TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The mole ratio of tannin to N,N-(dimethylaminoethyl)methacrylate is 1:0.5-1:5.0. The pH of the wastewater is adjusted from 2-11. The coagulant composition is added in an amount of 1-1000 ppm by volume. The solid waste materials are separated from the wastewater by settling or flotation; or are separated in a centrifuge. The solid waste materials are heated from 80-90 degrees C. The method (M1) further involves: adding an acid (0.001-0.3 g) to the solid waste materials before heat treatment. Preferred Components: The cationic monomer comprises an ethylenically unsaturated quaternary ammonium ion, ethylenically unsaturated quaternary phosphonium ion or ethylenically unsaturated quaternary sulfonium ion (preferably selected from methyl chloride quaternary salt of diethylaminoethyl acrylate, dimethyl sulfate salt of diethylaminoethyl acrylate, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, dimethylaminopropyl methacrylamide, dimethylaminopropyl acrylamide, diallyldimethyl ammonium chloride and diallyldiethyl ammonium chloride). The ethylenically unsaturated quaternary ammonium ion monomer comprises a quaternary ammonium salt of dialkylaminoalkyl(meth)acrylamide, dialkylaminoalkyl(meth)acrylate or diallyl dialkyl ammonium chloride. The anionic monomer is an ethylenically unsaturated carboxylic acid or a sulfonic acid functional group. The nonionic monomer is an ethylenically unsaturated nonionic monomer. The acid is a mineral acid or an organic acid (preferably sulfuric acid, hydrochloric acid, nitric acid, acetic acid, citric acid and tartaric acid).    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The composition comprises a copolymer of a tannin and a cationic monomer (preferably N,N-(dimethylaminoethyl)methacrylate and tannin polymer); and further comprises flocculant (1-80 wt.%). Preferred Components: The copolymer comprises tannin (10-80 wt.%), cationic monomer (20-90 wt.%), nonionic monomer (0-30 wt.%) and anionic monomer (0-20 wt.%). The copolymer further comprises an anionic monomer, and/or nonionic monomer. The flocculant is a copolymer containing dimethylaminoethyl methacrylate, acrylamidopropyltrimethyl ammonium chloride, methacrylamidopropyltrimethyl ammonium chloride, acrylamidopropyl sulfonate, acrylamide and/or acrylic acid. EXAMPLE - A coagulant composition was prepared by mixing N,N-(dimethylaminoethyl)methacrylate and tannin (tannin-PolyMADAME) (200 ppm), 10/90 methyl chloride quaternary salt of dimethylaminoethyl acrylate/acrylamide copolymer (29 ppm) and 39/61 acrylic acid/acrylamide copolymer (19 ppm). The coagulant composition was added to beef wastewater that was flowing through a 50 gallon per minute (gpm) Entrapped Air Flotation (EAF) unit. Lab efficacy test was carried out on treated beef wastewater and for untreated beef wastewater sample. The results showed that the coagulant of 248/0 ppm, biochemical oxygen demand-5 (BOD-5) of 3425/8825 mg/l, total suspended solid (TSS) of 1230/3875 mg/l, fats, oil and grease (FOG) of 1090/2375 mg/l, total kjeldhal nitrogen (TKN) of 220/358 mg/l and total phosphorus (TP) of 64/62 mg/l for treated beef waste water/untreated beef waste water respectively. A small portion of the solid phase that floated up during the untreated beef waste water sample and treated beef waste water sample was transferred to two graduated glass centrifuge tubes, forming untreated beef waste water extract (control) and treated beef wastewater extract (test), respectively. The exact weight of the solids transferred was recorded. The centrifuge tubes were put in an open steam bath and the tubes were heated until the temperature in the mid-section for the solids was 85 plus minus 2 degrees C. The centrifuge tubes were removed on attaining 85 plus minus 2 degrees C. On removing the centrifuge tubes from the steam bath, both extracts were immediately transferred to a bench-top centrifuge and were spun at 1600 plus minus 100 G for 10 minutes. The centrifuging process separated the solid phase into three distinct layers, tallow, water and solids. In the treated waste water and untreated waste water, tallow recovered was 44.4, 20.3 and 8.2; and 11.5, 11.5 and 9.9 kg/hours after 19, 41 and 84 days from trial respectively.