M. N. Musayev

Indirect discharge — Sewage from a non-domestic source of pollutants into amunici pal (often state-owned) wastewater treatment syssem. Indirect discharges can be of commercial or industrial facilities, which must pre­treat their wastes before discharge into the municipal sewers. Indirect discharges also may apply leachates, etc., from, for ehample, the waste deposal sites that contaminate underground waters.

Biogaz — sellulozalik anaerob organizmlar bilan metanli bijg'ish bakteriyalari ishtirokidagi organik chiqindilaming (go‘ng, somon, maishiy chiqindilar) parchalanishi jarayonida hosil bo'ladigan gazlar aralashmasi. B.ning taxminiy tarkibi: metan — 55-65 %, karbonat angidrid — 35-45 %, azot, vodorod, vodorod sulfid va b. gazlar aralashmasi. B.-dan yonilg'i sifatida foydalaniladi, axlatxonalarda u atmosferaning yer yuzi qatlamini iflloslantiradi va ko‘pmcha, yong‘inlar va portlashlarga sababchl bo‘ladi.