Abstract: A micro-zone soil sampling apparatus and method for different contamination situations. The apparatus includes an uncovered cylinder and a plurality of circular separators. The circular separators are horizontally arranged in a hollow inner cavity of the uncovered cylinder, and are removably connected to an inner wall of the uncovered cylinder. Each circular separator includes a plurality of inner rings arranged coaxially, an outer ring coaxially arranged outside the inner rings, and a soil-bearing net. Each circular separator is divided into multiple hollow spaces by the inner rings and the outer ring. The inner rings made of a permeable membrane material and the outer ring made of a rigid material both have a certain thickness. The soil-bearing net is fittedly fixed on a bottom of each circular separator. A plurality of spokes passing through a center of the soil-bearing net are fixedly arranged on the soil-bearing net. A micro-zone soil sampling apparatus and method for different contamination situations.

Abstract: A high-concentration anaerobic fermentation apparatus includes a liquid accumulation tank, a fermentation vessel, a feeding assembly, and a biogas residue collecting bin. The feeding assembly includes a hopper and a return conveyor belt including a first portion extending downward from the hopper till below a liquid level, a second portion extending upward from a bottom end of the first portion till above the liquid level, a third portion extending downward from a top end of the second portion till the liquid level, and a fourth portion extending upward from a bottom end of the third portion till out of the liquid level and above the biogas residue collecting bin. A pressure-feed flange is disposed at an outer side of the fermentation vessel, a feed channel is formed between the pressure-feed flange and the first portion, and a discharge channel is formed between the pressure-feed flange and the fourth portion.