Читать книгу Natural & Artificial Sewage Treatment - H. Alfred Roechling - Страница 2

PREFACE.

I. INTRODUCTORY REMARKS.

II. THE SEWAGE QUESTION DURING THE LAST CENTURY.

III. THE SUBSOIL.

IV. SELF-PURIFYING POWERS OF SOIL. NATURAL SELF-PURIFICATION OF SEWAGE.

V. ARTIFICIAL SELF-PURIFICATION OF SEWAGE.