Average Composition of Sewage

In Parts per 100,000

DescriptionTotal Solid Matters in SolutionOrganic CarbonOrganic NitrogenAmmoniaTotal Combined NitrogenChlorineSuspended Matters
MineralOrganicTotal
Midden Towns82·4 4·181 1·975 5·435 6·451 11·54 17·81 21·30 39·11
Water-Closet Towns72·2 4·696 2·205 6·703 7·728 10·66 24·18 20·51 44·69
In Grains per Gallon
Midden Towns57·68 2·926 1·382 3·804 4·515 8·078 12·467 14·910 27·377
Water-Closet Towns50·54 3·287 1·543 4·692 5·410 7·462 16·926 14·357 31·283
DescriptionMidden TownsWater-Closet Towns
Total Solid Matters in Solution82·4 72·2
Organic Carbon4·181 4·696
Organic Nitrogen1·975 2·205
Ammonia5·435 6·703
Total Combined Nitrogen6·451 7·728
Chlorine11·54 10·66
Suspended Matters
Mineral17·81 24·18
Organic21·30 20·51
Total39·11 44·69
In Grains per Gallon
Total Solid Matters in Solution57·68 50·54
Organic Carbon2·926 3·287
Organic Nitrogen1·382 1·543
Ammonia3·804 4·692
Total Combined Nitrogen4·515 5·410
Chlorine8·078 7·462
Suspended Matters
Mineral12·467 16·926
Organic14·910 14·357
Total27·377 31·283

This table being not unfrequently quoted in support of the contention that slops alone = slops + excrement, I may be excused if I examine it somewhat critically.

I will take the table in grains per gallon and simplify it somewhat.

Grains per Gallon

DescriptionTotal Solids in SolutionSuspended MatterTotal Solids in Solution and SuspensionOrganic CarbonAmmoniaTotal Combined NitrogenChlorine
MineralOrganic
Midden Towns57·68 12·467 14·910 85·057 2·926 3·804 4·515 8·078
Water-Closet Towns50·54 16·936 14·357 81·823 3·287 4·692 5·410 7·462
DescriptionMidden TownsWater-Closet Towns
Total Solids in Solution57·68 50·54
Suspended Matters
Mineral12·467 16·926
Organic14·910 14·357
Total Solids in Solution and Suspension85·057 81·823
Organic Carbon2·926 3·287
Ammonia3·804 4·692
Total Combined Nitrogen4·515 5·410
Chlorine8·078 7·462