Page 71 - Energy from Toxic Organic Waste for Heat and Power Generation

58 Energy from Toxic Organic Waste for Heat and Power Generation

Finishing 1.0–2.0 0–2 0–5 0–2 – – – – – –

Posttanning 1.0–1.5 6–11 24–40 8–15 1–2 – 0.3–0.5 1–2 5–10 10–25
Quantity of wastewater generated and pollution load of each step during processing 1 ton of raw material [1]

Processing operations load kg per ton raw material
Chrome tanning 1.0–2.0 5–10 7–11 2–4 2–5 – 06.-0.9 0.6–0.9 40–60 30–55

Deliming and bating 1.5–2.0 8–12 13–20 5–9 – 0.1–0.3 2.6–3.9 3–5 2–4 10–26

Unhairing/liming 4.0–6.0 53–97 79–122 28–45 – 3.9–8.7 0.4–0.5 6–8 5–15 1–2

Soaking 9.0–12.0 11–17 22–33 7–11 – – 0.1–0.2 1–2 85–113 1–2

Table 5.1 Pollution load Waste water generated (m 3 or kiloliter) Suspended solids COD BOD Chromium Sulfides NH 3 –N T otal Kjeldahl nitrogen Chlorides Sulfates