 → `foodenv-cleaning-chemistry`) |
| Spray and wipe disinfects | ⚠️ **Dwell time; surface must stay wet** (§22 → `foodenv-cleaning-chemistry`) |
| Disinfect a dirty surface | ⚠️ **Organic soil inactivates disinfectants. Clean first** (§22 → `foodenv-cleaning-chemistry`) |
| 100% alcohol is the best sanitizer | ⚠️ **60–90% works better** (§22 → `foodenv-cleaning-chemistry`) |
| More detergent cleans better | ⚠️ **Residue attracts soil** (§23 → `foodenv-cleaning-chemistry`) |
| Flushable wipes are flushable | ⚠️ **They cause fatbergs and pump damage** (§24 → `foodenv-wastewater-and-waste-management`) |
| Landfills break waste down | ⚠️ **They're designed to entomb; decades-old food is identifiable** (§26 → `foodenv-wastewater-and-waste-management`) |
| "Biodegradable" helps in a landfill | ⚠️ **It doesn't decompose there, and may make methane** (§26 → `foodenv-wastewater-and-waste-management`) |
| The number in the triangle means recyclable | ⚠️ **It's a resin ID code** (§27 → `foodenv-wastewater-and-waste-management`) |
| Put it in the bin and hope | ⚠️ **Wishcycling contaminates whole loads** (§27 → `foodenv-wastewater-and-waste-management`) |
| Recycling is the top green action | ⚠️ **Third tier. Reduce and reuse beat it** (§25 → `foodenv-wastewater-and-waste-management`) |
| All plastics get recycled | ⚠️ **Realistically #1 and #2; the rest lack markets** (§27 → `foodenv-wastewater-and-waste-management`) |
| There's one US recycling rate | ⚠️ **Capture vs sorting are different numbers** (§29.1) |
| Biosolid PFAS rules are settled | ⚠️ **Voluntary guidance; actively contested** (§29.2) |

---

## §31. Numbers

```
COOKING
⚠️ Myosin ~50°C · actin ~60°C · collagen→gelatin ~68°C+ with time
⚠️ Maillard meaningfully from ~140°C/285°F · caramelization (sucrose) ~160°C
⚠️ Carryover cooking 5–15°F depending on size and oven temperature
FOOD SAFETY
⚠️ DANGER ZONE 40–140°F / 4–60°C · ⚠️ 2-hour rule (1 hour above 90°F)
⚠️ Poultry/leftovers 165°F · ground meat 160°F · whole muscle & fish 145°F+rest
⚠️ COOLING 135→70°F in 2h, 70→41°F in 4h more
⚠️ Hot hold ≥135°F · cold hold ≤41°F · handwash 20 seconds
RESTAURANT
⚠️ Prime cost target ~60–65% of sales · food ~28–35% · labour ~25–35%
⚠️ Net margin commonly low-to-mid single digits
CLEANING
⚠️ Sinner's circle: chemistry · mechanical · temperature · time
⚠️ Alcohol sanitizer 60–90% (not 100%)
COMPOST  ⚠️ C:N ~25–30:1 · moisture 50–60% · thermophilic 130–160°F
WASTEWATER ⚠️ primary ~30% BOD removal · secondary ~85–95%
WASTE  ⚠️ landfill gas ~50% methane · organics ≈ largest MSW category (~1/3)
⚠️ US capture rates (2024 report): PET bottles 28% · cardboard 32% · cans 30%
⚠️ ~60% of US biosolids land-applied (§29.2)
```

---

## §32. Books

| Author | Work | Why |
|---|---|---|
| **McGee** | ***On Food and Cooking*** | ⚠️ **THE food science reference. Start here** |
| **López-Alt** | ***The Food Lab*** | ⚠️ **Tests the folklore. §3 → `foodenv-food-science`'s searing myth among others** |
| **This** | *Molecular Gastronomy* | The chemistry, rigorously |
| **Ruhlman** | *Ratio* | ⚠️ **Baking by proportion rather than recipe** |
| **Katz** | *The Art of Fermentation* | §10 → `foodenv-food-science` |
| **NCHFP / USDA** | ***Complete Guide to Home Canning*** | ⚠️ **Free, and the authority for §10 → `foodenv-food-science`'s botulism risk** |
| **ServSafe** | *Manager* coursework | §12–§14 → `foodenv-food-safety-and-food-service`, and often legally required |
| **Dornenburg & Page** | *The Flavor Bible* | §9 → `foodenv-food-science`, practically |
| **Tchobanoglous et al.** | *Wastewater Engineering* / *Integrated Solid Waste Management* | ⚠️ **The §24–§27 → `foodenv-wastewater-and-waste-management` references** |

**⚠️ Also free and authoritative**: **FDA Food Code and your local health department;
USDA FSIS temperature guidance; ⚠️ your municipality's actual recycling list (§27 → `foodenv-wastewater-and-waste-management` — rules
are local and no general source substitutes); and EPA's waste and biosolids pages.**

---

## §33. Quick Reference

### 33.1 Picker
| Question | Where |
|---|---|
| Meat came out tough | ⚠️ **Wrong cut/method pairing — collagen needs time** (§3 → `foodenv-food-science`) |
| Food won't brown | ⚠️ **Wet surface or crowded pan** (§2 → `foodenv-food-science`, §4 → `foodenv-food-science`) |
| Sauce broke | ⚠️ **Re-emulsify slowly into a fresh base** (§6 → `foodenv-food-science`) |
| Dish tastes flat | ⚠️ **Salt, then acid** (§9 → `foodenv-food-science`) |
| Is this leftover safe? | ⚠️ **Time in the danger zone, not smell** (§12 → `foodenv-food-safety-and-food-service`) |
| Big pot of hot stew to store | ⚠️ **Shallow pans / ice bath. Don't fridge it whole** (§12 → `foodenv-food-safety-and-food-service`) |
| Grease won't shift | ⚠️ **Alkaline cleaner, not vinegar** (§20 → `foodenv-cleaning-chemistry`) |
| Limescale won't shift | ⚠️ **Acid, not bleach** (§20 → `foodenv-cleaning-chemistry`) |
| Blood/egg/milk stain | ⚠️ **COLD water + enzyme** (§20 → `foodenv-cleaning-chemistry`, §23 → `foodenv-cleaning-chemistry`) |
| Disinfectant not working | ⚠️ **Clean first; respect dwell time** (§22 → `foodenv-cleaning-chemistry`) |
| Can I mix these two cleaners? | ⚠️ **No** (§22 → `foodenv-cleaning-chemistry`) |
| Is this recyclable? | ⚠️ **Check your municipality. When in doubt, bin it** (§27 → `foodenv-wastewater-and-waste-management`) |
| Compostable packaging, no program | ⚠️ **Landfill. It won't compost there** (§26 → `foodenv-wastewater-and-waste-management`, §28 → `foodenv-wastewater-and-waste-management`) |
| Most impactful waste change? | ⚠️ **Reduce food waste; reduce and reuse before recycling** (§25 → `foodenv-wastewater-and-waste-management`) |

### 33.2 ⚠️ Non-negotiables
- [ ] ⚠️ **Never mix bleach with ammonia or acid** (§22 → `foodenv-cleaning-chemistry`)
- [ ] ⚠️ **Cook to temperature; use a thermometer, not colour** (§12 → `foodenv-food-safety-and-food-service`)
- [ ] ⚠️ **Cool 135→70→41°F on the clock** (§12 → `foodenv-food-safety-and-food-service`)
- [ ] ⚠️ **2-hour danger zone limit** (§12 → `foodenv-food-safety-and-food-service`)
- [ ] Raw below ready-to-eat in the fridge (§14 → `foodenv-food-safety-and-food-service`)
- [ ] ⚠️ **Handwash 20s; gloves aren't a substitute** (§14 → `foodenv-food-safety-and-food-service`)
- [ ] ⚠️ **Tested procedures for home canning — botulism** (§10 → `foodenv-food-science`)
- [ ] ⚠️ **Clean before disinfecting; honour dwell time** (§22 → `foodenv-cleaning-chemistry`)
- [ ] ⚠️ **Lithium batteries never in the recycling or trash bin — fire** (§27 → `foodenv-wastewater-and-waste-management`)
- [ ] Only urine, faeces, toilet paper down the toilet (§24 → `foodenv-wastewater-and-waste-management`)

---

## §34. Method

**§1–§28 → `foodenv-food-science`, `foodenv-food-safety-and-food-service`, `foodenv-cleaning-chemistry`, `foodenv-wastewater-and-waste-management` rest on stable material** — **heat transfer, food chemistry, pathogen destruction
curves, surfactant chemistry, and sanitary engineering** — sourced from §32. ⚠️ **The FDA
temperature thresholds and the reaction temperatures have not moved and are the least
negotiable content here.**

**Two searches were run in August 2026**, on **recycling economics and EPR** and **PFAS in
biosolids** — ⚠️ **the two areas where the policy landscape moved recently and materially.**

**Confidence.** **High** in §2–§11 → `foodenv-food-science`'s chemistry, and §2 → `foodenv-food-science` is the section I'd most want read:
⚠️ **framing cooking as heat transfer replaces a large number of memorized rules with one
model**, **and the evaporative-cooling point explains browning failures better than any
technique instruction.**

**High** in §12 → `foodenv-food-safety-and-food-service`'s numbers, which come from FDA/USDA guidance. ⚠️ **The claim I'd emphasise
is that COOLING, not cooking, is where commercial food safety most often fails** —
**it's well documented in inspection data and it's counterintuitive.**

**High** in §20 → `foodenv-cleaning-chemistry` and §22 → `foodenv-cleaning-chemistry`. ⚠️ **The soil-type-to-chemistry matching table is the single most
practically useful thing in Part IV**, **and the mixing dangers are standard, well-
established safety information that I've stated as prominently as I know how.**

**High** in §26 → `foodenv-wastewater-and-waste-management`'s entombment point and §27 → `foodenv-wastewater-and-waste-management`'s resin-code correction — ⚠️ **both are
well-documented and both are very widely misunderstood.**

**Moderate-to-high** in §29.1. ⚠️ **The apparently contradictory recycling numbers — "at
least 70% of what you put in the bin gets recycled" versus "28% of PET bottles, 32% of
cardboard, 30% of cans" — are from different sources measuring different things, and
reconciling them (post-collection fate versus capture rate) is my interpretation.**
**I think it's right and it's the key to reading any recycling statistic.** ⚠️ **Note the
sourcing: the 70% figure comes from industry commentary and the capture figures from a
recycling-advocacy report, and both have positions.** **The industry scepticism about
whether EPR will raise rates is directly reported from a February 2026 conference and is
notable precisely because it comes from inside the industry.**

⚠️ **§29.2 is deliberately presented as contested policy rather than settled fact, and
that's a judgement I'd defend.** **The sequence is documented — January 2025 draft risk
assessment, 25,000+ comments, July 2026 replacement with nine-page voluntary guidance,
comment period to 4 September 2026.** ⚠️ **The characterizations differ sharply by source:
EPA says it is correcting serious flaws; critics say it substitutes voluntary guidance for
enforceable protection.** **I've given both and attributed both, and I've included the
October 2025 ruling separating EPA's biennial review duty from any duty to regulate,
because that legal point explains why the situation can persist.** ⚠️ **I've not attempted
to adjudicate the underlying toxicology.**