水质限制又称水污染物排放总量控制，是由水域水环境质量要求来限制污染物排放的水质管理方式。
其他投入或鱼的密度也要小心严格的限制，以避免破坏水质或者污染环境。
Other inputs and fish density are also carefully limited to avoid compromising water quality or degrading the environment.
由于落后的经济自然条件限制，如何妥善解决关于水资源短缺，水质安全保障和不发达的交通问题都是当务之急。
Due to the behindhand economic and natural limit, all the problems about water shortage, water quality safety and non-convenient transportation need be settled immediately.
但由于城市污水的水质很差、对换热设备污染严重等问题限制了城市污水低位冷热源的推广与应用。
But the application and popularization of city sewage cooling and heating source are limited because of the puzzle of bad quality of water, complex component and fouling of city sewage.
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